Flavin-photosensitized monomerization of dimethylthymine cyclobutane dimer: remarkable effects of perchloric acid and participation of excited-singlet, triplet, and chain-reaction pathways

Autor:	Yasuhiro Masaki, Kunihito Miyake, Chyongjin Pac, Akio Yoshimura, Takeshi Ohno, Shozo Yanagida
Rok vydání:	1992
Předmět:	Dimer Photodissociation Quantum yield General Chemistry Flavin group Photochemistry Biochemistry Catalysis Cyclobutane chemistry.chemical_compound Colloid and Surface Chemistry chemistry Flash photolysis Perchloric acid Lumiflavin
Zdroj:	Journal of the American Chemical Society. 114:10756-10762
ISSN:	1520-5126 0002-7863
DOI:	10.1021/ja00053a011
Popis:	We report the efficient monomerization of the cis-cisoid cyclobutane dimer of 1,3-dimethylthymine photosensitized by riboflavin tetraacetate (r-Fl), 3-methyl-8-chloro-10-phenyl-5-deazaflavin (d-Fl), and lumiflavin in acetonitrile in the presence of HClO 4 , as a model reaction of photorepair. The limiting quantum yields are unity for the r-Fl-photosensitized monomerization in degassed and aerated solution and also for the d-Fl-photosensitized run in degassed solution. Mechanistic studies involving kinetic analysis of the reactions, fluorescence quenching, and laser-flash photolysis demonstrate that the photosensitized run in degassed solution
Databáze:	OpenAIRE
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