Recent papers

  1. "Orthogonal and twisted dimers of redox-active pyrrole-fused pentaazapolycyclic hydrocarbons" Tomoyuki Narita, Kazuki Fujiwara, Hidemitsu Uno, Motoko S. Asano, Tohru Nishinaga, and Masayoshi Takase*, J. Porphyrins Phthalocyanine,in press.

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  2. "Electronic Relaxation and Spin-Spin Coupling in the Photoexcited States of Paramagnetic Metal Complexes and Their Composite Systems" Motoko S. Asano, Electron Spin Science and Technology, 21, 4-11 (2023)

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  3. "Recent Developments of Photoactive Cu(I) and Ag(I) Complexes with Diphosphine and Related Ligands" Hiroyuki Takeda, Atsushi Kobayashi, Kiyoshi Tsuge, Coord. Chem. Rev., 470, 214700 (2022)

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  4. "Star-Shaped ROMP Polymers Coated with Oligothiophenes that Exhibit Unique Emission" Zelin Sun, Ken Kobori, Kotohiro Nomura*, Motoko S. Asano*, ACS Omega, 7, in press (2022) [https://doi.org/10.1021/acsomega.2c00739]

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  5. "Heteroleptic Cu(I) Phenanthroline Complexes Bearing Benzoxazole and Benzothiazole Moieties for Visible Light Absorption" Hiroyuki Takeda,* Makoto Shimo, Gai Yasuhara, Ken Kobori, Motoko S. Asano, Yutaka Amao, Chem. Lett., 51, 69-72 (2022） [http://dx.doi.org/10.1021/acs.jpcb.0c09613]

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  6. "Highly Functional Dinuclear CuI-Complex Photosensitizers for Photocatalytic CO2 Reduction" Hiroyuki Takeda*, Yu Monma, and Osamu Ishitani* ACS Catal. 11, 11973-11984 (2021） [https://doi.org/10.1021/acscatal.1c03336]

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  7. "S,C,C- and O,C,C-Bridged Triarylamines and Their Persistent Radical Cations" Shunpei Kataoka, Shuichi Suzuki, Yoshihito Shiota, Kazunari Yoshizawa, Taisuke Matsumoto, Motoko S. Asano, Toshitada Yoshihara, Chitoshi Kitamura, and Shin-ichiro Kato* J. Org. Chem., 86, 12559-12568 (2021） [http://doi.org/10.1021/acs.joc.1c00969]

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  8. "Observation of Intramolecular Interaction in Fluorescent Star-Shaped Polymers: Evidence for Energy Hopping between Branch Chains" Motoko S. Asano,* Takatsugu Morita, Tomohiro Miwata, Kotohiro Nomura,* J. Phys. Chem. B, 124, 11510-11518 (2020） [http://dx.doi.org/10.1021/acs.jpcb.0c09613]

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  9. "Open-Shell Singlet Diradicaloid Difluoreno[4,3-b:3′,4′-d]furan and Its Radical Cation and Dianion" Sakura Mori, Motoko Akita, Shuichi Suzuki, Motoko S. Asano, Michihisa Murata, Tsuyoshi Akiyama, Taisuke Matsumoto, Chitoshi Kitamura, Shin-ichiro Kato,* Chem. Commun., 56, 5881-5884 (2020） [doi.org/10.1039/D0CC01638A]

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  10. "Synthesis, Structures, and Properties of Neutral and Radical Cationic S,C,C-Bridged Triphenylamine" Shin-ichiro Kato,* Takanori Matsuoka, Shuichi Suzuki, Motoko S. Asano, Toshitada Yoshihara, Seiji Tobita, Taisuke Matsumoto, Chitoshi Kitamura Org. Lett., 22, 734-738 (2020） [doi.org/10.1021/acs.orglett.9b04575]

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  11. "Interaction between the End Group and the Main Chain of Conjugated Polymers by Time-resolved EPR and Fluorescence Spectroscopy" Motoko S. Asano,* Sho Hashimoto, Takuya Shinozuka, Yasutaka Fushimi, Kotohiro Nomura,* Mol. Phys., 117(19), 2664-2672 (2019） [DOI:10.1080/00268976.2018.1510140]

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  12. “Visualization of Nonemissive Triplet Species of Zn(II) Porphyrins through Cu(II) Porphyrin Emission via the Reservoir Mechanism in a Porphyrin Macroring”, Yusuke Kuramochi, Sho Hashimoto, Yuki Kawakami, Motoko S. Asano,* Akiharu Satake,* Photochem. Photobiol. Sci., 17, 883-888 (2018）[DOI: 10.1039/c8pp00210j]

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  13. “Terthiophene Functionalized Conjugated Triarm Polymers Containing Poly(fluorene-2,7-Vinylene) Arms Having Different Cores. Synthesis and Their Unique Optical Properties”, Kotohiro Nomura*, Tomohiro Miwata, Takuya Shinozuka, Munetsugu Morita, Yves Geerts, Michiya Fujiki, Motoko S. Asano*, ACS Omega, 3, 5052-5063 （2018） [DOI:10.1021/acsomega.8b00676]

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  14. “Effects of Terthiophene as the End-Groups in Triblock Copolymers Consisting of Poly(fluorene vinylene) and Oligo(phenylene vinylene): Time-Resolved Fluorescence and Its Anisotropy”, Motoko S. Asano*, Yoshifumi Yasuda, Daichi Kagota, Tahmina Haque, and Kotohiro Nomura,* J. Photochem. Photobiol. A, 349, 18-24（2017）[DOI:10.1016/j.jphotochem.2017.08.039]

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  15. “Effects of End-Groups on Photophysical Properties of Poly(9,9di-n-octyl-uorene-2,7-vinylene)s Linked with Metalloporphyrins: Synthesis and Time-Resolved Fluorescence Spectroscopy”, Yasutaka Fushimi, Misaki Koinuma, Yoshifumi Yasuda, Kotohiro Nomura,*and Motoko S. Asano*, Macromolecules 50 (5), 1803-1814 （2017）[DOI:10.1021/acs.macromol.7b00047].

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  16. “Prolonged Lifetime of Near IR Emission due to a Reservoir State in a Phenylene-Linked　Copper(II) Porphyrin Zinc (II) Porphyrin Dimer”, Motoko S. Asano,* Masanori Shibuki, and Takuhiro Otsuka, Chem. Lett., 45, 1114-1116 (2016) [doi:10.1246/cl.160442i].

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  17. “Time-resolved Fluorescence Spectra in the End-Functionalized Conjugated Triblock Copolymers Consisting of Poly(fluorene vinylene) and Oligo(phenylene vinylene): Proposal of Dynamical Distortion in the Excited State” Motoko S. Asano,* Daichi Kagota, Tahmina Haque, Misaki Koinuma, Akiko Inagaki and Kotohiro Nomura*, Macromolecules 48 (17), 6233-6240（2015）[DOI: 10.1021/acs.macromol.5b01084].

Selected papers

  1. "Enhanced Intersystem Crossing due to Long-Range Exchange Interaction in Copper(II) Porphyrin-Free Base Porphyrin Dimers : HOMO and Spacer Dependence" Motoko S. Asano,* Kazuma Okamura, Akihoro Jin-mon, Sadaharu Takahashi and Youkoh Kaizu,　 Chem. Phys., 419, 250-260(2013) [10.1016/j.chemphys.2013.03.010]

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  2. "Superexchange Mediated Energy Transfer in Zinc(II) Porphyrin -Free Base Porphyrin Dimers: Comparison of m- and p-Bis(phenylethynyl) phenylene Linked Dimers " Motoko S. Asano,* Ken-ichi Yamashita, Masato Kitabayashi, Kazuki Kusama, Daichi Kagota and Ken-ichi Sugiura, Phys. Chem. Chem. Phys., 13(28), 12712-12715(2011). [10.1039/C1CP20539K].

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  3. "Temperature Dependent Emission of Copper(I) Phenanthroline Complexes with Bulky Substituents: Estimation of an Energy Gap between the Singlet and Triplet MLCT States " Motoko S. Asano,* Kazuhito Tomiduka, Keita Sekizawa, Ken-ichi Yamashita, and Ken-ichi Sugiura, Chem. Lett., 39, No.4, pp.376--378(2010) .

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  4. "Observation of a Photoexcited State of a Paramagnetic Transition Metal Complex by Time-Resolved Electron Paramagnetic Resonance Spectroscopy” Y. Kandraskin, M. S. Asano, A. van der Est, Phys. Chem. Chem. Phys., 8(18), 2129-2132 (2006).

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  5. "Spin-Multiplicity of a Moderately Coupled Triplet-Doublet Spin Pair in a p-Biphenylelne-Linked Porphyrin Dimer ", M. S. Asano,* K. Ishizuka, Y. Kaizu, Mol. Phys., 104(10-11), 1609-1618 (2006).

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  6. "EPR Spectra of Gable-Type Copper(II) Porphyrin Dimers in Fluid Solution: Extraction of Exchange Interaction in Weakly Coupled Doublet Pairs", N. Toyama, M. Asano-Someda,* Y. Kaizu, Mol. Phys., 101(6), 733-742, (2003).

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  7. "Light-Induced Electron Spin Polarization of a Weakly Coupled Triplet-Doublet Spin Pair in a Covalently Linked Porphyrin Dimer", A. van der Est,* M. Asano-Someda,* P. Ragogna, Y. Kaizu J. Phys. Chem. A, 106 (37), 8531-8542 (2002).

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  8. "Enhanced Intersystem Crossing in Gable-Type Copper(II) Porphyrin-Free Base Porphyrin Dimers: Evidence of Through-Bond Exchange Interaction", N. Toyama, M. Asano-Someda,* T. Ichino, Y. Kaizu, J. Phys. Chem. A, 104 (21), 4857-4865 (2000).

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  9. "Intramolecular Energy Transfer in a Covalently Linked Copper(II) Porphyrin - Free Base Porphyrin Dimer: Novel Spin Polarization in the Energy Acceptor", M. Asano-Someda,* A. van der Est,* U. Krüger, D. Stehlik, Y. Kaizu, H. Levanon, J. Phys. Chem. A, 103 (34), 6704-6714 (1999).

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  10. "Highly Efficient Triplet-Triplet Intramolecular Energy Transfer and Enhanced Intersystem Crossing in Rigidly Linked Copper(II) Porphyrin-Free Base Porphyrin Hybrid Dimers", M. Asano-Someda, Y. Kaizu, Inorg. Chem., 38(10), 2303-2322 (1999).

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  11. "Time-Resolved Resonance Raman Spectra of Meso-Substituted Copper Porphyrins in the T1 State: Implication for the Solvent Dependent Red-Shift of Emission Spectra", M. Asano-Someda, S. Sato, K. Aoyagi, T. Kitagawa, J. Phys. Chem., 99 (38), 13800-13807 (1995).

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  12. "Red-Shifted Emission Spectra of Several Meso-Substituted Copper Porphyrins in Fluid Solution", M. Asano-Someda, Y. Kaizu, J. Photochem. Photobiol. A, 87, 23-29 (1995).

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  13. "The Lowest Excited States of Copper Porphyirns", M. Asano, Y. Kaizu, H. Kobayashi, J. Chem. Phys., 89 (11), 6567-6576 (1988).

 

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