Oxidation Chemistry of Metal(II) Salen-Type Complexes

Classical Characterization Techniques to Reveal the Structural Model of Nanocomposites with Bimetallic Monolayers of Porphyrins

“…A large number of metal organic compounds, especially high valence metal complexes formed as the result of redox reactions, has been synthesized and characterized in the few last years. − Most of these studies were carried out with the aim of getting a deeper insight into the active site of metalloenzymes to understand the reaction mechanisms of many metabolic processes. − An interesting aspect to evaluate is the difference between the formal oxidation number and the experimental oxidation state of the metal in many biological systems. Various radicals are formed at a proximal position of the metal center due to the presence of ligands that do not necessarily possess a closed-shell configuration (noninnocent ligands). , Metalloporphyrins belong to this class of ligands, playing a critical role in biological systems where they participate as the redox center of many enzymes. The reduction of molecular oxygen occurs through a different mechanism ruled by the metal and/or axial ligands involved .…”

Properties of the indole ring in metal complexes. A comparison with the phenol ring

“…Recently some radical complexes of salen-type (salen = N,N′-bis(salicylidene)ethylenediamine) tetradentate Schiff base ligands having two phenol moieties were isolated and characterized in detail [84,85]. The X-ray structures of oneelectron oxidized Cu(II)-salen type complexes are shown in Figs.…”

Stereoselective Reactions with Chiral Schiff Base Metal Complexes

“…Salen metal complexes are redox active complexes, capable of undergoing redox chemistry at the metal. [35] In 2006 Fürstner reported the concept of catalytic redox systems, applying a sacrificial reductant (Mn) and a scavenger (Me 3 SiCl) to a Nozaki-Hiyama-Kishi reaction. Previously conducted with an over-stoichiometric amount of highly sensitive Cr(ii)Cl 2 , this variant allowed for the utilization of the chromium source in catalytic qualities.…”