A second monoclinic polymorph of N-(diethylaminothiocarbonyl)-N′- phenylbenzamidine

Abstract

The asymmetric unit of the title compound, C18H 21N3S, contains five molecules. The equivalent bond distances in the five molecules are in excellent agreement, the r.m.s. fit being within 0.007 Å. The five molecules are linked into a chain consisting of alternating pseudo-enanti-omers by N - H⋯S hydrogen bonds supplemented by weak C - H⋯π interactions. The action of a glide plane links the asymmetric unit into an extended chain. A polymorph of the title compound with one mol-ecule in the asymmetric unit was reported by Braun et al. [Cryst. Res. Technol. (1988), 23, 35-39].