Abstract
We present a solvation dynamics study of Rhodamine 700 in the isotropic phase of octylcyanobiphenyl approaching the nematic-isotropic phase transition. From our experiments we detect two kinds of processes. A fast process, with decay time constants of tens of ps, shows no clear temperature dependence and is attributed to local reorientational motion of the solvent in the proximity of the chromophore. A slow process, with time constants in the hundreds of ps, shows a temperature activated behavior. This process does not seem to be influenced by the molecular order displayed by nematogenic substances and resembles the solvation dynamics behavior observed in simple polar liquids and predicted by dielectric theories.
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