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In the title compound, {[Zn2(C9H3O6)(OH)(H2O)]·0.5H2O}n, there are three independent ZnII atoms present; two are located on special positions, viz a twofold rotation axis and an inversion centre, and the third is located in a general position. The ZnII atom on the inversion centre is six-coordinated by four O atoms from four different benzene-1,2,3-tricarboxyl­ate anions and two OH anions. The ZnII atom located on a twofold axis is four coordinated by two O atoms from two different benzene-1,2,3-tricarboxyl­ate anions and two OH anions. The third ZnII atom, located in a general position, is five coordinated by three O atoms from three different benzene-1,2,3-tricarboxyl­ate anions, one OH anion and one water mol­ecule. Each benzene-1,2,3-tricarboxyl­ate anion bridges six ZnII atoms, and the OH anion bridges three ZnII atoms, resulting in the formation of a three-dimensional framework. A series of O—H...O hydrogen bonds involving the benzene-1,2,3-tricarboxyl­ate anions, the OH anion and the coordinating and the two water solvent mol­ecules further stablize the crystal structure. The two solvent water molecules show occupancies of 0.5 and 0.25.

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In the title compound, [K2(C8H6N3O2)2(H2O)]n, each K+ ion is seven-coordinated by one O atom from a bridging water mol­ecule, five carboxyl­ate O atoms and one N atom from a benzotriazole group, forming a distorted mono-capped octa­hedral geometry. In the crystal, the carboxyl­ate groups act as bridging ligands, forming a two-dimensional polymer parallel to (001). The aqua ligand, which lies on a twofold rotation axis, forms inter­molecular O—H...O hydrogen bonds within these layers.
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