Graham Smith, U. Wermuth, D. Young
Aug 8, 2009
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Acta Crystallographica Section E: Structure Reports Online
Abstract
The structure of 8-amino-2-naphthalenesulfonic acid monohydrate (1,7-Cleve’s acid hydrate), C10H9NO3S·H2O, shows the presence of a sulfonate–aminium group zwitterion, both groups and the water molecule of solvation giving cyclic R 3 3(8) O—H⋯O and N—H⋯O intermolecular hydrogen-bonding interactions, forming chains which extend down the a axis of the unit cell. Additional peripheral associations, including weak aromatic ring π–π interactions [centroid–centroid distance = 3.6299 (15) Å], result in a two-dimensional sheet structure.