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- W2036993287 abstract "Relaxation times τ were determined for 4,5-benzindo- and thiapentacarbocyanines with the CH3C6H4SO3−, I−, CF3SO3−, CIO4−, CF3COO− and BF4− anions absorbing in the 1060 nm range in dichloroethane, ethanol and polymer films of poly(methyl methacrylate) and poly(vinyl butyral). It is shown that τ is independent of the anion in polar but not in weakly polar media. On the basis of Hückel calculations of the charge distribution in the dye cations and analysis of their spectral and luminescent properties, it was determined that the effect of the anion on τ in weakly polar media is due to the formation of ion pairs. An increase in the nucleophilicity of both the anion and the solvent results in a decrease in τ. Possible mechanisms for the degradation of electronic excitation energy in dye ion pairs is considered." @default.
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- W2036993287 date "1988-02-01" @default.
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- W2036993287 title "The influence of the anion on the excited-state relaxation time of cationic polymethine dyes" @default.
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- W2036993287 doi "https://doi.org/10.1016/0009-2614(88)87097-0" @default.
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