Crystal structures of tetrakis(pyridine-4-thioamide-κN)bis(thiocyanato-κN)cobalt(II) monohydrate and bis(pyridine-4-thioamide-κN)bis(thiocyanato-κN)zinc(II)

Abstract

Reaction of Co(NCS)2 and Zn(NCS)2 with 4-pyridinethioamide led to the formation of compounds with composition [Co(NCS)2(C6H6N2S)4]·H2O (1) and [Zn(NCS)2(C6H6N2S)2] (2), respectively. The asymmetric unit of compound 1, consists of one cobalt(II) cation, two thiocyanate anions, four 4-pyridinethioamide ligands and one water molecule whereas that of compound 2 comprises one zinc(II) cation that is located on a twofold rotation axis as well as one thiocyanate anion and one 4-pyridinethioamide ligand in general positions. In the structure of compound 1, the cobalt(II) cations are octahedrally coordinated by two terminal N-bonding thiocyanate anions and by the N atoms of four 4-pyridinethioamide ligands, resulting in discrete and slightly distorted octahedral complexes. These complexes are linked into a three-dimensional network via intermolecular N—H...S hydrogen bonding between the amino H atoms and the thiocyanate S atoms. From this arrangement, channels are formed in which the water molecules are embedded and linked to the host structure by intermolecular O—H...S and N—H...O hydrogen bonding. In the structure of compound 2, the zinc(II) cations are tetrahedrally coordinated by two N-bonding thiocyanate anions and the N atoms of two 4-pyridinethioamide ligands into discrete complexes. These complexes are likewise connected into a three-dimensional network by intermolecular N—H...S hydrogen bonding between the amino H atoms and the thioamide S atoms.