Updated on 2024/12/26

写真a

 
Michihiro Hara
 

Degree

  • Doctor (Engineering)   Coursework ( 2004.3   Osaka University )

Research Interests

  • cyclodextrin

  • laser chemistry

  • photochemistry

  • physical chemistry

Research Areas

  • Nanotechnology/Materials / Fundamental physical chemistry

  • Nanotechnology/Materials / Applied condensed matter physics

  • Others / Others

Education

  • Fukui University of Technology   Applied Physics and Chemistry   Graduated

    - 1998.3

  • Fukui University of Technology   Applied Physics and Chemistry Engineering   Master's Course   Completed

    1998.4 - 2000.3

  • Osaka University   Department of molecular chemistry   Doctor's Course   Accomplished credits for doctoral program

    2000.4 - 2003.3

  • Osaka University   Doctor's Course   Completed

    - 2004.3

Research History

  • The Institute of Scientific and Industrial Research (SANKEN), Osaka University   Educational staff of MEXT(1) Level 1

    2003.4 - 2004.3

  • The Institute of Scientific and Industrial Research (SANKEN), Osaka University   Technical assistant

    2004.4 - 2005.3

  • Fukui University of Technology   Lecturer

    2005.4 - 2008.3

  • Fukui University of Technology   Lecturer

    2005.4 - 2008.3

  • Fukui University of Technology   Associate Professor

    2008.4 - 2015.3

  • Fukui University of Technology   Associate Professor

    2008.4 - 2015.3

  • Fukui University of Technology   Professor

    2015.4 - 2020.3

  • Fukui University of Technology   Professor

    2015.4

  • Fukui University of Technology   Professor

    2020.4 - 2022.3

  • Fukui University of Technology   Professor

    2023.4

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Professional Memberships

  • The Japanese Photochemistry Association

    1998.9

  • Chemistry Society of Japan

    1998.11

  • The Spectroscopical Society of Japan

    2011.7

  • Japanese Society for Engineering Education

    2012.5

  • American Chemical Society

    2012.10

 

Papers

  • Fabrication and Characterization of Co-Sensitized Dye Solar Cells Using Energy Transfer from Spiropyran Derivatives to SQ2 Dye Reviewed International journal

    Michihiro Hara, Ryuhei Ejima

    Molecules   29 ( 20 )   4896   2024.10

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    We developed dye-sensitized solar cells (DSSCs) using 1,5-carboxy-2-[[3-[(2,3-dihydro-1,1-dimethyl-3-ethyl-1H-benzo[e]indol-2-ylidene)methyl]-2-hydroxy-4-oxo-2-cyclobuten-1-ylidene]methyl]-3,3-dimethyl-1-octyl-3H-indolium and 1,3,3-trimethyl indolino-6′-nitrobenzopyrylospiran. The DSSCs incorporate photochromic molecules to regulate photoelectric conversion properties. We irradiated photoelectrodes adsorbed with SQ2/SPNO2 using both UV and visible light and observed the color changes in these photoelectrodes. Following UV irradiation, the transmittance at 540 nm decreased by 20%, while it increased by 15% after visible light irradiation. This indicates that SPNO2 on the DSSCs is photoisomerized from the spiropyran form (SP) to the photomerocyanine (PMC) form under UV light. The photoelectric conversion efficiency (η) of the DSSCs increased by 0.15% following 5 min of UV irradiation and decreased by 0.07% after 5 min of visible light irradiation. However, direct electron injection from PMC seems challenging, suggesting that the mechanism for improved photoelectric conversion in these DSSCs is likely due to Förster resonance energy transfer (FRET) from PMC to the SQ2 dye. The findings suggest that the co-sensitization of DSSCs by PMC-SQ2 and SQ2 alone, facilitated by their respective photoabsorption, results in externally responsive and co-sensitized solar cells. This study provides valuable insights into the development of advanced DSSCs with externally controllable photoelectric conversion properties via the strategic use of photochromic molecules and energy transfer mechanisms, advancing future solar energy applications.

  • Diarylethene derivative photoionization control via two-color two-laser optical manipulation in the presence of cyclodextrins Reviewed International journal

    Michihiro Hara

    Optical Materials   154   115698   2024.6

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    In this study, the photodynamics of 1,2-bis(2,4-dimethyl-5-phenyl-3-thienyl)-3,3,4,4,5,5-hexafluoro-1-cyclopentene (DE) was investigated in the presence of α-, β- and γ-cyclodextrin (CD) inclusion complexes and under the influence of one- and two-laser excitations. Thus, this study aimed to elucidate the ionization quantum yield of DE and how it is affected by the type of CD and laser configuration. Specifically, DE/CD was flash photolyzed using a single laser (355 nm) or a double laser (355 nm and 532 nm) and observed at a wavelength of 720 nm to examine the transient absorption of hydrated electrons. The ionization efficiency with the two lasers was found to exceed that with the single laser. This suggests the existence of a two-step process involving S0→S1 and S1→Sn singlet transitions in the two-photon ionization (TPI) of DE. Furthermore, when the ring-closing isomer of DE was initiated via laser irradiation at 532 nm, the photoionization efficiency increased, especially in the presence of γ-CD. This implies that the 532-nm irradiation, which is not directly involved in TPI, contributed to promoting the TPI of DE, thus increasing its photo-steady state (saturation). Thus, the possibility of using CD-containing lasers to control photochemical reactions with photo-steady state processes was demonstrated. This investigation contributes to a broader understanding of the potential applications and underlying mechanisms of photochromic materials influenced by multi-laser interactions.

  • Fabrication and characterization ofsensitized dye solar cells - SQ2/CDs • SQ2/SPNO2 system­ Reviewed

    ( 54 )   85 - 96   2024.10

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    In this study, we report an investigation of the fabrication and characterization of SQ2-based film-type DSSCs (SQ2 devices), SQ2/CDs (α-CD, β-CD, γ-CD: CDs) devices and SQ2/SPNO2 devices. The fabricated SQ2 devices were irradiated at 655 nm and the photoelectric conversion property (IPCE655) was observed. The IPCE655 for SQ2 devices was 2.4%, and this value was also observed for SQ2/CDs film-type devices. The IPCE655 of the SQ2/γ-CD device was 3.2% and 30% larger than that of the SQ2 device. This suggests that γ-CD　suppressed the aggregation of SQ2 and increased IPCE655. The fabricated film-type SQ2/SPN02 devices was the IPCE655 were observed. The IPCE655 of the SQ2/SPN02 device was less than half that of the SQ2 device, but the IPCE655 increased by 40% with UV irradiation and decreased by about 40% with visible light irradiation. The increase of IPCE655 by UV irradiation suggests that PMC is involved in the photoelectric conversion ofSQ2.

  • Fabrication and Characterization of Firm type OLED Devices Containing Cyclodextrin Polymer Layers as Ecology devises -TPD/Alq3 System- Reviewed

    ( 54 )   97 - 104   2024.10

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    In this study, we present findings on the production and evaluation of organic light-emitting diode (OLED) devices featuring cyclodextrin polymer layers. These devices were composed of N, N-Bis(3-methylphenyl)-N, N-bis(phenyl)­ benzidine (TPD), cyclodextrin polymers (a-, -, y-CDP), Tris-(8-hydroxyquinoline) aluminum (A)q3), LiF, and Al, deposited onto ITO PEN films substrates. With CDP present, the OLEDs emitted green light due to the fluorescence of TPD and Alq3, achieving a peak brightness of3444 cd m-2. Our investigation suggests that the enlargement of the cavity size, weakening the encapsulation effect, facilitates the extraction of fluorescence. Moreover, we verified that the existence of CDP induces structural alterations at the interface, impacting the pathways of energy transfer during the excited state process of OLEDs. These discoveries offer significant insights into the design and potential applications of OLEDs, spanning various sectors including space technology and the evolving landscape of organic electronics.

  • Identification ofmalodorous substances emitted by bacteria isolated from the kendo protective gear warehouse and their effects on fungal growth

    Kimiko YABE, Michihiro HARA, Marni YAMAGUCHI, Takeyoshi SUNAGAWA, Tatsuya TAKESHITA , Shigehiro NISHIJIMA

    ( 54 )   72 - 80   2024.10

  • Elucidation ofthe bacteria related to malodors in the kendo protective gear warehouse and sterilization ofthe bacteria by X-rayirradiation as well as deodorization

    Kimiko YABE, Michihiro HARA, Marni YAMAGUCHI, Takeyoshi SUNAGAWA, Tatsuya TAKESHITA , Shigehiro NISHIJIMA

    ( 54 )   61 - 71   2024.10

  • Decomposition of Unpolarized Fluorescence Spectrum of Uniaxially Oriented 1,3,5-Triphenylbenzene Microcrystals Into Polarized Fluorescence Spectra Reviewed International journal

    Michihiro Hara, Tatsuya Takeshita, Hiroyuki Kurata, Tsunehisa Kimura

    Journal of Fluorescence   33   1559 - 1563   2023.2

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    Luminescence from solids such as crystals and aggregates is of growing academic and industrial interest. In this study, we report decomposition of the unpolarized fluorescence spectrum of uniaxially oriented 1,3,5-triphenylbenzene (TPB) microcrystals into four polarized spectra measured with polarizer (V: vertical and H: horizontal) and analyser (V: vertical and H: horizontal), where V and H indicate perpendicular and parallel to the layer of TPB molecules in the crystal, respectively. Resolved spectra were interpreted in terms of the molecular and excimer like (J- and H-dimer) emissions. The origin of the excimer like emissions was discussed in relation to the molecular packing in the crystal. It was shown that polarized crystal fluorescence can provide insight into the excitation/emission process in the crystal. Although preliminary, this study demonstrates the potential of polarized fluorescence to elucidate the luminescent mechanism.

  • Fabrication and Characterization of OLED Devices Containing Cyclodextrin Polymer Layers as Ecology devies-ｍ-MTDATA/PBD Sysytem- Reviewed

    ( 53 )   79 - 87   2023.10

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    In this study, we report an investigation of the fabrication and characterization of OLEDs containing cyclodextrin polymer layers. The OLEDs was fabrication by deposition of 4,4',4"-Tris[phenyl(m-tolyl)amino]triphenylamine (m-MTDATA), cyclodextrin polymer(CDP), 2-(4-tert-Biphenylyl)-5-(4-tert-butylphenyl)-l,3,4-oxadiazole (PBD), LiF, and Al on the ITO-glass. The OLEDs indicates the green emission, which is due to the fluorescence of m-MTDATA and PBD (exciplex) in the presence of CDP, and the highest luminance reached 1947 cd m-2 (Non). Our study revealed that the weakening of the inclusion effect, caused by an increase in cavity size, facilitates the extraction of exciplex emission. Moreover, we observed that the presence of CDP induces structural modifications at the interface, thereby affecting the energy transfer pathway during the excited state process in the OLEO. These findings provide important insights into the design of exciplex-based OLEDs and their potential applications in the field of organic electronics.

  • Two-photon ionization of cis-1,2-dicyano-1,2-bis-(2,4,5-trimethyl-3-thenyl)ethene in the presence of cyclodextrin by using 266-nm laser pulse irradiation

    Michihiro Hara, Naohiro Kawashima

    Memoirs of Fukui University of Technology   ( 52 )   55 - 62   2022.10

  • Fabrication and Characterisation of Organic EL Devices in the Presence of Cyclodextrin as an Interlayer Reviewed

    Michihiro Hara, Takao Umeda, Hiroyuki Kurata

    Sensors   21 ( 11 )   3666 - 3674   2021.5

  • Effect of cyclodextrin cavity size on the photovoltaic performance of unanchored ruthenium(II) polypyridine complex-containing dye-sensitized solar cells(査読有) Reviewed

    Michihiro Hara, Tatsuya Takeshita, Takao Umeda

    Journal of Photonics for Energy   10 ( 4 )   045503   2020.11

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    シクロデキストリン層を含むポルフィリン色素を用いた色素増感太陽電池の作製と評価

  • Photoionization and trans-to-cis isomerization of β-cyclodextrin-encapsulated azobenzene induced by two-color two-laser-pulse excitation Reviewed

    Tatsuya Takeshita, Michihiro Hara

    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy   193 ( 15 )   475 - 479   2018.3

  • Light-Driven Proton Release of Spirobenzopyran-Derived Protonated Photomerocyanine in Cyclodextrin Aqueous Solution Reviewed

    Tatsuya Takeshita, Atsushi Yano, Michihiro Hara

    ChemistrySELECT   2 ( 34 )   11288 - 11292   2017.12

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    Protonated photomerocyanine (PMCH), which is a ring-opening isomer of spirobenzopyran, functions as a metastable-state photoacid (PAH) driven by blue or visible light. Enhancement of the proton photodissociation efficiency and thermal stability of the deprotonated isomer facilitates pH adjustments and control by light irradiation. In this article, we report the proton photodissociation of PMCH based on 1,3,3-trimethylindolino-8’-methoxybenzopyrylospiran (1) in an aqueous cyclodextrin (CD) solution. In the aqueous solution, the spirobenzopyran form of 1 underwent a spontaneous ring-opening reaction and formed the thermodynamically stable PMCH form of 1 (PMCH-1). After a laser flash at 355 nm, the photomerocyanine form of 1 (PMC-1) was generated by proton photodissociation from the singlet excited state of PMCH-1. The quantum yield of the proton photodissociation was changed by the stoichiometry or binding constant of the inclusion complex between PMCH-1 and CD. Additionally, the encapsulation effects of CD inhibited the re-protonation of PMC-1. We conclude that these findings are useful for pH adjustment and control using PAHs based on PMCH.

  • Improvement of photoionization efficiency of diarylethene-cyclodextrin complexes by using multi-laser pulse excitation(査読あり) Reviewed

    Tatsuya Takeshita, Hiroyuki Kurata, Michihiro Hara

    Journal of Photochemistry and Photobiology A: Chemistry   344   28 - 35   2017.4

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    マルチレーザー照射によるシクロデキストリン共存下でのジアリールエテンの２光子イオン化の論文であり、３つのレーザーを使った光操作の素子へ応用にも利用できることも示した。

  • Fabrication of a dye-sensitized solar cell containing a noncarboxylated spiropyran-derived photomerocyanine with cyclodextrin Reviewed

    Tatsuya Takeshita, Takao Umeda, Michihiro Hara

    Journal of Photochemistry and Photobiology A: Chemistry   333   87 - 91   2017.1

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    The fabrication, photovoltaic conversion, and photo-response of dye-sensitized solar cell (DSSC) containing a noncarboxylated spiropyran 1,3,3-trimethylindolino-β-naphthopyrylospiran (1) and carboxymethyl-β-cyclodextrin sodium salt (CM-β-CD) were investigated for the first time. In fact, we found the adsorption of photomerocyanine form (PMC) of 1 and inclusion complexes between the PMC and CM-β-CD (PMC/CM-β-CD) to the TiO2 surface. The formation of PMC/CM-β-CD was confirmed by fluorescence spectroscopy. The incident photon-to-current conversion efficiency (IPCE) of the PMC-containing DSSC obtained 4.1% under 570-nm light irradiation, and the highest IPCE reached 11.1% by inclusion effect of CM-β-CD. Similar, the fillfactor and the open-circuit voltage were improved by CM-β-CD layer. The IPCE value of PMC/CM-β-CD-containing DSSC was decreased by visible light treatment, and it was considered that decrease of IPCE values are attributed to the formation of PMC isomer. Therefore, we demonstrated the photovoltaic conversion and photoresponsivity of the DSSC by incorporating a noncarboxylated PMC with inclusion effect of CM-β-CD layer.

  • Resonant two-photon ionization of aromatic hydrocarbons included in cyclodextrins(査読有) Reviewed

    Tatsuya Takeshita, Yuuta Kasaba, Michihiro Hara

    Journal of Photochemistry and Photobiology A: Chemistry   321   128 - 136   2016.5

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    シクロデキストリン共存下での直鎖芳香族炭化水素の2光子イオン化を系統だって検討した報告である。

  • Application of a Noncarboxylated Dye Compound in a Dye-Sensitized Solar Cell Containing a Cyclodextrin Layer(査読有) Reviewed

    Tatsuya Takeshita, Takao Umeda, Noriaki Oonishi, Michihiro Hara

    International Journal of Photoenergy   Article ID 786246   2015.5

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    シクロデキストリンを用いた色素増感太陽電池の検討を行った。シクロデキストリンを用いることで、使用できる色素の種類を格段に増やすことができることを示した。

  • Resonance photoionization of a diarylethene derivative in the presence of cyclodextrins using multi-color multi-laser irradiation(査読有） Reviewed

    Tatsuya Takeshita, Michihiro Hara

    Journal of Photochemistry and Photobiology A: Chemistry   ( 310 )   180 - 188   2015.5

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    シクロデキストリン共存下でのジアリールエテンに対して、多色多レーザー照射による光イオン化とその制御を検討し、光制御できる可能性を示した。

  • Resonance Two-Photon Ionization of Diarylethene in the Presence of Cyclodextrin（査読付き） Reviewed

    Michihiro Hara, Makoto Miwa, Tatsuya Takeshita, Shouhei Watanabe

    International Journal of Photoenergy   2013 ( 2013 )   2013.8

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    フォトクロミック分子として注目されているジアリールエテン誘導体に対して、シクロデキストリン共存下高強度レーザーパルス光を照射による、2光子イオン化し、シクロデキストリンの差によって2光子イオン化の過程に影響があることを示した。本該当者は本論文の中に、行われた測定システムの構築をはじめ、その獲得したデータをもとに、他の著者らと議論等を行った。

  • Laser Two-photon Ionization of Spiropiran in the Presence of Cyclodextrin

    Michihiro HARA, Tomoyuki OOI

    Memoirs of Fukui University of Technology   ( 41 )   375 - 380   2011.6

  • Laser Two-photon Ionization of Naphthalene in the presence of Cyclodextrins

    Michihiro HARA, Hirohisa KAMADA

    Memoirs of Fukui University of Technology   ( 41 )   369 - 374   2011.6

  • The Effect of p-Type Doping on the Performance of Organic Thin-Film Photovoltaic Devices ? m-MTDATA/C60 and 2-TNATA/C60 Systems（査読付き） Reviewed

    Takao Umeda,Keigo Chujo,Yasuhiro Nomura,Kotaro Tsuchida,Michihiro Hara, Sayo Terashima,Yasuhiro Koji,Hiroshi Kageyama,Yasuhiko Shirota

    Journal of Photonics for Energy   1   011113-1 - 011113-11   2011.3

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    有機薄膜太陽電池を作製し、その評価を行った。M-MTDATA/C60と2-TNATA/C60系において、p型ドーピングの効果について報告。

  • Laser Two-photon Ionization of 4-(dimethylamino)benzonitrile in the presence of Cyclodextrins

    ( 39 )   249 - 256   2009.8

  • Fabrication and Performance of Multilayer Organic Electroluminescent Device : Exciplex Emission

    ( 38 )   249 - 256   2008.5

  • Laser Two-photon lonization of N-Phenylglycine in the Presence of Cyclodextrins

    ( 38 )   229 - 234   2008.5

  • Two-Photon ionization of Diphenyl disulfide using Two-color Two-Laser pulses

    ( 37 )   255 - 260   2007.5

  • Risk managing consideration to sea-level rise due to global warming based on regional sustainability

    ( 37 )   131 - 138   2007.5

  • Model study on the function exertion of phyto chemicals (1)

    ( 37 )   261 - 264   2007.5

  • Importance of Properties of the Lowest and Higher Singlet Excited States on the Resonant Two-Photon Ionization of Stilbene and Substituted Stilbenes Using Two-Color Two-Lasers（査読付き） Reviewed

    Michihiro Hara, Shingo Samori, Xichen Cai, Mamoru Fujitsuka, Tetsuro Majima

    The Journal of Physical Chemistry A   109 ( 43 )   9831 - 9835   2005.10

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    アセトニトリル中、1レーザー（266-,　355-nm）と2レーザー（266-と532-nm,　355-と532-nm）の2光子イオン化によるスチルベンとスチルベン誘導体のラジカルカチオンの研究。

  • Efficient Emission from Charge Recombination during the Pulse Radiolysis of Electrochemical Luminescent Substituted Quinolines with Donor-Acceptor Character（査読付き） Reviewed

    Shingo Samori, Michihiro Hara, Sachiko Tojo, Mamoru Fujitsuka, Shu-Wen Yang,Arumugasamy Elangovan, Tong-Ing Ho, Tetsuro Majima

    The Journal of Physical Chemistry B   109 ( 23 )   11735 - 11742   2005.5

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    パルスラジオリシス法を用いて、ベンゼン中時間分解蛍光測定を行い、エチニルリンカーのドナーアクセプターキノリンからの発光の研究。

  • Significant Effects of Substituents on Substituted Naphthalenes in the Higher Triplet Excited State（査読付き） Reviewed

    Masanori Sakamoto, Xichen Cai, Michihiro Hara, Mamoru Fujitsuka, Tetsuro Majima

    The Journal of Physical Chemistry A   109 ( 21 )   4657 - 4661   2005.5

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    二色―二レーザーを用いた高励起三重項状態におけるナフタレン誘導体の寿命における置換効果の研究。

  • Homolytic cleavage of C-Si bond of p-trimethylsilylmethylacetophenone upon stepwise two-photon excitation using two-color two-laser flash photolysis（査読付き） Reviewed

    Xichen Cai, Masanori Sakamoto, Michihiro Hara, Susumu Inomata, Minoru Yamaji, Sachiko Tojo, Kiyohiko Kawai, Masayuki Endo, Mamoru Fujitsuka, Tetsuro Majima

    Chemical Physics Letters   407 ( 4-6 )   402 - 406   2005.4

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    ２色―２レーザーを用いた高励起三重項状態におけるp－trimethylsilylmethyl　acetophenoneのC-Si結合解裂の研究。

  • Formation of Highly Stabilized Intramolecular Dimer Radical Cation and π -Complex of [3n]Cyclophanes (n = 3, 5, 6) during Pulse Radiolysis（査読付き） Reviewed

    Mamoru Fujitsuka, Shingo Samori,Michihiro Hara, Sachiko Tojo, Satoko Yamashiro, Teruo Shinmyozu, Tetsuro Majima

    The Journal of Physical Chemistry A   109 ( 16 )   3531 - 3534   2005.4

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    パルスラジオリシス法を用いたシクロファンのラジカルカチオン生成と電荷移動の研究。

  • Stepwise Photocleavage of C-O Bonds of Bis(substituted-methyl)naphthalenes with Stepwise Excitation by Two-Color Two-Laser and Three-Color Three-Laser Irradiations（査読付き） Reviewed

    Xichen Cai, Masanori Sakamoto, Michihiro Hara, Sachiko Tojo, Akihiko Ouchi, Akira Sugimoto, Kiyohiko Kawai, Masayuki Endo, Mamoru Fujitsuka, Tetsuro Majima

    The Journal of Physical Chemistry A   109 ( 17 )   3797 - 3802   2005.4

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    室温中、2色－2レーザーまたは3色－3レーザーを用いて、 mono(substituted-methyl)　naphthalenesのC-O結合のステップワイズ光解離と bis(substituted-methyl)naphthalenesの研究を行い、二段階および三段階励起により約100%でナフチルメチルラジカルを得た。

  • Effect of Oxygen on the Formation and Decay of Stilbene Radical Cation during the Resonant Two-Photon Ionization（査読付き） Reviewed

    Michihiro Hara, Shingo Samori, Cai Xichen, Mamoru Fujitsuka, Tetsuro Majima

    The Journal of Organic Chemistry   70 ( 11 )   4370 - 4374   2005.4

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    酸素存在下および非存在下でのアセトニトリル中のトランススチルベンおよびパラ置換スチルベンの2光子共鳴イオン化による形成と減衰の研究。

  • Photophysical Properties of Oligo(2,3-　Thienyleneethynylene)s（査読付き） Reviewed

    Yosuke Oseki, Mamoru Fujitsuka, Michihiro Hara, Xichen Cai, Yutaka Ie, Yoshio Aso, Tetsuro Majima

    The Journal of Physical Chemistry B   109 ( 21 )   10695 - 10698   2005.4

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    時間分解蛍光および過渡吸収スペクトルを用いた、ベンゼン中 oligo(2,3-thienylene　ethynylene)の光物性の研究。

  • Dihydrophenanthrene-Type Intermediates during Photoreaction of trans-4'-Benzyl-5-styrylfuran（査読付き） Reviewed

    Shingo Samori,Michihiro Hara, Tong-Ing Ho, Sachiko Tojo, Kiyohiko Kawai, Masayuki Endo, Mamoru Fujitsuka, Tetsuro Majima

    The Journal of Organic Chemistry   70 ( 7 )   2708 - 2712   2005.3

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    ピコ秒およびナノ秒の355-nmYAGレーザーを用いた塩化メチレン中のtrans-4'-benzyl-5-styrylfuranの光反応の研究。

  • Anomalous Fluorescence from the Azaxanthone Ketyl Radical in the Excited State（査読付き） Reviewed

    Masanori Sakamoto, Xichen Cai, Michihiro Hara, Sachiko Tojo, Mamoru Fujitsuka, Tetsuro Majima

    Journal of the American Chemical Society   127 ( 11 )   3702 - 3703   2005.2

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    ナノ秒―ピコ秒２色―２レーザーフラッシュホトリシスを用いたアザキサントンケチルラジカルの時間分解吸収や蛍光スペクトルの研究。

  • Remarkable Reactivities of the Xanthone Ketyl Radical in the Excited State Compared with That in the Ground State（査読付き） Reviewed

    Masanori Sakamoto, Xichen Cai, Michihiro Hara, Mamoru Fujitsuka, Tetsuro Majima

    The Journal of Physical Chemistry A   109 ( 11 )   2452 - 2458   2005.2

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    2色―2レーザーフラッシュホトリシスを用いた、ダブレット励起状態でのキサントンケチルラジカルの反応性と物性の研究。

  • Inhibition of the Formation and Decay of Stilbene Core Radical Cations by the Dendron during the Photoinduced Electron Transfer（査読付き） Reviewed

    Michihiro Hara, Shingo Samori, Xichen Cai, Sachiko Tojo, Tatsuo Arai, Atsuya Momotake, Junpei Hayakawa, Mayuko Uda, Kiyohiko Kawai, Masayuki Endo, Mamoru Fujitsuka, Tetsuro Majima

    The Journal of Physical Chemistry B   109 ( 2 )   973 - 976   2005.1

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    パルスラジオリシス法を用いて、ベンゼン中時間分解蛍光測定を行い、エチニルリンカーのドナーアクセプターキノリンからの発光の研究。

  • Fast Exciton Migration in Porphyrin-Functionalized Polypeptides（査読付き） Reviewed

    Mamoru Fujitsuka, Michihiro Hara, Sachiko Tojo, Ayumi Okada, Vincent Troiani, Nathalie Solladie, Tetsuro Majima

    The Journal of Physical Chemistry B   109 ( 1 )   33 - 35   2005.1

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    ポルフィリンを有するポリペプチドの光物性の研究。分子内エキシトンーエキシトン、アニヒレーションは効率的に励起一重項状態のポルフィリンを経てエキシト移動を生じた。そのエキシトンの速度はポリマー重合度に依存した。

  • Effects of Benzyl Ether Type Dendrons as Hole-Harvesting Antennas, and Shielding for the Neutralization of Stilbene Core Radical Cations with Chloride Ion during Two-Photon Ionization of Stilbene Dendrimers Having Stilbene Core and Benzyl Ether Type Dendrons（査読付き） Reviewed

    Michihiro Hara, Shingo Samori, Xichen Cai, Sachiko Tojo, Tatsuo Arai, Atsuya Momotake, Junpei Hayakawa, Mayuko Uda, Kiyohiko Kawai, Masayuki Endo, Mamoru Fujitsuka, Tetsuro Majima

    Journal of the American Chemical Society   126 ( 43 )   14217 - 14223   2004.10

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    スチルベンデンドリマーの二光子イオン化（266-nm, 308-nm）のデンドリマー効果を報告した研究論文。

  • Competitive Marcus-Type Electron Transfer and Energy Transfer from the Higher Triplet Excited State（査読付き） Reviewed

    Masanori Sakamoto, Xichen Cai, Michihiro Hara, Sachiko Tojo, Mamoru Fujitsuka, Tetsuro Majima

    The Journal of Physical Chemistry A   108 ( 50 )   10941 - 10948   2004.9

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    ナフタレン誘導体とクロロベンゼン誘導体との高励起三重項状態からのエネルギー移動および電子移動を報告している。

  • Rate Constant of Bimolecular Triplet Energy Transfer from Chrysene in the Higher Triplet Excited States（査読付き） Reviewed

    Xichen Cai, Masanori Sakamoto, Michihiro Hara, Sachiko Tojo, Kiyohiko Kawai, Masayuki Endo, Mamoru Fujitsuka, Tetsuro Majima

    The Journal of Physical Chemistry A   108 ( 35 )   7147 - 7150   2004.8

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    高励起3重項状態のクリセンからbiphenyl, naphthaleneへのエネルギー移動の速度定数を検討した研究論文。

  • First Direct Observation of the Higher Triplet Excited State of Substituted Oligothiophenes by Two-color Two-laser Flash Photolysis（査読付き） Reviewed

    Mamoru Fujitsuka, Yosuke Oseki, Michihiro Hara, Xichen Cai, Akira Sugimoto, Tetsuro Majima

    ChemPhysChem   5 ( 8 )   1240 - 1242   2004.8

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    ナノ秒およびピコ秒レーザーを用いた二色二レーザーによる、オリゴチオフェン（三量体、四量体、五量体）の高励起三重項状態の研究。初めて、直接、高励起三重項状態を観測した。

  • Transient Phenomena of Polyphenyls in the Higher Triplet Excited State（査読付き） Reviewed

    Xichen Cai, Masanori Sakamoto, Michihiro Hara, Sachiko Tojo, Kiyohiko Kawai, Masayuki Endo, Mamoru Fujitsuka, Tetsuro Majima

    The Journal of Physical Chemistry A   108 ( 43 )   9361 - 9364   2004.8

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    ポリフェニル（biphenyl, p-terphenyl, と 1,3,5-triphenylbenzene）の高励起三重項状態性質をns-ps2色2-レーザーフラッシュホトリシスを用いて検討した研究論文。

  • Transient Absorption Spectra and Lifetimes of Benzophenone Ketyl Radicals in the Excited State（査読付き） Reviewed

    Masanori Sakamoto, Xichen Cai, Michihiro Hara, Sachiko Tojo, Mamoru Fujitsuka, Tetsuro Majima

    The Journal of Physical Chemistry A   108 ( 40 )   8147 - 8150   2004.8

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    ベンゾフェノン誘導体の各化合物のケチルラジカルを生成し、その励起状態などの光学物性をns-ps2色2-レーザーフラッシュホトリシスを用いて検討した研究論文。

  • Higher Triplet Excited States of Oligo(p-phenylenevinylene)s（査読付き） Reviewed

    Yosuke Oseki, Mamoru Fujitsuka, Michihiro Hara, Xichen Cai, Akira Sugimoto, Tetsuro Majima

    The Journal of Physical Chemistry A   108 ( 43 )   16727 - 16731   2004.8

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    oligo(p-phenylenevinylene)誘導体の高励起三重項状態性質をns-ps2色2-レーザーフラッシュホトリシスを用い検討した研究論文。

  • Intermolecular electron transfer from naphthalene derivatives in the higher triplet excited states（査読付き） Reviewed

    Masanori Sakamoto, Xichen Cai, Michihiro Hara, Mamoru Fujitsuka, Tetsuro Majima

    Journal of the American Chemical Society   126 ( 31 )   9709 - 9714   2004.6

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    二色ニレーザーを用いたナフタレン誘導体（Np）の高励起三重項状態（Tn）の研究。NpのTnからCCl4への分子間電子移動が観測され、その現象はCCl4への一電子還元付着を基本とした解裂型電子移動であることを示した。

  • Formation and Decay of Pyrene Radical Cation and Pyrene Dimer Radical Cation in the Absence and Presence of Cyclodextrins during Resonant Two－Photon Ionization of Pyrene and Sodium 1-Pyrene Sulfonate（査読付き） Reviewed

    Michihiro Hara, Sachiko Tojo, Kiyohiko Kawai, Tetsuro Majima

    Physical Chemistry Chemical Physics   6 ( 13 )   3215 - 3220   2004.6

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    ピレンおよびピレンスルホン酸（PySA）のシクロデキストリン（CD）共存下における共鳴二光子イオン化（TPI）の研究。CD中のPySAはTPIによりラジカルカチオンになり、またPySAとそのラジカルカチオンによりダイマーラジカルカチオンが生成した。そのダイマーラジカルカチオンは分光学的に得られた情報からCDの違いにより生じる形態の違いが観測され、その動的挙動を観測した。

  • Relationship between formation yield of radical cation and laser intensity during resonant two-photon ionization of stibene and methoxyl-substituted stilbenes using a 25-ns XeCl excimer laser（査読付き） Reviewed

    Michihiro Hara Sachiko Tojo, Mamoru Fujitsuka, Tetsuro Majima

    Chemical Physics Letters   393 ( 4-6 )   338 - 342   2004.6

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    スチルベンおよびスチルベン誘導体の共鳴二光子イオン化（TPI）の研究。TPIのメカニズムを過渡吸光度法と光定常状態法を用いて、イオン化収率とレーザー強度の依存性を明らかにし、TPIのメカニズムを明らかにした。

  • Stepwise Photocleavage of C-O bonds of 1,8-bis[(4-benzoylphenoxy)-methyl]naphthalene One by One with Three-step Excitation by Three-color Three-laser Irradiation（査読付き） Reviewed

    Xichen Cai, Masanori Sakamoto, Michihiro Hara, Sachiko Tojo, Akihiko Ouchi, Kiyohiko Kawai, Masayuki Endo, Mamoru Fujitsuka, Tetsuro Majima

    Journal of the American Chemical Society   126 ( 24 )   7432 - 7433   2004.6

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    三色三レーザーを用い、1,8-bis[(4-benzoyl　phenoxy)methyl]naphthaleneの２つの naphthylmethyl-oxygen結合の段階的光解裂の研究。第一レーザーは励起三重項状態（T1）を生成し、第二レーザーはそのT1を励起し、C-O結合が一つ外れ、第三レーザーにより、生じたラジカルを励起し、もう片方（二個目）のC-O結合を解裂させた。

  • Quenching processes of aromatic hydrocarbons in the higher triplet excited states-energy transfer vs. electron transfer（査読付き） Reviewed

    Xichen Cai, Masanori Sakamoto,Michihiro Hara, Sachiko Tojo, Kiyohiko Kawai, Masayuki Endo, Mamoru Fujitsuka and Tetsuro Majima

    Physical Chemistry Chemical Physics   6 ( 8 )   1735 - 1741   2004.4

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    二色ニレーザーを用いた芳香族炭化水素化合物の高励起三重項状態（Tn）の研究。 Tnの寿命を求めるとともに、 Tnからのエネルギー移動と電子移動を検討した。

  • Photochemistry of halogenated anilines studied by time-variation of microwave dielectric absorption（査読付き） Reviewed

    Michihiro Hara, Takeyoshi Sunagawa, Yosuke Oseki, Tetsuro Majima

    Journal of Photochemistry and Photobiology, A: Chemistry   163 ( 1-2 )   153 - 158   2004.4

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    マイクロ波誘電吸収法を用い、p-クロロアニリン（CA）、 p-ブロモアニリン（BA）、 p-ヨードアニリン（IA）の光化学の研究。CAはイオン対の性質を持つ励起三重項状態を示し、BAは光均一解裂によりp-aminophenyl radical とBrアニオンとのイオン対を示し、IAは p-aminophenyl radicalを示した。

  • Inhibition of one-electron oxidation of 1-pyrenesulfonate included in cyclodextrin by sulfate radical anion（査読付き） Reviewed

    Michihiro Hara, Sachiko Tojo, Tetsuro Majima

    Chemical Physics Letters   387 ( 4-6 )   283 - 286   2004.4

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    パルスラジオリシスを用い、シクロデキストリン（CD）中のsulfateラジカルアニオンによるピレンスルホン酸の一電子酸化の研究。βCDやγCDの籠効果により抑制された酸化反応を観測した。

  • Multi-Photon and Multi-Laser Chemistry of Aromatic Compounds(博士論文)

    Michihiro HARA

    2004.3

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    各種芳香族化合物に対して、多光子およびマルチレーザーを適応した光化学反応について述べたものである。本論文は多光子励起および多段階励起による芳香族化合物の光化学反応を述べたものである。

  • Formation efficiency of radical cations of stilbene and methoxy-　substituted stilbenes during resonant two-photon ionization with a XeCl excimer laser （査読付き） Reviewed

    Michihiro Hara, Sachiko Tojo, Tetsuro Majima

    Journal of Photochemistry and Photobiology, A: Chemistry   162 ( 1 )   121 - 128   2004.2

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    スチルベンやメトキシスチルベン誘導体の共鳴二光子イオン化（TPI）の研究。TPIの収率が酸化電位よりもその寿命に依存することを見いだし、励起状態で分子内電荷移動の作用がTPIに影響していることを示した。

  • Benzophenones in the higher triplet excited states（査読付き） Reviewed

    Xichen Cai, Masanori Sakamoto,Michihiro Hara, Akira Sugimoto, Sachiko Tojo, Kiyohiko Kawai, Masayuki Endo, Mamoru Fujitsuka, Tetsuro Majima

    Photochemical & Photobiological Sciences   2 ( 11 )   1209 - 1214   2003.10

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    二色ニレーザーフラッシュホトリシスを用いたベンゾフェノンとその誘導体の高励起三重項状態（Tn）の研究。消光剤にp-ジクロロベンゼンやo-ジシアノベンゼンを用いたとき、エネルギー移動が観測され、CCl4を用いたときはCCl4が均一解裂し、ラジカルが生成することを示した。

  • Rapid cleavage of the naphthylmethyl-oxygen bond in higher triplet excited states（査読付き） Reviewed

    Xichen Cai, Masanori Sakamoto,Michihiro Hara, Sachiko Tojo, Mamoru Fujitsuka, Akihiko Ouchi, Tetsuro Majima

    Chemical Communications (Cambridge, United Kingdom)   ( 2 )   2604 - 2605   2003.9

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    1-または2-[(4-benzoylphenoxy)methyl]　naphthaleneのnaphthylmethyloxygen結合の高励起三重項状態からの解離の研究。1-naphthylmethylラジカルと2- naphthylmethylラジカルの量子収率、0.042と0.02を示した。本該当者は本論文の中に、行われた測定システムの構築をはじめ、その獲得したデータをにもとに、他の著者らと議論等を行った。

  • Some triplet energy-transfer re　actions initiated by photo-excitation of triplet excited state of dibenz[a,h]anthracene to the higher triplet excited states（査読付き） Reviewed

    Xichen Cai, Michihiro Hara, Kiyohiko Kawai, Sachiko Tojo, Mamoru Fujitsuka, Tetsuro Majima

    Tetrahedron Letters   44 ( 32 )   6117 - 6120   2003.8

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    二色ニレーザーフラッシュホトリシスを用いたdibenz[a,h]anthraceneの高励起三重項状態（Tn）の研究。消光剤にナフタレン、ビフェニル、p-ジクロロベンゼンやo-ジシアノベンゼンのときにエネルギー移動を観測し、四塩化炭素のときは分解を観測した。

  • Three-color Three- Laser Photochemistry of Di(p-methxyphenyl）methyl Chloride（査読付き） Reviewed

    Michihiro Hara, Sachiko Tojo, Tetsuro Majima

    The Journal of Physical Chemistry A   107 ( 24 )   4778 - 4783   2003.5

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    Di(p-methoxyphenyl) methyl chlorideの三色三レーザー光化学の研究。第一レーザーによりラジカルを生成し、そのラジカルに第二レーザーを照射し、二光子イオン化を経て、カチオンを生成。そのカチオンに第三レーザーを照射し、カチオンの発光を観測した。そのとき、第二レーザーの有無により、蛍光強度を変化させ、濃度変化による化学反応のレーザー制御を示した。

  • Sensitized reactions by　Benzophenone in the Higher Triplet Excited State（査読付き） Reviewed

    Xichen Cai, Michihiro Hara, Kiyohiko Kawai, Sachiko Tojo, Tetsuro Majima

    Chemical Physics Letters   371 ( 1-2 )   68 - 73   2003.3

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    二色ニレーザーフラッシュホトリシスを用いたベンゾフェノンとその誘導体の高励起三重項状態（Tn）の研究。消光剤の濃度変化と消光効率の関係から高励起三重項状態の寿命450 psを算出し、また、Tnからの結合解離を観測した。

  • Naphthalene in the higher triplet excited state （査読付き） Reviewed

    Xichen Cai,Michihiro Hara, Kiyohiko Kawai, Sachiko Tojo and Tetsuro Majima

    Chemical Communications (Cambridge, United Kingdom)   ( 2 )   222 - 223   2003.1

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    二色ニレーザーフラッシュホトリシスを用いたナフタレンの高励起三重項状態の研究。消光剤にp-ジクロロベンゼンや四塩化炭素を用いて、その濃度変化と消光効率の変化から光励起三重項状態の寿命4.5 psを算出した。

  • Properties of chrysene in the higher triplet excited state （査読付き） Reviewed

    Xichen Cai, Michihiro Hara, Kiyohiko Kawai, Sachiko Tojo, Tetsuro Majima

    Chemical Physics Letters   368 ( 3-4 )   365 - 369   2003.1

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    二色ニレーザーフラッシュホトリシスを用いたクリセンの高励起三重項状態の研究。消光剤にビフェニルやナフタレンを用いて、その濃度変化と消光効率の変化から高励起三重項状態の寿命60 psを算出した。

  • On the Electronic Character of Localized Singlet 2,2-Dimethoxy　cyclopentane-1,3-diyl Diradicals: Substituent Effects on the Lifetime （査読付き） Reviewed

    Manabu Abe, Waldemar Adam, Michihiro Hara, Masanori Hattori, Tetsuro Majima, Masatomo Nojima, Kei Tachibana, Sachiko Tojo

    Journal of the American Chemical Society   124 ( 14 )   6540 - 6541   2002.5

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    diazeneの光脱窒素におけるhousane生成の研究。過渡吸収測定により、シングレットジラジカルの寿命がフェニルリングのパラ位の置換基に依存することを見出した。この新しい置換基効果はラジカル、ツビッターイオン、π―結合、超共役構造によるシングレット2,2-dimethoxycyclopentane-1,3-diyldiradicalsの安定性に起因することを示した。

  • Regulation of one-electron oxidation rate of guanine by base pairing with cytosine derivatives （査読付き） Reviewed

    Kiyohiko kawai, Yasuharu Wata,Michihiro Hara,Sachiko Tojo, Tetsuro Majima

    Journal of the American Chemical Society   124 ( 14 )   3586 - 3590   2002.3

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    グアニン誘導体の一電子酸化速度の塩基対効果の研究。グアニン誘導体の一電子酸化速度は酸化剤（フラーレンやN,N’-dibutylnaphthaldiimide）を利用した、励起三重項消光実験によって決定された。この結果DNA中のグアニンの一電子酸化速度がシトシン誘導体との塩基対において、影響をうけることを示した。

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Teaching Experience

  • Advanced Physical Chemistry

    Institution：Fukui University of Technology

  • Seminar on Environmental and Biological Chemistry

    Institution：Fukui University of Technology

  • Advanced Experiments on Environmental and Biological Chemistry

    Institution：Fukui University of Technology

  • Introduction of Environmental and Information Sciences

    Institution：Fukui University of Technology

  • Base of Environmental and Information Sciences Exercise

    Institution：Fukui University of Technology

  • Environmental and Information Sciences Exercise I

    Institution：Fukui University of Technology

  • Environmental and Information Sciences Exercise II

    Institution：Fukui University of Technology

  • Environmental and Information Sciences Exercise III

    Institution：Fukui University of Technology

  • Introduction of Environmental and Food Chemistry

    Institution：Fukui University of Technology

  • Basic Laboratory Experiments I

    Institution：Fukui University of Technology

  • Basic Laboratory Experiments II

    Institution：Fukui University of Technology

  • Physical Chemistry I

    Institution：Fukui University of Technology

  • Physical Chemistry II

    Institution：Fukui University of Technology

  • Laboratory Experiments I

    Institution：Fukui University of Technology

  • Laboratory Experiments III

    Institution：Fukui University of Technology

  • Laboratory Experiments IV

    Institution：Fukui University of Technology

  • Physical Chemistry Exercise

    Institution：Fukui University of Technology

  • Career Seminar II

    Institution：Fukui University of Technology

  • Career Seminar IV

    Institution：Fukui University of Technology

  • Theme Study

    Institution：Fukui University of Technology

  • Research for Graduation

    Institution：Fukui University of Technology

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