Coordination Chemistry and Magnetic Properties of Bi- and Polynuclear Exchange-Coupled Cu(II) and Ni(II) Metal Oximates

This review is an attempt to describe the potential of magnetochemical approach for describing the structure and properties of bi- and polynuclear metal chelates based on coordination compounds with a limited number of ligand types, mainly oxime-containing azomethines and their analogues. The review systematically addresses the published data on bi- and polynuclear copper(II) and nickel(II) complexes in which the paramagnetic centers are coupled by both intra- and intermolecular exchange interactions. Within the limited analysis, the main types and mechanisms of exchange interactions are considered and some electronic and geometric factors that determine the magnetic properties of bi- and polynuclear copper(II) and nickel(II) complexes with oximate ligands are identified. The relationship between electronic and geometric features of the complexes and the nature of exchange effects are considered, and an attempt is made to systematize the magneto-structural correlations in the discussed compounds, which are important model objects for developing a strategy for targeted design of one-, two-, and three-dimensional magnetically ordered structures.