Adducts of transition metal complexes with redox-active ligands: the structure and spin-state-switching rearrangements

Abstract

The currently available literature data on the synthesis, molecular and electronic structure of mixed-ligand complexes (adducts) of transition metals (chromium, manganese, iron, cobalt, ruthenium) with organic redox-active ligands are systematically considered for the first time. The possibility of manifestation of magnetic bistability by adducts of tetracoordinate CoII and FeII complexes and the potential for their application as molecular switches are studied in detail by means of quantum chemical modelling of thermally initiated rearrangements controlled by the spin crossover and valence tautomerism mechanisms. Special attention is given to dinuclear adducts of CoII and FeII complexes with linearly bonded and polycyclic di-o-quinones and their imines, which can operate as thermally switchable elements of quantum computers suitable for practical implementation of two-qubit gates. The bibliography includes 183 references.