Crystal and molecular structure of bis[(acetato)aquo(pyridine)]nickel(II)

Abstract

Crystals of the title compound are orthorhombic, space group Pbca, Z= 4, a= 8·938(3), b= 14·983(6), c= 12·599(5)Å. The molecular structure was solved from diffractometer data by Fourier techniques, and refined by least-squares methods to R 0·08 for 865 independent reflections. It consists of a centrosymmetric monomer with the nickel(II) ion octahedrally co-ordinated by the pyridine and water ligands and by two unidentate acetate groups. Hydrogen bonds link the unco-ordinated oxygen atoms of the acetate ions to water molecules in the same and neighbouring molecules. Ni–N Is 2·100, Ni–O(water) 2·102, Ni–O(AcO) 2·050 Å. The angles around the nickel atom are all ca. 90°. The nickel–ligand bond lengths are compared to those in related six-co-ordinate nickel(II) complexes.