Crystal structures of dichlorotetrakis(acetaldoxime)nickel(II) and tetrakis(acetamide)bisaquonickel(II) dichloride

Abstract

The crystal structures of NiCl₂(acetaldoxime)₄(I) and NiCl₂(acetamide)₄,2(H₂O)(II) have been determined by three-dimensional X-ray methods. Both complexes crystallize in the space group P2₁/c with lattice constants: (I)a= 7·496(3), b= 12·312(5), c= 9·063(6)Å, β= 97·73(4)°; and (II)a= 6·72(2), b= 14·004(3), c= 9·482(3)Å, β= 102·47(1)°. Diffractometer data were refined by full-matrix anisotropic methods to R 0·035 (I; 1904 reflections) and 0·033 (II; 2018 reflections). In (I) each Ni atom is co-ordinated to four acetaldoxime ligands and two trans Cl atoms, intermolecular interactions being weak. In (II) each Ni is bonded to four organic ligands and two trans water molecules; the Cl atoms lie outside the co-ordination spheres but are involved in strong hydrogen bonding, linking adjacent molecules.