Composition- dependent dynamical structures or binary mixtures of mono alkyl ethers of ethylene glycol with some polar solvents determined by microwave dielectric relaxation measurements

Abstract

The formation of H-bond heterogeneous structures and their dynamics in the binary mixtures of the homologous series of mono alkyl ethers of ethylene glycol with glycerol (Gly), Dimethyl sulphoxide (DMSO) and dimethyl formamide (DMF) have been investigated from dielectric constant and microwave dielectric relaxation measurements at 25^oC using Time Domain

Reflectometry technique. The concentration dependent values of dielectric constant ant and relaxation time of ethers-Gly mixtures indicate a strong H-bond heterogeneous interaction between the hydroxyl groups of the molecules, and these interactions significantly facilitate the molecular dynamics in the binary mixture, as compared to the dynamics of pure Gly molecules. The dielectric relaxation values of ethers-DMSO and ethers-DMFalso confirm the complex formation in these systems over the entire concentration range. Further, the effect of moleculer size of the ether molecules on the nature of

heterogeneous interaction with different polar solvents and hindrance to the molecular dynamics in the binary mixtures has been recognised from the comparative values of measured dielectric parameters.