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WAKASA Masanobu

Faculty: Graduate School of Science and Engineering TEL:
Position: Manager(Dean)  Professor ■FAX:
Address: 255 Shimo-Okubo, Sakura-ku, Saitama City, Saitama 338-8570, JAPAN ■Mail Address:
■Web site:

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Assigned Class

Faculty of Science

Research

Books, Articles, etc.

Books
"Reactions in the Magnetic Field", in Encyclopedia of Physical Organic Chemistry Vol.2; Z. Wang, U. Wille, E. Juaristi Eds.;
John Wiley&Sons, New York :pp1035-1126. 201704
ISBN:978-1-118-46858-6
Masanobu Wakasa, Tomoaki Yago, Atom Hamasaki, and Masao Gohdo

Articles
Anthropogenic CO2 emission estimates in the Tokyo Metropolitan Area from ground-based CO2 column observations
,Atmospheric Chemistry and Physics,23:15097–15119 2023
Hirofumi Ohyama, Matthias Max Frey, Isamu Morino, Kei Shiomi, Masahide Nishihashi, Tatsuya Miyauchi, Hiroko Yamada, Makoto Saito, Masanobu Wakasa, Thomas Blumenstock, Frank Hase

Singlet Fission in Solid 1,6-Diphenyl-1,3,5-hexatriene Dicarboxylic Acids and Esters: Effects of meta- and para-Substitution
,J. Phys. Chem. C,126:8742 2022
Yoriko Sonoda, Ryuzi Katoh, Norimitu Tohnai, Tomoaki Yago, Masanobu Wakasa

Triplet−Triplet Annihilation via the Triplet Channel in Crystalline 9,10-Diphenylanthracene
,J. Phys. Chem. Lett.,13: 8768-8774 2022
Tomoaki Yago, Manami Tashiro, Kiichi Hasegawa, Masao Gohdo, Syuta Tsuchiya, Tadaaki Ikoma, Masanobu Wakasa

Geminate Delayed Fluorescence by Anisotropic Diffusion-Mediated Reversible Singlet Fission and Triplet Fusion
,J. Phys. Chem. C,125:3295-3304 2021
Kazuhiko Seki, Tomomi Yoshida, Tomoaki Yago, Masanobu Wakasa and Ryuzi Katoh

Low Magnetic Field Effects on a Photoinduced Electron Transfer Reaction in an Ionic Liquid
,Chem. Phys. Lett.,773:138569 2021
Nanshi Harada, Taisuke Matsuo, Tomoaki Yago, Kiminori Maeda, and Masanobu Wakasa

Diffusion of Radical Ions in Ionic Liquids Having Long Alkyl Chains
,J. Phys. Chem. B,123:8425-8432 2019
Hikaru Tsuchida, Tomoaki Yago, Masanobu Wakasa

Structure and Dynamics of Triplet-Exciton Pairs Generated from Singlet Fission Studied via Magnetic Field Effects
,Communications Chemistry (Nature Research),1:9 2018
Masanobu Wakasa, Tomoaki Yago, Yoriko Sonoda, Ryuzi Katoh

A Spin Exchange Model for Singlet Fission
,Chem. Phys. Lett.,695:240-244 2018
Tomoaki Yago and Masanobu Wakasa

Exploring the Structure of an Exchange Coupled Triplet Pair Generated by Singlet Fission in Crystalline Diphenylhexatriene: Anisotropic Magnetic Field Effects on Fluorescence in High Fields
,J. Phys. Chem. C,122:22264-22272 2018
Kei Ishikawa, Tomoaki Yago, Masanobu Wakasa

A Spin Exchange Model for Singlet Fission
,Chem. Phys. Lett.,695:240-244 2018
Tomoaki Yago and Masanobu Wakasa

"Singlet Fission in Fluorinated Diphenylhexatrienes"
,J. Phys. Chem. C, ,121:25666-25671 2017
Ryuzi Katoh, Masaaki Hashimoto, Akinori Takahashi, Yoriko Sonoda, Tomoaki Yago, and Masanobu Wakasa

Magnetic Field Effects on Triplet Pair Generated by Singlet Fission in an Organic Crystal: Application of Radical Pair Model to Triplet Pair
,J. Phys. Chem. C,120:27858-27870 2016
Tomoaki Yago, Kei Ishikawa, Ryuzi Katoh, Masanobu Wakasa

A Practical Approach to Calculate the Time Evolutions of Magnetic Field Effects on Photochemical Reactions in Nano-Structured Materials
,Phys. Chem. Chem. Phys.,17:9737-9747 2015
Tomoaki Yago, Masanobu Wakasa

Time-Resolved Detection of Magnetic Field Effects on Radical Pairs in Micelles: Two-Step Two-Laser Fluorescence Spectroscopy of Transient Radicals
,J. Phys. Chem. C,119:20217–20223 2015
Tomoaki Yago, Ayuto Takashino, Masanobu Wakasa

Photocyclization reactions of diarylethenes via the excited triplet state
,J. Phys. Chem. A,119: 11138-11145 2015
Ryutaro Murata, Tomoaki Yago, Masanobu Wakasa

What can be learned from magnetic field effects on singlet fission: Role of exchange interactions in excited triplet pairs
,J. Phys. Chem. C,119:25840-25844 2015
Masanobu Wakasa, Mana Kaise, Tomoaki Yago, Ryuzi Katoh, Yusuke Wakikawa, Tadaaki Ikoma

Diffusion and Solvation of Radical Ions in an Ionic Liquid Studied by the MFE Probe
,J. Phys. Chem. C,,118:22356-22367 2014
Tomoaki Yago, Yuya Ishii, Masanobu Wakasa,

Local Structure of Ionic Liquids Probed by Self-quenching of Thiobenzophenone
,Phys. Chem. Chem. Phys.,15:787-794 2013
Miyuki Tanaka, Tomoaki Yago, Masanobu Wakasa

Cage Lifetime of Ionic Liquids as Studied by the Magnetic Field Effect Probe
,Phys. Chem. Chem. Phys.,14:3490-3497 2012
Tomohide Okada, Tomoaki Yago, Tadashi Takamasu, Masanobu Wakasa

Photochemical Primary Process of Photo-Fries Rearrangement Reaction of 1-Naphthyl Acetate as Studied by MFE Probe
,Phys. Chem. Chem. Phys.,13:755-761 2011
Masao Gohdo, Tadashi Takamasu, Masanobu Wakasa

Nanoscale Structure and Diffusion Process of Ionic Liquid as Studied by the MFE Probe
,J. Phys. Chem. C. ,115:2673-2678 2011
Tomoaki Yago, Masanobu Wakasa

Photochemical Primary Process of Photo-Fries Rearrangement Reaction of 1-Naphthyl Acetate as Studied by MFE Probe
,Phys. Chem. Chem. Phys.,13:755-761 2011
Masao Gohdo, Tadashi Takamasu, Masanobu Wakasa

Cyclization Reaction of Diarylethene through the Triplet Excited State
,Bull. Chem. Soc. Jpn. [Selected Papers],12:1336-1338 2011
Ryutaro Murata, Tomoaki Yago, Masanobu Wakasa

Magnetic Field Effects on Photochemical Reaction in Ionic Liquids with Short Alkyl Chains
, J. Phys. Chem. C. ,115:21063-21071 2011
Tomoaki.Yago, Atom Hamasaki, Miyuki Tanaka, Tadashi Takamasu, Masanobu Wakasa

Fluorescent Spherical Particle Formationfrom Solid Polysilanes by the Aid of Laser Ablation and Photochemical Reaction
,J. Photopolym. Sci. Technol.,123:371-378 2010
Hiroshi Morita, Yu Aoki, Shigeru Takahara, Masanobu Wakasa

Hydrogen Bonding Effects on the Reorganization Energy for Photo-induced Charge Separation Reaction between Porphyrin and Quinone Studied by Nano-second Laser Flash Photolysis
,J. Phys. Chem. B,114:2476-2483 2010
TomoakiYago,Masao Gohdo, Masanobu Wakasa

Magnetic Field Effects on Photochemical Reaction in Masoporous Silicates of MCM-41 under High Magnetic Fields of up to 5 T
,J. Phys. Chem. C.,114:22190-22196 2010
Tomoaki Maeyama, Hiroki, Matsui, Tomoaki Yago, Masanobu Wakasa

Photostability of Water Dispersible CdTe Quantum Dots: Capping Ligands and Oxygen
,Chem. Lett.,39:354-356 2010
Saim Emin, Alexandre Loukanov, Masanobu Wakasa, Seiichiro Nakabayashi, Yasuko Kaneko

Reexamination of the Photochemical Primary Process of Photo-Fries Rearrangement Reaction as Studied by MFE Probe
,Chem. Lett.,39:106-107 2010
Masao Gohdo, Masanobu Wakasa

Ethanol Concentration Dependence of Photo-induced Charge Separation Reaction between Zinc Tetraphenylporphyrin and Duroquinone Studied by Laser Flash Photolysis
Chemical Society of Japan,Chem. Lett.,38(9):880-881 2009
Tomoaki Yago, Masao Gohdo, Masanobu Wakasa

Nano-scale Heterogeneous Structure of Ionic Liquid as Revealed by Magnetic Field Effects
American Chemical Society,J. Phys. Chem. B,113(31):10559-10561 2009
Masanobu Wakasa, Tomoaki Yago, Atom Hamasaki

Photochemical Process of Thiobenzophenone as Studied by Laser Flash Photolysis
Chemical Society of Japan,Chem. Lett.,38(11):1086-1087 2009
Miyuki Tanaka, Tomoaki Yago, Masanobu Wakasa

Magnetic Field Effect on a Radical Pair Reaction as a Probe of Microviscosity
,Journal of Physical Chemistry B,112(45):14185-14192 200811
Atom Hamasaki;Tomoaki Yago;Masanobu Wakasa

Magnetic field effects due to the relaxation mechanism observed for the photo-induced electron transfer reaction of zinc(II) tetraphenylporphyrin and 2-methyl-1,4-naphthoquinone
,Journal of Photochemistry and Photobiology a-Chemistry,199(2/3):130-135 200809
Masao Gohdo;Yasutaka Kitahama;Yoshio Sakaguchi;Masanobu Wakasa

磁場とナノ細孔を用いた複合反応場での光化学反応制御
埼玉大学総合研究機構,総合研究機構研究プロジェクト研究成果報告書(6(平成19年度)) 200809
若狭 雅信

Anomalous magnetic field effects on photochemical reactions in ionic liquid under ultrahigh fields of up to 28 T
,Journal of Physical Chemistry B,112(11):3375-3379 200803
Atom Hamasaki;Tomoaki Yago;Tadashi Takamasu;Giyuu Kido;Masanobu Wakasa

Studies of germanium-platinum bonds in bis(aryl-substituted germyl)platinum complexes by laser flash photolysis and chemical trapping experiments
,Chemistry Letters,37(1):62-63 200801
Kunio Mochida;Yusuke Masukawa;Atsuko Yarnada;Mai Yanaga;Masato Nanjo;Hidekazu Arii;Masao Gohdo;Masanobu Wakasa

イオン液体中での光化学反応と磁場効果
埼玉大学総合研究機構,総合研究機構研究プロジェクト研究成果報告書(5(18年度)):525-526 2007
若狭 雅信
Photochemistry and Magnetic field effects in ionic liquids

光触媒反応の磁場効果とメカニズム解明
埼玉大学総合研究機構,総合研究機構研究プロジェクト研究成果報告書(4(17年度)) 2006
若狭 雅信
Magnetic Field Effects on the Photocatalytic Reaction

Abstraction Reaction of Triplet 4-Methoxy-benzophenone with Thiophenol as Studied by a Picosecond Laser Flash Photolysis Technique
,Mol. Phys.,100:1283 2002

Re-examination of the Magnetic Field Effects on the Thermal Reactions of Benzyl and Pentafluorobenzyl Halides with n-Butyllithium in Hexane
,Mol. Phys.,100(8):1099-1105 2002

Time-resolved EPR and ODMR Studies on the Lowest Excited Triplet States of α-Silyland α-Germyl Ketones
,Mol. Phys.,99:1183 2001

Magnetic Field Effects on the Dynamic Behavior of a Radical Pair As Studied by a Sub-Nanosecond Laser Flash Photolysis Technique
,Chem. Phys. Lett.,327(5/6):343-350 2000

Magnetic Field Effects due to the delta g Mechanism Upon Chemical Reactions Through Radical Pairs Under Ultrahigh Fields of up to 30 T
,J. Am. Chem. Soc.,121(39):9191-9197 1999

Mechanism of the Reactions of Tri-n-butylstannyl Anion with n-Butyl Bromide and Iodide As Studied by the 119Sn CIDNP Technique
,Organometallics,18(16):2941–2943 1999

Enrichment of Germanium-73 with the Magnetic Isotope Effect on the Hydrogen Abstraction Reaction of Triplet  Benzophenone with Triethylgermane in an SDS Micellar Solution
,J. Am. Chem. Soc.,120(13):3227–3230 1998

Anomalous Magnetic Filed Effects Observed in the Reaction of a Triplet Biradical Involving an O-Centered Radical
,J. Phys. Chem.,99(47):17074–17077 1995

Enrichment of Germanium-73 with the Magnetic Isotope Effect
,J. Phys. Chem.,97(51):13444-13446 1993

The First Direct Observation of Magnetic Field Effects on the Dynamic Behavior of Radical Pairs Involving Group 14 Silicon and Germanium Centered Radicals
,J. Am. Chem. Soc.,114:8171 1992

Presentation
Low field effects on the yield of benzophenone anion radical generated by photoinduced reaction in an ionic liquid
22nd International Society of Magnetic Resonance Conference and 9th Asia-Pacific NMR Symposium 202108
Ren Sakagushi・Kiminori Maeda・Tomoaki Yago・Masanobu Wakasa

Time-resolved ESR spectrum of photoinduced electron transfer reaction in ionic liquid
22nd International Society of Magnetic Resonance Conference and 9th Asia-Pacific NMR Symposium 202108
Tomohito Sato・Tomoaki Yago・Masanobu Wakasa

Low Magnetic Field Effects on Triplet Pair Recombination in Organic Solids
22nd International Society of Magnetic Resonance Conference and 9th Asia-Pacific NMR Symposium 202108
Tomoaki Yago・Yuta Shinohara・Masanobu Wakasa

Low Magnetic Field Effects on Photochemical Reactions in Ionic Liquids
5th Kanto Spin Chemistry Meeting 201912
Nanshi Harada, Tomoaki Yago, Kiminori Mada, Masanobu Wakasa

"Characterization of Triplet Pairs Generated by Singlet Fission"
9th International Conference on Molecular Electronics and Bioelectronics (M&BE9) 201706
T. Yago, Y. Sonoda, K. Ishikawa, R. Katoh, M. Wakasa

"Characterization of Triplet Pairs Generated by Singlet Fission"
5th Awaji International Workshop on “Electron Spin Science & Technology: Biological and Materials Science Oriented Applications” (5th AWEST 2017) (Awaji Yumebutai International Conference Center, the Awaji Island, Hyogo 201706
Yago, Y. Sonoda, K. Ishikawa, R. Katoh, M. Wakasa

Magnetic Field Effects on Singlet Fission in Organic Crystals
The 4th Awaji International Workshop on Electron Spin Science & Technology: Biological and Materials Science Oriented Applications 201606
T. Yago and M. Wakasa

Magnetic Field Effects on Photochemical Reactions in Ionic Liquids
The 3rd Awaji International Workshop on Electron Spin Science & Technology: Biological and Materials Science Oriented Applications 201506
T. Yago and M. Wakasa

Magnetic Field Effects on Photochemical Reactions in Ionic Liquids
The 14th International Spin Chemistry Meeting (Kolkata, Saha Institute of Nuclear Physics, India) 201503
T. Yago and M. Wakasa

Time-Resolved Faraday Rotation Study on Photo-Excited Triplet State of Organic Molecule in Solutions"
Joint Conference of Asia-Pacific EPR/ESR Symposium, International EPR (ESR) Society Symposium, and the 53th SEST Annual Meeting (Nara Todaiji Cultural Center) 201411
T.Yago and M. Wakasa "

"Time-Resolved EPR Study on Ruthenium(II) Complex Having an Arylborane Charge-Transfer Unit"
2014 International Conference on Artificial Photosynthesis (Awaji, Awaji Yumebutai International Conference Center) 201411
M. Wakasa, T. Yago, R. Kumagai, E. Sakuda, and N. Kitamura

Cyclization Reaction of Diarylethene Derivatives through the Triplet Excited State"
International Conference on Photochemistry 2013 (KU Leuven, Belgium ) 201307
Ryutaro Murata, Tomoaki Yago, Masanobu Wakasa,

PPV誘導体を発光層に用いた有機EL素子の発光に対する磁場効果
第91回春季年会 201103
鈴木康修・矢後友暁・坂口喜生・若狭雅信

チイルラジカルの発光を用いたMFEプローブの開発
第91回春季年会 201103
松岡弘晃・矢後友暁・若狭雅信

ナノ細孔MCM-41中での光化学反応に対する磁場効果:SLE解析
第91回春季年会 201103
矢後友暁・前山智明・松井弘貴・若狭雅信

ナノ秒過渡吸収法によるフォトクロミック反応の研究
第91回春季年会 201103
村田龍太郎・矢後友暁・若狭雅信

ベンゾフェノンの光反応におけるパルスマイクロ波を用いた炭素同位体濃縮法の検討
第91回春季年会 201103
岩見法之・矢後友暁・若狭雅信

マウス繊維芽細胞の成長に対する強磁場の影響
第91回春季年会 201103
松井弘貴・坂井貴文・若狭雅信

磁性光触媒反応の磁場効果
第91回春季年会 201103
阿部俊貴・若狭雅信

Local structure of ionic liquid probed by self-quenching of thiobenzophenone
Pacifichem 2010 201012
M. Tanaka and M. Wakasa

チオベンゾフェノンの光反応に対する磁場効果
第49回電子スピンサイエンス学会年会 201011
田中深雪・矢後友暁・若狭雅信

磁性光触媒反応の磁場効果
第5回日本磁気科学会年会 201010
阿部俊貴・若狭雅信

マウス繊維芽細胞の成長に対する強磁場の影響
第5回日本磁気科学会年会 201010
松井弘貴・坂井貴文・若狭雅信

高磁場下におけるチオベンゾフェノンの光還元反応に対する磁場効果
第5回日本磁気科学会年会 201010
田中深雪・若狭雅信

MFEプローブのよるイオン液体中のCage効果の研究
第4回分子科学討論会 201009
矢後友暁・浜崎亜富・若狭雅信

MFEプローブを用いたイオン液体のアルキル鎖長効果の研究" 第4回分子科学討論会
第4回分子科学討論会 201009
岡田倫英・矢後友暁・高増正・若狭雅信

Brij35ミセル水溶液中でのベンゾフェノンの光反応に対するパルスマイクロ波効果
2010年光化学討論会 201009
岩見法之・矢後友暁・若狭雅信

イオン液体中でのベンゾフェノン‐チオフェノール連結化合物の光化学反応
2010年光化学討論会 201009
岩 祿代・若狭雅信・矢後友暁

Magnetic Field Effects on Photochemical Reactions in Ionic Liquids" Ohkayama Workshop on Fundamental Photochemical Process in Condensed Phase
International Symposium on Structure and Reaction Dynamics of Ionic Liquids in Tokyo 201006
T. Yago, and M. Wakasa

MFEプローブを用いたイオン液体のアルキル鎖長効果の研究
第90回日本化学会春季年会 201003
岡田倫英、矢後友暁、高増正、若狭雅信

チオベンゾフェノンの自己消光をプローブとしたイオン液体の部分構造の検討
第90回日本化学会春季年会 201003
田中深雪、若狭雅信

メゾポーラスシリカMCM-41細孔内での光誘起水素引き抜き反応に対する磁場効果
第90回日本化学会春季年会 201003
松井弘貴、矢後友暁、若狭雅信

光誘起電子移動反応に対する水素結合錯体生成の効果:協奏的過程と段階的過程
第90回日本化学会春季年会 201003
矢後友暁、若狭雅信

磁場効果をプローブとした光フリース転位反応の反応機構の再検討
第90回日本化学会春季年会 201003
神戸正雄、高増正、若狭雅信

磁性光触媒反応の磁場効果
第90回日本化学会春季年会 201003
阿部俊貴、若狭雅信

ミセル水溶液中におけるベンゾフェノンの水素引き抜き反応に対するパルスマイクロ波効果
第90回日本化学会春季年会 201003
岩見法之、矢後友暁、若狭雅信

イオン液体中での光化学反応に対する磁場効果のメカニズム
第48回電子スピンサイエンス学会年会 200911
矢後友暁、若狭雅信

チオベンゾフェノンの光還元反応に対する磁場効果溶媒粘度依存性
第4回日本磁気科学会年会 200911
田中深雪、矢後友暁、若狭雅信

磁場効果をプローブとしたイオン液体とミセル溶液の局所構造の比較
第3回分子科学討論会 200909
田中深雪、矢後友暁、若狭雅信

磁場効果をプローブとした光フリース転位反応のラジカル中間体の検討
第3回分子科学討論会 200909
神戸正雄、高増正、若狭雅信

ナノ秒過渡吸収法による光フリース転位反応に対する磁場効果の直接観測と再検討
光化学討論会 200909
神戸正雄、高増正、若狭雅信

ナノ秒過渡吸収法による光誘起電荷分離過程に対する水素結合効果の研究
光化学討論会 200909
矢後友暁、神戸正雄、若狭雅信

Magnetic Field Effects on Photochemical Reactions in Ionic Liquids
Coil-3 Pre-Symposium, Science of Ionic Liquid 200905
M.Wakasa, T.Yago, and A.Hamasaki