Photosensitized processes in dicarbocyanine dyes induced by energy transfer: delayed fluorescence, trans→ cis isomerization and electron transfer

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) and its chlorine ( 7), bromine ( 8) and methyl ( 9) derivatives were s...

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Bibliographic Details
Published in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 2001-06, Vol.141 (1), p.39-45
Main Authors: Chibisov, Alexander K, Shvedov, Semen V, Görner, Helmut
Format: Article
Language:English
Subjects:
Delayed fluorescence
Dicarbocyanine dyes
Photoisomerization
Sensitization
Triplet state
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Summary: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) and its chlorine ( 7), bromine ( 8) and methyl ( 9) derivatives were studied in deoxygenated acetonitrile upon anthracene-sensitized excitation by conventional and ns-flash photolysis. The emission is attributed to the sensitized (mixed) type rather than E- or P-type delayed fluorescence. The triplet state of the dyes, radicals and a cis isomer with absorption maxima at 650–1000, 450–500 and 620–695 nm, respectively, were spectroscopically and kinetically distinguished. The trans→ cis photoisomerization can be initiated by both triplet (mostly) and singlet states of the dyes.
ISSN:1010-6030
1873-2666
DOI:10.1016/S1010-6030(01)00426-9