Conformation of thianthren and 2,7-dichlorothianthren partially oriented in a nematic phase

Abstract

The ¹H n.m.r. spectra of thianthren and 2,7-dichlorothianthren dissolved in the Merck Nematic Phase IV were analysed and the structural parameters obtained. These molecules in solution adopt a folded conformation about the axis connecting the two sulphur heteroatoms. The angle of folding is 140.6° for thianthren and 139.8° for 2,7-dichlorothianthren. The correspondent standard deviations are ±0.4 and ±0.7°, respectively.