Arylamine co-ordination complexes. Part V. Electronic spectra of complexes of nickel(II) perchlorate and halide, with substituted anilines

Abstract

The diffuse reflectance electronic spectra are discussed for complexes of the type trans-[Ni(amine)₄X₂](amine = substituted anilines, X = ClO₄, Br, or I). At room temperature splittings of the first spin-allowed electronic absorption band are recorded, and at liquid-nitrogen temperatures some examples of splittings of the second d–d band are also observed. The axial crystal-field parameters Dq^z, for the perchlorate and iodide ions, are not constant throughout the series of complexes but generally decrease as the planar fields 10Dq^xy, due to the aniline ligands, increase.