title: [Photophysics of complex formations between chlorophyll a and its analogs with pi acceptors].
abstract: Efficient quenching of fluorescence was shown to proceed in the complexes of chlorophyll a and its analogs with tetracyanochinodimethane (TCD), 1,3,5-trinitrobenzene (TNB), m-dinitrobenzene (DNB) and n-benzoquinone. In chlorophyll a--TCD and--DNB complexes quenching is characterized by the rate constant approximately greater than 5 x 10(10) s-1, and in chlorophyll a--n-benzoquinone greater approximately than 5 x 10(9) s-1. Possible ways of desactivation of singlet-excited state of chlorophyll a in the complexes with TCD and TNB were analysed. No triplet states of chlorophyll a complexes with TCD and TNB and no cation-radicals were recorded. It is suggested that efficient desactivation of the pigment singlet-excited state may be explained by a reversible phototransfer of the electron.
mesh_terms: D016227:Benzoquinones; D055598:Chemical Phenomena; D002621:Chemistry; D002734:Chlorophyll; D004136:Dinitrobenzenes; D005453:Fluorescence; D009570:Nitriles; D010777:Photochemistry; D011809:Quinones; D014301:Trinitrobenzenes
chemical_list: D016227:Benzoquinones; D004136:Dinitrobenzenes; D009570:Nitriles; D011809:Quinones; D014301:Trinitrobenzenes; D002734:Chlorophyll; C013703:tetracyanoquinodimethane; C004532:quinone
vernacular_title: Fotofizika protsessov v kompleksakh khlorofilla a i ego analogov s lambda-aktseptorami.