Abstract
Using the steady-state spectroscopic technique, we have studied the spectroscopic properties of methyl p-dimethylaminobenzoate and its ortho derivative in binary mixture where one of components is capable to form hydrogen bonds with the solute molecules. Non-linear solvatochromic shifts of the absorption, locally excited (LE) and intramolecular charge transfer (ICT) fluorescence bands are observed for both fluorophores. This non-linearity has been explained as due to three main causes: non-ideal behavior of the solvent mixture, specific solute–solvent association, and dielectric enrichment of the solvent around the polar solutes. The results of spectroscopic measurements were used to calculate, according to Mazurenko’s, Bakhshiev’s and Kiselev’s theories, the free energy of the reorientational interaction for a studied molecules, the number of more polar solvent molecules involved in the first solvation shell and the fluorescence spectra of solvates having different number of more polar component in the first solvation shell.
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