Electrocatalytic Water Oxidation by Mononuclear Copper Complexes of Bis-amide Ligands with N4 Donor: Experimental and Theoretical Investigation.

The present work describes electrocatalytic water oxidation of three monomeric copper complexes [Cu(L1)] (), [Cu(L2)(HO)] (), and [Cu(L3)] () with bis-amide tetradentate ligands: L1 = ,'-(1,2-phenylene)dipicolinamide, L2 = ,'-(4,5-dimethyl-1,2-phenylene)bis(pyrazine-2-carboxamide), L3 = ,'-(1,2-phenylene)bis(pyrazine-2-carboxamide), for the production of molecular oxygen by the oxidation of water at pH 13.0. Ligands and all complexes have been synthesized and characterized by single crystal XRD, analytical, and spectroscopic techniques.

Electrocatalytic water oxidation by heteroleptic ruthenium complexes of 2,6-bis(benzimidazolyl)pyridine Scaffold: a mechanistic investigation.

Three monomeric ruthenium complexes with anionic ligands [Ru(L)(L)(DMSO)][ClO] (1), [Ru(L)(L)(DMSO)] [PF] (2), and [Ru(L)(L)(DMSO)][PF] (3) [L = pyrazine carboxylate, L = 2,6-bis(1-benzo[]imidazol-2-yl)pyridine, L = 4,5-dmbimpy = 2,6-bis(5,6-dimethyl-1-benzo[]imidazol-2-yl)pyridine, L = 4-Fbimpy = 2,6-bis(5-fluoro-1-benzo[]imidazol-2-yl)pyridine, DMSO = dimethyl sulfoxide] as electrocatalysts for water oxidation are reported herein. The single crystal X-ray structure of the complexes reveals the presence of a DMSO molecule, which is supposed to be the labile group undergoing water exchange under the experimental condition of electrocatalysis. Linear sweep voltammetry (LSV) and cyclic voltammetry (CV) study shows the appearance of the catalytic wave for water oxidation at Ru(IV/V) oxidation.