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

Citation
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
ISSN journal
10106030 → ACNP
Volume
141
Issue
1
Year of publication
2001
Pages
39 - 45
Database
ISI
SICI code
1010-6030(20010615)141:1<39:PPIDDI>2.0.ZU;2-Y
Abstract
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 Science B.V. All rights reserved.