The crystal structure of chloropentamethylbenzene

Abstract

Crystals of chloropentamethylbenzene are monoclinic, a= 8·92, b= 7·29, c= 8·84 Å, β= 119·84°, space group P2₁/m, Z= 2. The crystal exhibits an orientational disorder, the chlorine atom and the methyl groups being distributed in six possible positions. The arrangement is not however completely random, the chlorine showing a preference for three of the six positions. The observed disorder, and other physico-chemical data, can be interpreted in terms of discontinuous molecular reorientations.