
Acta Crystallographica, Section C: Crystal Structure Communications p. 534 - 537 (2013)
Update date:2022-09-26
Topics:
Smith, Graham
Wermuth, Urs D.
The structures of two ammonium salts of 3-carboxy-4-hydroxybenzenesulfonic acid (5-sulfosalicylic acid, 5-SSA) have been determined at 200 K. In the 1:1 hydrated salt, ammonium 3-carboxy-4-hydroxybenzenesulfonate monohydrate, NH 4+·C7H5O6S -·H2O, (I), the 5-SSA- monoanions give two types of head-to-tail laterally linked cyclic hydrogen-bonding associations, both with graph-set R44(20). The first involves both carboxylic acid O - H···Owater and water O - H···Osulfonate hydrogen bonds at one end, and ammonium N - H···Osulfonate and N - H···Ocarboxy hydrogen bonds at the other. The second association is centrosymmetric, with end linkages through water O - H···Osulfonate hydrogen bonds. These conjoined units form stacks down c and are extended into a three-dimensional framework structure through N - H···O and water O - H···O hydrogen bonds to sulfonate O-atom acceptors. Anhydrous triammonium 3-carboxy-4-hydroxybenzenesulfonate 3-carboxylato-4- hydroxybenzenesulfonate, 3NH4+·C7H 4O6S2-·C7H5O 6S-, (II), is unusual, having both dianionic 5-SSA 2- and monoanionic 5-SSA- species. These are linked by a carboxylic acid O - H···O hydrogen bond and, together with the three ammonium cations (two on general sites and the third comprising two independent half-cations lying on crystallographic twofold rotation axes), give a pseudo-centrosymmetric asymmetric unit. Cation-anion hydrogen bonding within this layered unit involves a cyclic R3 3(8) association which, together with extensive peripheral N - H···O hydrogen bonding involving both sulfonate and carboxy/carboxylate acceptors, gives a three-dimensional framework structure. This work further demonstrates the utility of the 5-SSA- monoanion for the generation of stable hydrogen-bonded crystalline materials, and provides the structure of a dianionic 5-SSA2- species of which there are only a few examples in the crystallographic literature.
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