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Shoji Y, Terashima Y, Ohkubo K, Ito H, Maruyama K, Fukuzumi S, Nakanishi I. Scandium Ion-Promoted Electron-Transfer Disproportionation of 2-Phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl 3-Oxide (PTIO •) in Acetonitrile and Its Regeneration Induced by Water. Int J Mol Sci 2024; 25:4417. [PMID: 38674002 PMCID: PMC11050215 DOI: 10.3390/ijms25084417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2024] [Revised: 04/09/2024] [Accepted: 04/16/2024] [Indexed: 04/28/2024] Open
Abstract
2-Phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide (PTIO•), a persistent nitronyl nitroxide radical, has been used for the detection and trapping of nitric oxide, as a redox mediator for batteries, for the activity estimation of antioxidants, and so on. However, there is no report on the reactivity of PTIO• in the presence of redox-inactive metal ions. In this study, it is demonstrated that the addition of scandium triflate, Sc(OTf)3 (OTf = OSO2CF3), to an acetonitrile (MeCN) solution of PTIO• resulted in an electron-transfer disproportionation to generate the corresponding cation (PTIO+) and anion (PTIO-), the latter of which is suggested to be stabilized by Sc3+ to form [(PTIO)Sc]2+. The decay of the absorption band at 361 nm due to PTIO•, monitored using a stopped-flow technique, obeyed second-order kinetics. The second-order rate constant for the disproportionation, thus determined, increased with increasing the Sc(OTf)3 concentration to reach a constant value. A drastic change in the cyclic voltammogram recorded for PTIO• in deaerated MeCN containing 0.10 M Bu4NClO4 was also observed upon addition of Sc(OTf)3, suggesting that the large positive shift of the one-electron reduction potential of PTIO• (equivalent to the one-electron oxidation potential of PTIO-) in the presence of Sc(OTf)3 may result in the disproportionation. When H2O was added to the PTIO•-Sc(OTf)3 system in deaerated MeCN, PTIO• was completely regenerated. It is suggested that the complex formation of Sc3+ with H2O may weaken the interaction between PTIO- and Sc3+, leading to electron-transfer comproportionation to regenerate PTIO•. The reversible disproportionation of PTIO• was also confirmed by electron paramagnetic resonance (EPR) spectroscopy.
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Grants
- JP18K06620 Ministry of Education, Culture, Sports, Science and Technology
- JP20H02779 Ministry of Education, Culture, Sports, Science and Technology
- JP20H04819 Ministry of Education, Culture, Sports, Science and Technology
- JP18H04650 Ministry of Education, Culture, Sports, Science and Technology
- JP17H03010 Ministry of Education, Culture, Sports, Science and Technology
- JP16H02268 Ministry of Education, Culture, Sports, Science and Technology
- JP23K04686 Ministry of Education, Culture, Sports, Science and Technology
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Affiliation(s)
- Yoshimi Shoji
- Quantum RedOx Chemistry Team, Institute for Quantum Life Science (iQLS), Quantum Life and Medical Science Directorate (QLMS), National Institutes for Quantum Science and Technology (QST), Chiba-shi 263-8555, Chiba, Japan; (Y.S.); (H.I.)
| | - Yuri Terashima
- Environmental Radiation Effects Research Group, Department of Radiation Measurement and Dose Assessment, Institute for Radiological Science (NIRS), Quantum Life and Medical Science Directorate (QLMS), National Institutes for Quantum Science and Technology (QST), Chiba-shi 263-8555, Chiba, Japan; (Y.T.); (K.M.)
| | - Kei Ohkubo
- Institute for Advanced Co-Creation Studies, Open and Transdisciplinary Research Initiatives, Osaka University, Suita 565-0871, Osaka, Japan;
| | - Hiromu Ito
- Quantum RedOx Chemistry Team, Institute for Quantum Life Science (iQLS), Quantum Life and Medical Science Directorate (QLMS), National Institutes for Quantum Science and Technology (QST), Chiba-shi 263-8555, Chiba, Japan; (Y.S.); (H.I.)
| | - Kouichi Maruyama
- Environmental Radiation Effects Research Group, Department of Radiation Measurement and Dose Assessment, Institute for Radiological Science (NIRS), Quantum Life and Medical Science Directorate (QLMS), National Institutes for Quantum Science and Technology (QST), Chiba-shi 263-8555, Chiba, Japan; (Y.T.); (K.M.)
| | - Shunichi Fukuzumi
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Republic of Korea;
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Ibaraki, Japan
| | - Ikuo Nakanishi
- Quantum RedOx Chemistry Team, Institute for Quantum Life Science (iQLS), Quantum Life and Medical Science Directorate (QLMS), National Institutes for Quantum Science and Technology (QST), Chiba-shi 263-8555, Chiba, Japan; (Y.S.); (H.I.)
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Kotani H, Shimomura H, Horimoto M, Ishizuka T, Shiota Y, Yoshizawa K, Yanagisawa S, Kawahara-Nakagawa Y, Kubo M, Kojima T. Fundamental electron-transfer and proton-coupled electron-transfer properties of Ru(iv)-oxo complexes. Dalton Trans 2019; 48:13154-13161. [DOI: 10.1039/c9dt02734c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reorganization energies (λ) of electron transfer (ET) and proton-coupled ET (PCET) from electron donors to isolated RuIV(O) complexes were determined to be in the range of 1.70–1.88 eV (ET) and 1.20–1.26 eV (PCET).
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Affiliation(s)
- Hiroaki Kotani
- Department of Chemistry
- Graduate School of Pure and Applied Sciences
- University of Tsukuba and CREST (JST)
- Tsukuba
- Japan
| | - Hinatsu Shimomura
- Department of Chemistry
- Graduate School of Pure and Applied Sciences
- University of Tsukuba and CREST (JST)
- Tsukuba
- Japan
| | - Momoka Horimoto
- Department of Chemistry
- Graduate School of Pure and Applied Sciences
- University of Tsukuba and CREST (JST)
- Tsukuba
- Japan
| | - Tomoya Ishizuka
- Department of Chemistry
- Graduate School of Pure and Applied Sciences
- University of Tsukuba and CREST (JST)
- Tsukuba
- Japan
| | - Yoshihito Shiota
- Institute for Materials Chemistry and Engineering
- Kyushu University
- Fukuoka 819-0395
- Japan
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering
- Kyushu University
- Fukuoka 819-0395
- Japan
| | | | | | - Minoru Kubo
- Graduate School of Life Science
- University of Hyogo
- Hyogo 678-1297
- Japan
| | - Takahiko Kojima
- Department of Chemistry
- Graduate School of Pure and Applied Sciences
- University of Tsukuba and CREST (JST)
- Tsukuba
- Japan
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Guo H, Zhu L, Dang C, Zhao J, Dick B. Synthesis and photophysical properties of ruthenium(ii) polyimine complexes decorated with flavin. Phys Chem Chem Phys 2018; 20:17504-17516. [DOI: 10.1039/c8cp02358a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Phosphorescent emission from a flavin localized triplet excited state (3IL) is observed for the first time in a flavin decorated tris(dipyridine) Ru(ii) complex with strong visible light absorption.
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Affiliation(s)
- Huimin Guo
- State Key Laboratory of Fine Chemicals
- School of Chemistry
- Dalian University of Technology
- Dalian
- P. R. China
| | - Lijuan Zhu
- State Key Laboratory of Fine Chemicals
- School of Chemistry
- Dalian University of Technology
- Dalian
- P. R. China
| | - Can Dang
- State Key Laboratory of Fine Chemicals
- School of Chemistry
- Dalian University of Technology
- Dalian
- P. R. China
| | - Jianzhang Zhao
- State Key Laboratory of Fine Chemicals
- School of Chemistry
- Dalian University of Technology
- Dalian
- P. R. China
| | - Bernhard Dick
- Institut für Physikalische und Theoretische Chemie
- Universität Regensburg
- Regensburg
- Germany
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Suzuki W, Kotani H, Ishizuka T, Ohkubo K, Shiota Y, Yoshizawa K, Fukuzumi S, Kojima T. Thermodynamics and Photodynamics of a Monoprotonated Porphyrin Directly Stabilized by Hydrogen Bonding with Polar Protic Solvents. Chemistry 2017; 23:4669-4679. [DOI: 10.1002/chem.201606012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Wataru Suzuki
- Department of Chemistry; Faculty of Pure and Applied Sciences; University of Tsukuba and CREST (JST); 1-1-1 Tennoudai, Tsukuba Ibaraki 305-8571 Japan
| | - Hiroaki Kotani
- Department of Chemistry; Faculty of Pure and Applied Sciences; University of Tsukuba and CREST (JST); 1-1-1 Tennoudai, Tsukuba Ibaraki 305-8571 Japan
| | - Tomoya Ishizuka
- Department of Chemistry; Faculty of Pure and Applied Sciences; University of Tsukuba and CREST (JST); 1-1-1 Tennoudai, Tsukuba Ibaraki 305-8571 Japan
| | - Kei Ohkubo
- Department of Applied Chemistry; Graduate School of Engineering; Osaka University, Suita; Osaka 565-0871 Japan
- Department of Chemistry and Nano Science; Ewha Womans University; Seoul 120-750 South Korea
| | - Yoshihito Shiota
- Institute for Materials Chemistry and Engineering; Kyushu University, Motooka, Nishi-Ku; Fukuoka 819-0395 Japan
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering; Kyushu University, Motooka, Nishi-Ku; Fukuoka 819-0395 Japan
| | - Shunichi Fukuzumi
- Department of Chemistry and Nano Science; Ewha Womans University; Seoul 120-750 South Korea
- Faculty of Science and Technology; Meijo University, SENTAN, Science and Technology Agency (JST), Nagoya; Aichi 468-8502 Japan
| | - Takahiko Kojima
- Department of Chemistry; Faculty of Pure and Applied Sciences; University of Tsukuba and CREST (JST); 1-1-1 Tennoudai, Tsukuba Ibaraki 305-8571 Japan
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Affiliation(s)
- Shunichi Fukuzumi
- Department of Chemistry and Nano Science Ewha Womans University Seoul 03760 Korea
- Faculty of Science and Engineering Meijo University, SENTAN, Japan, Science and Technology Agency (JST) Nagoya, Aichi 468-8502 Japan
| | - Jieun Jung
- Department of Chemistry and Nano Science Ewha Womans University Seoul 03760 Korea
| | - Yong‐Min Lee
- Department of Chemistry and Nano Science Ewha Womans University Seoul 03760 Korea
| | - Wonwoo Nam
- Department of Chemistry and Nano Science Ewha Womans University Seoul 03760 Korea
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Kimoto K, Satoh T, Iwamura M, Nozaki K, Horikoshi T, Suzuki S, Kozaki M, Okada K. Very Long-Lived Photoinduced Charge-Separated States of Triphenylamine–Naphthalenediimide Dyads in Polymer Matrices. J Phys Chem A 2016; 120:8093-8103. [DOI: 10.1021/acs.jpca.6b07705] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kenshi Kimoto
- Department
of Chemistry, Graduate School of Science and Engineering, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan
| | - Tsubasa Satoh
- Department
of Chemistry, Graduate School of Science and Engineering, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan
| | - Munetaka Iwamura
- Department
of Chemistry, Graduate School of Science and Engineering, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan
| | - Koichi Nozaki
- Department
of Chemistry, Graduate School of Science and Engineering, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan
| | - Takafumi Horikoshi
- Department
of Chemistry, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Shuichi Suzuki
- Department
of Chemistry, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Masatoshi Kozaki
- Department
of Chemistry, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Keiji Okada
- Department
of Chemistry, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
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