Ak. Chibisov et al., Photosensitized processes in dicarbocyanine dyes induced by energy transfer: delayed fluorescence, trans -> cis isomerization and electron transfer, J PHOTOCH A, 141(1), 2001, pp. 39-45
Citations number
44
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
The triplet-induced photoprocesses of 3,3'-diethylthiadicarbocyanine (1), 3
,3'-diethyloxadicarbocyanine (2), its methyl (3), ethyl (4) and phenyl (5)
derivatives as well as of 1,1',3,3,3',3'-hexamethylindodicarbocyanine (6) a
nd its chlorine (7), bromine (8) and methyl (9) derivatives were studied in
deoxygenated acetonitrile upon anthracene-sensitized excitation by convent
ional and ns-flash photolysis. The emission is attributed to the sensitized
(mixed) type rather than E- or P-type delayed fluorescence. The triplet st
ate of the dyes, radicals and a cis isomer with absorption maxima at 650-10
00, 450-500 and 620-695 nm, respectively, were spectroscopically and kineti
cally distinguished. The trans --> cis photoisomerization can be initiated
by both triplet (mostly) and singlet states of the dyes. (C) 2001 Elsevier
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