Crystal structure of dichlorido(2,2′:6′,2′′-terpyridine-κ3N,N′,N′′)zinc: a redetermination

Abstract

The crystal structure of the title compound, [ZnCl2(C15H11N3)], was redetermined based on modern CCD data. In comparison with the previous determination from photographic film data [Corbridge & Cox (1956).J. Chem. Soc.159, 594–603; Einstein & Penfold (1966).Acta Cryst.20, 924–926], all non-H atoms were refined with anisotropic displacement parameters, leading to a much higher precision in terms of bond lengths and angles [e.g.Zn—Cl = 2.2684 (8) and 2.2883 (11) compared to 2.25 (1) and 2.27 (1) Å]. In the title molecule, the ZnIIatom is five-coordinated in a distorted square-pyramidal mode by two Cl atoms and by the three N atoms from the 2,2′:6′,2′′-terpyridine ligand. The latter is not planar and shows dihedral angles between the least-squares planes of the central pyridine ring and the terminal rings of 3.18 (8) and 6.36 (9)°. The molecules in the crystal structure pack with π–π interactions [centroid–centroid distance = 3.655 (2) Å] between pyridine rings of neighbouring terpyridine moieties. These, together with intermolecular C—H...Cl interactions, stablize the three-dimensional structure.