Energetics of Primary Charge Separation in Bacterial Photosynthetic Reaction Center Mutants: Triplet Decay in Large Magnetic Fields

Autor:	Alex de Winter, Steven G. Boxer
Rok vydání:	2002
Předmět:	Photosynthetic reaction centre chemistry.chemical_compound Intersystem crossing Radical ion Chemistry Chemical physics Primary charge separation Electron donor Physical and Theoretical Chemistry Triplet state Phosphorescence Photochemistry Ground state
Zdroj:	The Journal of Physical Chemistry A. 107:3341-3350
ISSN:	1520-5215 1089-5639
Popis:	The triplet state of aromatic molecules forms and decays by intersystem crossing, as originally demonstrated by Kasha and Lewis. By contrast, the triplet state of the primary electron donor, 3P, in photosynthetic reaction centers is formed exclusively by spin- and magnetic-field-dependent charge recombination of the initially formed radical ion pair. 3P decays by intersystem crossing at low temperatures; however, at higher temperatures, it can also decay by activated re-formation of the radical ion pair from which it was born, followed by a spin- and magnetic-field-dependent pathway that leads ultimately to the ground state. The discovery of this activated decay pathway leads to an approach for obtaining information on the relative energies of the radical pair and 3P state (Chidsey et al. Proc. Natl. Acad. Sci. U.S.A. 1985, 82, 6850−6854); with knowledge of the absolute energy of 3P from its phosphorescence, the energy of the initial charge separation reaction can be obtained. In this paper, we present th...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9c271082fda68bb2e60decbfa8d62241 https://doi.org/10.1021/jp021867h Zobrazit plný text záznamu