2021/08/30 by Soumyadip Patra, Hemanta Deka, Sanjay K. Singh +1 · 3 citations
Chemical Engineering · Chemistry · Energy · #Carbon dioxide utilization in catalysis #Asymmetric Hydrogenation and Catalysis #CO2 Reduction Techniques and Catalysts
paper · doi:10.1021/acs.inorgchem.1c01784
A series of half sandwich arene–ruthenium complexes [(η6-arene)RuCl(κ2-L)]+ ([Ru]-1–[Ru]-10) containing bis-imidazole methane-based ligands 4,4′-(phenylmethylene)bis(2-ethyl-5-methyl-1H-imidazole) (L1), 4,4′-((4-methoxyphenyl)methylene)bis(2-ethyl-5-methyl-1H-imidazole) (L2), 4,4′-((2-methoxyphenyl)methylene)bis(2-ethyl-5-methyl-1H-imidazole) (L3), 4,4′-((4-chlorophenyl)methylene)bis(2-ethyl-5-methyl-1H-imidazole) (L4), and 4,4′-((2-chlorophenyl)methylene)bis(2-ethyl-5-methyl-1H-imidazole) (L5) are synthesized. The synthesized and purified complexes ([Ru]-1–[Ru]-10) are further employed for hydrogen production from formic acid in aqueous medium. Among the investigated complexes, [(η6-p-cymene)RuCl(κ2-L2)]+ [Ru]-2, having Ru(II) coordinated 4-methoxy phenyl substituted bis-imidazole methane ligand (L2), outperformed over others, displaying a higher catalytic turnover of 8830 and high efficiency (TOF = 1545 h–1) with appreciably high long-term stability for formic acid dehydrogenation in water.