SOLVATOCHROMISM OF DYES .3. SOLVATOCHROMISM OF MEROCYANINES IN SOME BINARY-MIXTURES OF SOLVENTS - SA-SAB-SB, A NEW MODEL OF SOLVATOCHROMISM

A quantitative model of solvatochromism in a binary solvent system is presented. Although it is derived for merocyanine and betaine dyes, it explains a majority of known examples of solvatochromism in binary so lvents. The model provides an estimation of equilibrium constants betw een particular types of solvates present therein. UV-VIS absorption sp ectra of solvated species can be simulated. They perfectly fit the exp erimental data. The model proposed describes the internal solvent pict ure from the solute point of view, which differs from other known mode ls and may be useful for studying the structure of liquids. (C) 1997 J ohn Wiley & Sons, Ltd.