Abstract
The photophysics of bisdimethylaminoheptamethine perchlorate dissolved in a series of alcohols has been studied. The absorption difference spectrum ΔD(λ,t) exhibits S1-Sn absorption, S0-S1 band bleaching, induced fluorescence and, after a delay upon optical excitation, photoisomer absorption. The S1 state depletion proceeds exponentially. GSR curves indicate a number of non-relaxed molecules which undergo photoisomerization. Photoisomer formation was evidenced by an increasing photoisomer absorption. All processes proceed more slowly in more viscous solvents. The isomerization quantum yield is found to be independent of solvent viscosity.
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