Spectral-kinetic and photochemical properties of HITC dye with iodide and perchlorate counterions have been studied in environments where the dye molecules exist in different ionic forms. In ethanol, the dye molecules exist as free ions; in dichlorobenzene, as contact ion pairs. Superfast transformation of non-stationary spectra in an HITC dye bleaching band is found. The observed effects are interpreted within the framework of concepts on “burning out” a notch in the contour of a non-uniformly widened vibronic band of S 0 → S 1-absorption. Qualitative differences in recorded absorption spectra from the dye excited electronic states for weakly and highly polar solvents are found. It is shown that the observed differences are caused by superfast charge transfer in the contact ion pairs that results in the formation of free radicals.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 76, No. 6, pp. 830–838, November–December, 2009.
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Samtsov, M.P., Tikhomirov, S.A., Buganov, O.V. et al. Fast photoprocesses in a symmetric indotricarbocyanine dye (HITC) in solutions. J Appl Spectrosc 76, 783–790 (2009). https://doi.org/10.1007/s10812-010-9284-x
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DOI: https://doi.org/10.1007/s10812-010-9284-x