RESUMO
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 â¶). J. Chem. Soc. 159, 594-603; Einstein & Penfold (1966 â¶). 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 = 2.2684â (8) and 2.2883â (11) compared to 2.25â (1) and 2.27â (1)â Å]. In the title mol-ecule, the Zn(II) atom 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 3.18â (8) and 6.36â (9)°. The mol-ecules in the crystal structure pack with π-π inter-actions [centroid-centroid distance = 3.655â (2)â Å] between pyridine rings of neighbouring terpyridine moieties. These, together with inter-molecular C-Hâ¯Cl inter-actions, stablize the three-dimensional structure.