P. Pronkin, A. Tatikolov
Aug 31, 2015
Citations
1
Influential Citations
5
Citations
Journal
High Energy Chemistry
Abstract
Photoisomerization, thermal back isomerization, and spectral and kinetic properties of the triplet state of the oxacarbocyanine dyes 3,3′-diethyloxacarbocyanine iodide (OC1), 3,3′-dimethyl-9-ethyloxacarbocyanine iodide (OC2), and 3,3′,9-triethyl-5,5′-dimethyloxacarbocyanine iodide (OC3) have been studied by the flash photolysis method in solutions and in complexes with DNA. Upon flash photoexcitation, photoisomerization processes were observed for OC1–OC3, and difference absorption spectra of the photoisomers were obtained. The formation of complexes of OC1–OC3 with DNA impedes photoisomerization and leads to an increase in the quantum yield of the triplet state of the dyes. Deactivation of the triplet state follows the two-exponential law, which indicates the possibility to form complexes of two different types. The processes of quenching of OC3 triplet state by oxygen have been studied in solutions and in complexes with DNA.