The properties of nitritobis(ethylenediamine)nickelate(II) halides

Abstract

The properties of a series of complexes [Ni(en)₂(ONO)]X, where X = Cl^–, Br^–, or I^–, have been examined and compared with complexes of known crystal structure where X = NO₂^–, ClO₄^–, or BF₄^–. The magnetic data for the halide complexes indicate, a ³A_2g ground state for the nickel(II) ion in a magnetically dilute, essentially octahedral environment. The electronic spectra suggest a trans-octahedral configuration for the nickel ion with no evidence that the halide ions are co-ordinated. The electronic and infrared spectra are consistent with a symmetrically bridging nitrito-group.