Binding Modes in Metal Ion Complexes of Quinones and Semiquinone Radical Anions: Electron-Transfer Reactivity

ChemPhysChem ◽  
2006 ◽  
Vol 7 (4) ◽  
pp. 942-954 ◽  
Author(s):  
Junpei Yuasa ◽  
Tomoyoshi Suenobu ◽  
Shunichi Fukuzumi
Keyword(s):  
Electron Transfer ◽  
Metal Ion ◽  
Radical Anions ◽  
Semiquinone Radical ◽  
Binding Modes ◽  
Metal Ion Complexes

Formation of superoxide–metal ion complexes and the electron transfer catalysis

2002 ◽  
Vol 226 (1-2) ◽  
pp. 71-80 ◽  
Author(s):  
Shunichi Fukuzumi ◽  
Hideki Ohtsu ◽  
Kei Ohkubo ◽  
Shinobu Itoh ◽  
Hiroshi Imahori
Keyword(s):  
Electron Transfer ◽  
Metal Ion ◽  
Metal Ion Complexes

scholarly journals Catalytic control of electron-transfer processes

2003 ◽  
Vol 75 (5) ◽  
pp. 577-587 ◽  
Author(s):  
Shunichi Fukuzumi
Keyword(s):  
Electron Transfer ◽  
Metal Ions ◽  
Metal Ion ◽  
Photochemical Reactions ◽  
Transfer Reactions ◽  
Intramolecular Electron Transfer ◽  
Radical Anions ◽  
Electron Transfer Reactions ◽  
Transfer Processes ◽  
Electron Transfer Processes

Catalytic control of electron-transfer processes is described for a number of photoinduced and thermal electron-transfer reactions, including back electron transfer in the charge-separated state of artificial photosynthetic compounds. The intermolecular and intramolecular electron-transfer processes are accelerated by complexation of radical anions, produced in the electron transfer, with metal ions that act as Lewis acids. Quantitative measures to determine the Lewis acidity of a variety of metal ions are given in relation with the promoting effects of metal ions in the electron-transfer reactions. The mechanistic viability of metal ion catalysis in electron-transfer reactions is demonstrated by a variety of examples of both thermal and photochemical reactions that involve metal ion-promoted electron-transfer processes as the rate-determining steps, which are made possible to proceed by complexation of radical anions with metal ions.

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