Acta Cryst. (2009). E65, o2110  [ doi:10.1107/S1600536809030396 ]

8-Ammonionaphthalene-2-sulfonate monohydrate: the zwitterionic hydrate of 1,7-Cleve's acid

G. Smith, U. D. Wermuth and D. J. Young

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 R₃³(8) O-HO and N-HO intermolecular hydrogen-bonding interactions, forming chains which extend down the a axis of the unit cell. Additional peripheral associations, including weak aromatic ring - interactions [centroid-centroid distance = 3.6299 (15) Å], result in a two-dimensional sheet structure.

Online 8 August 2009

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