Crystal structure studies and Hirshfeld surface analysis of 4-(dimethylazaniumyl)-2-hydroxyanilinium dichloride monohydrate at 90 K

Abstract

The crystal structure and a Hirshfeld surface analysis of the substituted anilinium salt 4-(dimethylazaniumyl)-2-hydroxyanilinium dichloride monohydrate, C8H14N2O+·2Cl−·H2O, at low temperature (90 K) are presented. The organic cation is essentially planar: the r.m.s. deviation of its non-hydrogen atoms (aside from the two methyl groups) is 0.0045 Å. The methyl carbons are 1.3125 (12) Å and 1.1278 (12) Å either side of the mean plane. The crystal packing involves extensive hydrogen bonding of types O—H...Cl, N—H...Cl, N—H...OW, and OW—HW...Cl (where W = water), which arrange into chains of R 2 4(12) motifs that combine to form corrugated layers parallel to (10\overline{1}). Atom–atom contacts for the cation primarily involve hydrogen, leading to the most abundant coverage percentages being 51.3% (H...H), 23.0% (H...Cl), 12.9% (H...O), and 9.7% (C...H).