4-(2-Methoxyphenyl)piperazin-1-ium 6-chloro-5-isopropyl-2,4-dioxopyrimidin- 1-ide

Abstract

In the cation of the title salt, C11H17N 2O+·C7H8ClN2O 2-, the piperazine ring adopts a distorted chair conformation and contains a positively charged N atom with quaternary character. Its mean plane makes a dihedral angle of 42.36 (8)° with the phenyl ring of its 2-methoxyphenyl substituent. The 2,4-dioxopyrimidin-1-ide anion is generated by deprotonation of the N atom at the 1-position of the pyrimidinedione ring. Intramolecular C - H⋯O hydrogen bonds generate S(6) ring motifs in both the cation and the anion. In the crystal, N - H⋯O, N - H⋯N and C - H⋯O hydrogen bonds are also observed, resulting in a two-dimensional network parallel to the ab plane. The crystal stability is further consolidated by weak C - H⋯π interactions.