Abstract
The crystal structures of sodium 4-amino-2-hydroxybenzoate dihydrate [NaL·2H2O, L = C6H3(NH2)(OH)COO] and potassium 2-aminobenzoate monohydrate [KL*·H2O, L* = C6H4(NH2)COO] were determined by X-ray diffraction methods. The compound NaL·2H2O crystallizes in the monoclinic system, space group P21/c with a = 8.820(2), b = 14.632(3), c = 6.948(2) Å, β = 97.88(3)°. The structure consists of sodium ion pairs joined together by tridentate 4-amino-2-hydroxybenzoate moieties creating a polymeric chain. In the metal centres, two water molecules bridge the sodium atoms. Five oxygen atoms and one nitrogen atom form a distorted octahedral environment. The compound KL*·H2O crystallizes in the monoclinic system, space group P21/c with a = 14.684(3), b = 7.618(2), c = 7.512(2) Å, β = 96.95(3)°. The structure consists of octacoordinated potassium atoms bonded with three water molecules and five carboxylate oxygen atoms. Water molecules appear as bridging ligands. The 2-aminobenzoate ligand acts as a pentadentate ligand with the molecular network stabilized by hydrogen bonds. Among the polymeric chains in both structures appear noncovalent interactions of type N−H···X.
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