Dielectric Polarisation of Some Heterocyclic Compounds and Role of π-Electrons in Solution

The dielectric moments at 35 °C of quinoline, pyridine and isoquinoline dissolved in four non-polar solvents viz. benzene, carbon tetrachloride, cyclohexane and dioxane are found to increase in this sequence in accordance with the molecular structure of these solutes. The surprisingly high moments of quinoline and pyridine in carbon tetrachloride indicate the formation of charge transfer complexes in­ volving the π-electron systems of the solutes.

Dielectric Polarisation of Pyridine

This paper deals with the study of dielectric polarisation of pyridine at 35°C in four non polar solvents namely benzene, carbon tetrachloride, dioxan and cyclohexane. The results have been discussed to understand the merits of PALIT equation. It is observed that the moment value μs obtained by this is fairly comparable with that calculated by the method of HALVERSTADT and KUMLER2. The order of apparent dipole moment has been discussed in terms of influence of solvent and solute-solvent interaction as well.