Dielectric behaviour of aprotic polar liquid dissolved in non-polar solvent under static and high frequency electric field

Abstract

175-183Dielectric behaviour of aprotic polar liquids (j) like N,N dimethylformamide (DMF), N,N dimethylacetamide (DMA) and acetone (Ac) has been studied under static as well as 9.987, 9.88 and 9.174 GHz electric field employing Debye theory of polar-non polar liquid mixture in terms of measured ε'ij and imaginary ε"ij part of complex relative permittivity εij*, static ε0ij and high frequency ε∞ij for different wj’s of solute dissolved in non polar solvent at 27°C temperature. Double relaxation times τ2 and τ1 due to whole molecule and part of the polar molecule have also been estimated analytically using the complex high frequency orientational susceptibility ij* (= εij*-ε∞ij) from measured data for DMF and DMA in C6H6 and CCl4 as well as acetone in C6H6 and CCl4 solvent, respectively at 27°C. Out of the six systems, three systems show double relaxation time τ2 and τ1 and dipole moment μ2 and μ1. The estimated μ’s and τ’s agree excellently well with the reported and measured values from ratio of slope and linear slope method. The dipole moments μ0s’s in static electric field are also compared with μj’s in hf method. The relative contributions c1 and c2 due to τ1 and τ2 have been calculated from Fröhlich equation as well as graphical plot of 'ij/0ij -wj and ''ij/0ij -wj curve at wj→0. Solute-solute and solute-solvent molecular associations are ascertained in different molecular environment