Structural investigations of nickel(II) complexes. Part I. Crystal structure of bisaquotetrakisquinolinedithiocyanatenickel(II) complex

Abstract

The green crystals of Ni(NCS)2(qn)4(H2O)2 are of triclinic symmetry with the space group P1 and the dimensions of the unit cell: a = 12.502(8), b = 8.966(8), c = 7.558(4) Å, α = 95.69(6), β = 92.58(5), γ = 92.18(7)° and V = 841(1) Å3, the number of formula units being Z = 1. The structure was refined by the method of full matrix least squares, the final value of R was 0.073. The nickel atoms lie in the centre of the symmetry and are pseudooctahedrally coordinated by four N atoms (two of the NCS groups, NiN = 2.04 Å, and two from the quinoline molecules, NiN = 2.18 Å) and two O atoms (from the water molecules, NiO = 2.13 Å). The bond angles in the coordination polyhedra are near to 90°. Two other quinoline molecules form hydrogen bridges with the coordinated water molecules. The thiocyanate group is a monodentate ligand and is nearly linear with the interatomic distances of NC = 1.16 and CS = 1.62 Å. The quinoline molecules are planar and exhibit the interatomic distances of CN of 1.32 to 1.37 Å and CC of 1.32 to 1.47 Å.