NO and NO2 as non-innocent ligands: A comparison

The potential of environmentally and technically relevant NO2 for non-innocent ligand behavior in coordination compounds is being evaluated in comparison with the well-studied metal complexes of nitrosyl, NOn (n = +,0,-,2-). A ruthenium semiquinone (Q(center dot-)) radical complex platform [Ru(Q)(L)(NOx)] (x = 1 or 2, L = mer tridentate ligand) can serve to contrast the ligand characteristics of (NO)(n) and (NO2)(n). Strategies to stabilize metal coordinated nitrogen dioxide (as nitro ligand NO2) versus the well established nitrite NO2- are suggested. (C) 2019 Elsevier B.V. All rights reserved.