Crystal structure of S-n-octyl 3-(1-phenyl-ethyl-idene)di-thio-carbazate and of its bis-chelated nickel(II) complex.

The nitro-gen-sulfur Schiff base proligand S-n-octyl 3-(1-phenyl-ethyl-idene)di-thio-carbazate, C(17)H(26)N(2)S(2) (HL), was prepared by reaction of S-octyl di-thio-carbamate with aceto-phenone. Treatment of HL with nickel acetate yielded the complex bis-[S-n-octyl 3-(1-phenyl-ethyl-idene)di-thio-carbazato]nickel(II), [Ni(C(17)H(25)N(2)S(2))(2)] (NiL (2)), which was shown to adopt a tetra-hedrally distorted cis-square-planar coordination geometry, with the NiSN planes of the two ligands forming a dihedral angle of 21.66†(6)°. Changes in the geometry of the L ligand upon chelation of Ni(2+) are described, involving a ca 180° rotation around the N(azomethine)-C(thiol-ate) bond.