Molecular polarizability of organic compounds and their complexes: LIII. Molar volumes in solutions and steric structure of molecules of polyaryl compounds with bridging groups containing sp 2-and sp 3-hybridized carbon

Abstract

The molar volumes of polyphenylmethanes, polyarylethanes, polyaryl compounds based on pyridinium cations, polyarylethylenes, and also diaryl and hetaryl ketones in various solvents were determined. Additive analysis of the molar volumes of these compounds showed that the aryl rings in their molecules are acoplanar to the bridging groups in which these rings can rotate about single bonds. The most probable is the conrotatory model of mutual orientation of the aromatic rings relative to each other. This orientation is similar to that found previously in solutions of such molecules as diphenylmethane, benzophenone, and some others, according to data of various physical methods. The possibility of substantial simplification of methods for determining the dipole moments, Cotton-Mouton constants, and Kerr constants for the compounds under consideration was demonstrated.