Crystal structure of a 3D coordination polymer: Zinc terephthalate hydrate

The crystallography shows that zinc atom in the title complex is five-coordinated by four oxygen atoms from four carboxylic groups, that define a plane, and one oxygen atom of water molecule that occupies an apical position in the square pyramidal geometry. The Zn-O3 (water) bond lies on C2 axis (b axis of the crystal) while the four terephthalates stretch out to four directions in C2 symmetry. The pair of zinc atoms, bridged by two of carboxylic groups, forms a binuclear unit. Connections between these units lead to the formation of an infinite 1D zigzag chain along c axis, which, joined via zinc atoms, generates a 3D network.