The crystal structure of bis(2-pyridylthio)methanediiodozinc(II), [ZnI2(bpytm)]

The crystal structure consists of discrete [Znl(2)(bpytm)] units where the Zn atom is in the centre of distorted tetrahedral arrangement of two I atoms, and two N atoms of the bpytm ligand which is N-N' bidentate and forms an eight-membered chelate ring. The Zn-N lenghts of 2.060(4) Angstrom and 2.061(4) Angstrom and Zn-1 of 2.6045(7) and 2.5773(7) Angstrom are almost identical to the values found in the CCDC for tetrahedrally coordinated Znl2 species with N-donor ligands. Since the sum of the van der Waals radii for Zn and S is 3.20 Angstrom [3], the Zn-S distances [3.2156(17) and 3.3146(14) Angstrom] rules out significant interaction between the metal and thioether S atoms.