Photoinduced electron transfer in a covalent benzo[a] pyrene diol epoxide—2′-deoxyguanosine complex
1991; Elsevier BV; Volume: 187; Issue: 6 Linguagem: Inglês
10.1016/0009-2614(91)90442-c
ISSN1873-4448
AutoresL. A. Margulis, Pavel F. Pluzhikov, Bing Mao, V. A. Kuz’min, Yong Joon Chang, T. W. Scott, Nicholas E. Geacintov,
Tópico(s)Luminescence and Fluorescent Materials
ResumoThe fluorescence of the pyrenyl chromophore in a covalently linked benzo [a] pyrene diol epoxide-N22′-deoxyguanosine complex and in noncovalent 7,8,9,10-tetrahydroxytetrahydrobenzo[a] pyrene—deoxyguanosine 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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