Abstract

It was shown in a last decade that fluctuations of solvent microstructure plays important role in spectroscopy of dye solutions [1]. Nevertheless very little is known on the microstructure fluctuations of binary solvents though such solvents are of a great importance particularly in chemistry and biology. In spite of numerous investigations of atomic ions in binary solvents there is practically no information on the heterogeneity of such media caused by fluctuations of microstructure. In this work Rhodamine 6G was used as a fluorescent probe for investigation of microstructure fluctuations of aqueous-alcohol mixtures at different ratio of components. In particular the variation of solution microviscosity was determined by measurement of rotational diffusion time (τ_r) of the probe.

© 1998 IEEE