Ni(II)-Dithiocarbamate and -diphosphine coordination complexes as pre-catalysts for electrochemical OER activity.

Electrochemical water oxidation holds immense potential for sustainable energy generation, splitting water into clean-burning hydrogen and life-giving oxygen. However, a key roadblock lies in the sluggish nature of the oxygen evolution reaction (OER). Finding stable, cost-effective, and environmentally friendly catalysts with high OER efficiency is crucial to unlock this technology's full potential.

Axial ligand-induced high electrocatalytic hydrogen evolution activity of molecular cobaloximes in homo- and heterogeneous medium.

Three new molecular cobaloxime complexes with the general formula [ClCo(dpgH)L] (1-3), where L1 = -(4-pyridylmethyl)-1,8-naphthalimide, L2 = 4-bromo--(4-pyridylmethyl)-1,8-naphthalimide, L3 = 4-piperidin--(4-pyridylmethyl)-1,8-naphthalimide, have been synthesized and characterized by UV-Vis, multinuclear NMR, FT-IR and PXRD spectroscopic techniques. The crystal structures of all complexes have also been reported. The electrocatalytic activity of complexes is investigated under two catalysis conditions: (i) homogeneous conditions in acetonitrile using acetic acid (AcOH) as a proton source and (ii) heterogeneous conditions upon immobilization onto the surface of activated carbon cloth (CC).

Chlorocobaloxime containing -(4-pyridylmethyl)-1,8-naphthalamide peripheral ligands: synthesis, characterization and enhanced electrochemical hydrogen evolution in alkaline medium.

Two new discrete cobaloxime based complexes with the general formula [ClCo(dioxime)L] (1 and 2), L1 = -(4-pyridylmethyl)-1,8-naphthalamide, L2 = 4-bromo--(4-pyridylmethyl)-1,8-naphthalamide have been synthesized and characterized by various spectroscopic techniques such as FT-IR, H, C{H} NMR and PXRD. The molecular structures of both complexes have also been determined using single crystal X-ray crystallography. The solid state molecular structures revealed distorted octahedral geometry around the Co(III) central metal ion with two dioximes in the equatorial plane and axial positions are occupied by chloro and pyridine nitrogen of -(4-pyridylmethyl)-1,8-naphthalamide ligands.

Homoleptic Ni(II) dithiocarbamate complexes as pre-catalysts for the electrocatalytic oxygen evolution reaction.

Four new functionalized Ni(II) dithiocarbamate complexes of the formula (1-4) (L = -methylthiophene--3-pyridylmethyl dithiocarbamate, L = -methylthiophene--4-pyridylmethyl dithiocarbamate, L = -benzyl--3-pyridylmethyl dithiocarbamate, and L = -benzyl--4-pyridylmethyl dithiocarbamate) have been synthesized and characterized by IR, UV-vis, and H and C{H} NMR spectroscopic techniques. The solid-state structure of complex 1 has also been determined by single crystal X-ray crystallography. Single crystal X-ray analysis revealed a monomeric centrosymmetric structure for complex 1 in which two dithiocarbamate ligands are bonded to the Ni(II) metal ion in a S^S chelating mode resulting in a square planar geometry around the nickel center.