Abstract

Using a femtosecond pump-probe laser system, the excited-state lifetimes of cis-stilbene in n-hexane, tetradecane, methanol, 1,4-dioxane, and cyclohexane are measured and correlated with solvent bulk viscosity. The measured lifetimes in n-hexane and tetradecane correlate well to solvent bulk viscosity, but methanol, 1,4-dioxane, and cyclohexane do not. Polarity-influenced solvent-solute interactions occur in methanol and 1,4-dioxane and a slow isomerization rate in cyclohexane occurs with cis-stilbene. 39 refs., 7 figs., 2 tabs.

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