Prospect of Ru(edta) complexes in nitrogen cycle electrocatalysis: a mini review

Abstract

The Nitrogen Cycle is one of the most important biogeochemical cycles on earth. This cycle mainly involves redox conversion of dinitrogen when it is converted into ammonia (nitrogen fixation pathway)...

A Personal Account on Inorganic Reaction Mechanisms

“…Our research contributions exploring the ability of the Ru(edta) complexes to mimic the activity of the oxidoreductase family of enzymes (viz . oxidases, peroxidases, oxygenases, and reductases) evaluating their prospect in catalytic application to chemical and electrochemical transformation of small molecules including NO generation and its utilization are systematically illustrated and reviewed recently [77,78,126,127] . Of particular importance is our very recent studies ascertaining that both the [Ru II (edta)(pz)] 2− and [Ru II (edta)(H 2 O)] 2− complexes electrochemically or chemically (in the presence of electron donors) can effect oxygen reduction reaction (ORR) sequentially converting O 2 to H 2 O 2 efficiently (Scheme 10).…”

“…nitrite (NO 2 − ), hydrazine (NH 2 NH 2 ) and thus lowering their energy barrier for electrochemical transformation has been categorically established. Thus, there is potential for Ru(edta) complexes to act as prospective catalysts in carbon dioxide fixation, [130] and nitrogen cycle reactions [131] . It appears that the edta 4− ligand can exert fine control over both the kinetics and thermodynamics of reactions of catalytic importance.…”

“…oxidases, peroxidases, oxygenases, and reductases) evaluating their prospect in catalytic application to chemical and electrochemical transformation of small molecules including NO generation and its utilization are systematically illustrated and reviewed recently. [77,78,126,127] Of particular importance is our very recent studies ascertaining that both the [Ru II (edta)(pz)] 2À and [Ru II (edta)(H 2 O)] 2À complexes electrochemically or chemically (in the presence of electron donors) can effect oxygen reduction reaction (ORR) sequentially converting O 2 to H 2 O 2 efficiently (Scheme 10). [128] Results of the above studies assume importance in the mechanistic understanding of the reduction of O 2 and H 2 O 2, and thus the assessment of the prospect of such complexes in energy research.…”

“…Thus, there is potential for Ru(edta) complexes to act as prospective catalysts in carbon dioxide fixation, [130] and nitrogen cycle reactions. [131] It appears that the edta 4À ligand can exert fine control over both the kinetics and thermodynamics of reactions of catalytic importance.…”

Relation Between Bond Angle and Carbon–Oxygen Stretching Frequencies in CO2–Containing Compounds

“…CO 2 -containing compounds are abundant across a large array of chemical contexts. Carboxylates and carboxylato complexes, i.e., molecules of the form R–COO – and their salts, are ubiquitous in chemical reactions, commonly playing roles as nucleophiles, intermediates, or coordination ligands for metal ions. − Carboxylate functional groups often participate in the core functionality of a given molecule, e.g., as part of the binding pocket of a protein or by complexing the metal center of a catalyst. − …”