Dynamics of electron transfer in amine photooxidation

Autor:	C. G. Schaeffer, K. S. Peters, S. C. Freilich
Rok vydání:	1980
Předmět:	Photodissociation Quantum yield General Chemistry DABCO Photochemistry Biochemistry Catalysis chemistry.chemical_compound Electron transfer Colloid and Surface Chemistry Fluorenone chemistry Excited state Benzophenone Triplet state
Zdroj:	Journal of the American Chemical Society. 102:5701-5702
ISSN:	1520-5126 0002-7863
DOI:	10.1021/ja00537a060
Popis:	Studies were initiated utilizing picosecond (ps) absorption spectroscopy, to directly monitor the dynamics of electron transfer from 1,4-diazabicyclo(2.2.2)octane (Dabco) to the excited states of benzophenone and fluorenone. These two systems were chosen because of their contrasting photochemistry. The quantum yield for photoreduction of benzophenone in polar solvents is generally greater than 0.1, while that of fluorenone is zero. In polar solvents, the proposed mechanism dictates that an electron is transferred to the excited singlet state fluorenone, which then back-transfers the electron, regenerating ground-state fluorenone and amine. Photolysis of benzophenone in the presence of an amine transfers an electron to an excited triplet state, forming an ion pair that is stable relative to diffusional separation. The results of this study verify this proposal.
Databáze:	OpenAIRE
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