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Effect of viscosity on the singlet-excited state dynamics of some hemicyanine dyes

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Photophysical properties of hemicyanine dyes (1 - 3) were investigated in solvents of varying polarity and viscosity. Hemicyanines possess relatively low fluorescence quantum yields (≤1%) in polar solvents. A significant increase in fluorescence quantum yield and lifetimes was observed with increase in viscosity of the solvent medium. The radiative, as well as nonradiative decay channels from the singlet-excited state were investigated by varying the viscosity of the medium. The viscosity-dependent radiationless relaxation observed in hemicyanine dyes is suggestive of a restricted rotor motion in the singlet excited state.

10.1163/156856703764929958
/content/journals/10.1163/156856703764929958
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/content/journals/10.1163/156856703764929958
2003-04-01
2016-12-10

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