Syntheses, crystal structures and Hirshfeld surface analysis of three salts of 1-(4-nitro-phenyl)-piperazine

• Published in: Acta crystallographica. Section E, Crystallographic communications Vol. 79; no. Pt 4; pp. 373 - 379
• Main Authors: Archana, Sreeramapura D, Foro, Sabine, Yathirajan, Hemmige S, Kiran Kumar, Haruvegowda, Balerao, Rishik, Butcher, Ray J
• Format: Journal Article
• Language: English
• Published: England International Union of Crystallography 01.04.2023
• Subjects: axial and equatorial substitution patterns in piperazinium rings; crystal structure; graph-set notation; hirshfeld surface analysis; piperazinium salt; Research Communications; salicylate; crystal structure; piperazinium salt; Hirshfeld surface analysis; graph-set notation; axial and equatorial substitution patterns in piperazinium rings; salicylate
• ISSN: 2056-9890; 2056-9890
• DOI: 10.1107/S2056989023002517

The structures and Hirshfeld surface analysis of three salts of 1-(4-nitro-phenyl)-piperazine are discussed. In 4-(4-nitro-phen-yl)piperazin-1-ium salicylate (C H N O ·C H O ), there are strong hydrogen bonds between cation and anion and the 4-nitro-phenyl substituent occupies an equatorial position in the piperazinium ring. The cation and anion are linked together by supra-molecular inter-actions [graph-set notation of hydrogen bonding (6) propagating in the -axis direction]. Additionally, there is π-π stacking involving the salicylate anion and the piperazinium cation in adjacent asymmetric units as well as a C-H⋯π inter-action between a hydrogen atom on the piperazine ring and the phenyl ring within the salicyclate anion. In bis-[4-(4-nitro-phen-yl)piperazin-1-ium] bis-(4-fluoro-benzoate) trihydrate (2C H N O ·2C H FO ·3H O), there are two cations, two anions, and three water mol-ecules of solvation in the asymmetric unit, all linked by hydrogen bonds [graph-set notation of hydrogen bonding (20) between adjacent cations and (9) between a cation and its adjacent anion]. In the anion, the 4-nitro-phenyl ring occupies an axial substitution position in the piperazinium ring, which is relatively rare. Within the asymmetric unit, the phenyl groups in the cations show an offset π-π inter-action. Additionally, there is a C-H⋯π inter-action between a hydrogen atom on the phenyl ring within a cation and the phenyl ring within an anion. In 4-(4-nitro-phen-yl)piperazin-1-ium 3,5-di-nitro-benzoate (C H N O ·C H N O ), there is a strong N-H⋯O hydrogen bond linking the cation and anion and the 4-nitro-phenyl ring occupies an axial substitution position in the piperazinium ring, as seen in the previous structure. In the crystal, the cation and the anion form a complex three-dimensional hydrogen-bonded array involving (8), (12) and (20) rings propogating in the -axis direction. The nitro-phenyl group is disordered with occupancies of 0.806 (10) and 0.194 (10).