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Photoinduced electron transfer in a covalent benzo[a] pyrene diol epoxide—2′-deoxyguanosine complex

✍ Scribed by Leonid Margulis; Pavel F. Pluzhikov; Bing Mao; Vladimir A. Kuzmin; Yong J. Chang; Thomas W. Scott; Nicholas E. Geacintov

Book ID
103033234
Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
531 KB
Volume
187
Category
Article
ISSN
0009-2614

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✦ Synopsis

The fluorescence of the pyrenyl chromophore in a covalently linked benzo[a]pyrene diol epoxide-N*-2'deoxyguanosine complex, and in noncovalent 7,8,9,lD_tetrahydroxytetrahydm~nzo[a]pyrrnedeoxyguanosine complexes, is strongly quenched in aqueous solution by a photoinduced electron transfer mechanism. The results of transient absorption spectroscopy experiments with picosecond laser pulse excitation are consistent with the formation of a short-lived charge transfer exciplex (nanosecond time scale) in which the pyrenyl residue acts as an electron acceptor.

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