Effect of Molecular Structure on the Molecular Interactions of Some Binary Mixtures of Sulfolane: a Photophysical Study.

Abstract

The shape and intensity of the sulfolane fluorescence spectra in its binary
mixture with six solvents ; + DMSO , +acetone ( Ac) , + N,N-dimethylformamid
(DMFA) , + ethylene glycol(EG) ,+methoxy ethanol(MEOH) and ethoxy ehtanol
(EEOH) were studied using fluorescence quenching technique. All the solvents ,except
DMFA,quenched sulfolane fluorescence emission.The main contribution to the
quenching process might be due to the hydrogen bonding molecular interaction which
have stronger forces to associate the unlike molecules than that for the like molecules.The
quenching efficiency is dependent on the solvent structure . DMFA solvent has different
behavior whearby it increase sulfolane fluorescence intensity by increasing solvent
concentration. Changing the hydrogen atom in the ethylene glycol by a methyl group
results in the decreasing of the quenching efficiency of sulfolane fluorescence. The
quenching processes were almost having a static pattern.