In the title mol-ecular salt, C(11)H(17)N(2) (+)·Cl(-), the piperazin-1-ium ring adopts a chair conformation with the aromatic ring in a pseudo-equatorial orientation. The dihedral angle between the benzene ring and the mean plane of the piperazin-1-ium ring is 51.22 (6)°. In the crystal, N-H⋯Cl hydrogen bonds link the mol-ecules into chains propagating in [100]. Weak C-H⋯π inter-actions also ocur.
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| http://dx.doi.org/10.1107/S1600536811044394 | DOI Listing |
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Institute of Bioorganic Chemistry, Academy of Sciences of Uzbekistan, M. Ulugbek St 83, Tashkent, 100125, Uzbekistan.
In the title salt [systematic name: 4-(3-carb-oxy-1-ethyl-6-fluoro-4-oxo-1,4-di-hydro-quin-olin-7-yl)piperazin-1-ium nitrate], CHFNO ·NO , proton transfer from nitric acid to the N atom of the piperazine ring of norfloxacin has occurred to form a mol-ecular salt. In the extended structure, N-H⋯O hydrogen bonds link alternating cations and anions into [100] chains, which are reinforced by aromatic π-π stacking inter-actions between the quinoline moieties of the norfloxacinium cations.
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Acta Crystallogr E Crystallogr Commun
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Department of Chemistry, Howard University, 525 College Street NW, Washington DC 20059, USA.
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 (CHNO ·CHO ), 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].
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Acta Crystallogr E Crystallogr Commun
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Faculty of Chemistry, University of Lodz, Pomorska 163/165, 90-236 Łódź, Poland.
The synthesis and crystal structures of the mol-ecular salts of 4-(4-nitro-phen-yl)piperazine with tri-fluoro-acetate, namely, 4-(4-nitro-phen-yl)piperazin-1-ium tri-fluoro-acetate, CHNO ·CFO (I), and with tri-chloro-acetate, namely, 4-(4-nitro-phen-yl)piperazin-1-ium tri-chloro-acetate, CHNO ·CClO , (II), are reported and compared. A partial positional disorder of the anions was found. In both structures, the piperazine rings adopt a chair conformation, whereas the positions of the nitro-phenyl group on the piperazine ring differ from bis-ectional in (I) to equatorial in (II).
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Acta Crystallogr E Crystallogr Commun
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Department of Chemistry, Howard University, 525 College Street NW, Washington DC 20059, USA.
Eleven (4-phen-yl)piperazinium salts containing organic anions have been prepared and structurally characterized, namely, 4-phenyl-piperazin-1-ium 4-fluoro-benzoate monohydrate, CHN ·CHFO ·HO, ; 4-phenyl-piperazin-1-ium 4-bromo-benzoate monohydrate, CHN ·CHBrO ·HO, ; 4-phenyl-piperazin-1-ium 4-iodo-benzoate, CHN ·CHIO , ; 4-phenyl-piperazin-1-ium 4-nitro-benzoate, CHN ·CHNO , ; 4-phenyl-piperazin-1-ium 3,5-di-nitro-salicylate, CHN ·CHNO , ; 4-phenyl-piperazin-1-ium 3,5-di-nitro-benzoate, CHN ·CHNO , ; 4-phenyl-piperazin-1-ium picrate, CHN ·CHNO , ; 4-phenyl-piperazin-1-ium benzoate monohydrate, CHN ·CHO ·HO, ; 4-phenyl-piperazin-1-ium -toluene-sulfonate, CHN ·CHOS, ; 4-phenyl-piperazin-1-ium tartarate monohydrate, CHN ·CHO ·HO, ; and 4-phenyl-piperazin-1-ium fumarate, CHN ·CHO , . Compounds and - are all 1:1 salts with the acid proton transferred to the phenyl-piperaizine basic N atom (the secondary amine) with the exception of where there is disorder in the proton position with it being 68% attached to the base and 32% attached to the acid. Of the structures with similar stoichiometries only and are isomorphous.
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Department of Chemistry, Srimad Andavan Arts and Science College (Autonomous), Tiruchirappalli-620 005, Tamil Nadu, India.
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