Add time:08/26/2019         Source:sciencedirect.com

Three new Ru(II),Rh(III) supramolecular bimetallic complexes of the design [(Ph2phen)2Ru(dpp)RhCl2(R2-bpy)](PF6)3 (R = CH3 (Ru-Rh(Me2bpy)), H (Ru-Rh(bpy)), or COOCH3 (Ru-Rh(dmeb)); Ph2phen = 4,7-diphenyl-1,10-phenanthroline; dpp = 2,3-bis(2-pyridyl)pyrazine; dmeb = 4,4′-dimethyl ester-2,2′-bipyridine; bpy = 2,2′-bipyridine; Me2bpy = 4,4′-dimethyl-2,2′-bipyridine) have been synthesized and analyzed to determine the impact that the polypyridyl terminal ligand (TL) coordinated to the cis-dihalide rhodium(III) metal center has on the photocatalytic activity for water reduction. The bimetallic complexes demonstrate that a correlation exists between the σ-donating ability of the substituted bipyridine ligand, the rate of chloride dissociation upon electrochemical reduction and the activity towards photocatalytic hydrogen production. The weaker σ-donating –COOCH3 substituent in Ru-Rh(dmeb) increases the rate constant for Cl− dissociation (k−Cl = 0.7 s−1) and the amount of H2 produced photocatalytically (37 ± 4 μmol H2, 63 ± 7 turnovers after 20 h; turnovers = mol H2/mol photocatalyst) when compared to –H and –CH3 substituted complexes Ru-Rh(bpy) (k−Cl = 0.2 s−1, 21 ± 2 μmol H2, 35 ± 3 turnovers) and Ru-Rh(Me2bpy) (k−Cl = 0.2 s−1, 18 ± 2 μmol H2, 30 ± 4 turnovers), respectively. Varied catalytic activity with respect to the σ-donor capacity of the Rh-TL is attributed to the relative ease of ligand dissociation and the ability to afford rapid electron collection at the Rh metal center.

We also recommend Trading Suppliers and Manufacturers of RH 414 (cas 116946-58-8). Pls Click Website Link as below: cas 116946-58-8 suppliers