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Hydro­gen-bonding patterns in cis-4-ammonio­cyclo­hexane­carboxyl­ate hemihydrate

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In the title compound, C7H13NO2·0.5H2O, cis-4-amino­cyclo­hexane­carboxylic acid exists as a zwitterion and co-crystallizes with water mol­ecules in a 2:1 amino acid–water ratio. The cyclo­hexane ring adopts a chair conformation, with the carboxyl­ate and ammonium groups in axial and equatorial positions, respectively. The basic motif in the crystal structure is a sandwich structure, formed by two amino acid units linked by head-to-tail hydrogen bonds. Hydro­gen bonds of the type N+—H…O—C—O link these motifs, forming helicoidally extended chains running along the c axis. The water molecule lies on a twofold axis and interacts with the chains by means of O—H…O hydrogen bonds.

Document Type: Research Article


Publication date: 2004-10-01

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