Heteroligand Metal Complexes with Extended Redox Properties Based on Redox-Active Chelating Ligands of o-Quinone Type and Ferrocene

Abstract

A combination of different types of redox-active systems in one molecule makes it possible to create coordination compounds with extended redox abilities, combining molecular and electronic structures determined by the features of intra- and intermolecular interactions between such redox-active centres. This review summarizes and analyses information from the literature, published mainly from 2000 to the present, on the methods of preparation, the molecular and electronic structure of mixed-ligand coordination compounds based on redox-active ligands of the o-benzoquinone type and ferrocenes, ferrocene-containing ligands, the features of their redox properties, and some chemical behaviour.

Low-Coordinate Mixed Ligand NacNac Complexes of Rare Earth Metals

“…The most distinctive feature of redox active ligands (e.g., o-iminoquinones and alpha-diimines) is the possibility of their redox transformations in the metal coordination sphere, which extends their reactivity to a great extent [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. For a long time, o-iminoquinonato ligands have been used in the coordination chemistry of transition metals and a wide range of complexes have been synthesized to date [ 23 , 24 , 25 ].…”

Derivatives of penta-, hexa-, and hepta-coordinated tin with Schiff bases and 1,10-phenanthroline: structure, redox and optoelectronic properties

“…In this area, the use of redox-active ligands makes it possible to reduce the known general limitation of the main group elements, which, as a rule, do not have a large number of stable oxidation states. 1 Moreover, their presence is one of the main reasons for, in particular, the chemistry of transition metals being so diverse. No less important is the fact that the introduction of a redox active ligand into the coordination sphere is probably the most effective way to influence the position of the frontier orbitals.…”