Crystal structures of azido or thiocyanato-coordinated nickel(II) complexes with tridentate Schiff bases

Abstract

A new azido-coordinated nickel(II) complex [NiL1(N3)] (1) and a new thiocyanato-coordinated nickel(II) complex [NiL2(NCS)] (2), where L1 and L2 are the monoanionic forms of Schiff bases 2-[(2-isopropylaminoethylimino)methyl]-6-methylphenol and 2-[(2-dimethlaminoethylimino)methyl]-6-methylphenol respectively, are prepared and structurally characterized by elemental analysis, IR spectra, and single crystal X-ray crystallography. Complex 1 crystallizes in the triclinic space group P-1 with unit cell dimensions a = 8.812(2) A, b = 9.433(3) A, c = 9.488(2) A, α = 81.933(2)°, β = 69.925(2)°, γ = 84.591(2)°, V = 732.5(3) A3, Z = 2, R1 = 0.0291, and wR2 = 0.0734. Complex 2 crystallizes in the monoclinic space group P21/n with unit cell dimensions a = 7.4497(4) A, b = 6.1933(3) A, c = 31.5126(18) A, β = 92.484(2)°, V = 1452.57(13) A3, Z = 4, R1 = 0.0307, and wR2 = 0.0668. The Ni atom in each of the complexes is coordinated by three donor atoms of the Schiff base ligand and by one N atom of the azide or thiocyanate ligand, forming a square planar geometry. The azide and thiocyanate anions readily coordinate to the complexes as secondary ligands.