Pseudo-halide complexes of transition metals. Part I. Synthesis and properties of cobalt(II), nickel(II), copper(II), and zinc(II) derivatives

Abstract

A series of anionic four-co-ordinate complexes of bivalent cobalt, nickel, copper, and zinc have been prepared from a number of organic pseudo-halide anions, e.g. pentafluoro- and pentachloro-phenoxide, thioacetate, pentafluorobenzenethiolate, benzenethiolate, and (2,4,6-trichlorophenyl)- and (2-chlorophenyl)-carbodi-imide anions.

The complex anions were isolated as salts with a large cation. The physical properties of the compounds are reported, including magnetic moments, and u.v. and visible spectral data. The position of the ligands in both the spectrochemical and nephelauxetic series is compared with those of the simple halide ions. All the ligands show values of the parameter 10Dq larger than that for the three halide ions but smaller than for the NCO^– or NCS^– ions. The nephelauxetic B values show less regularity.