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• W4306804946 abstract "Electrochemical analysis of three new cobalt pentapyridine complexes reveals synthetic alteration through esterification leads to a 250 mV reduction in the catalytic overpotential required for proton reduction. The ability to synthetically tune catalytic performance is a key advantage in the use of molecular catalysts. A series of cobalt pentapyridine carboxylate esters [Co(Py5Me 2 COOMe)(CH 3 CN)] 2+ (Co-Me), [Co(Py5Me 2 COOn-Pr)(CH 3 CN)] 2+ (Co-Pr) and [Co(Py5Me 2 COOPh)(CH 3 CN)] 2+ (Co-Ph) were successfully synthesised and characterised through HD-MS, FT-IR and cyclic voltammetry. Electrochemical studies reveal the complexes are active for electrocatalytic proton reduction in acetonitrile with acetic acid as the proton source. At an acid concentration of 2 mM, the required overpotential for proton reduction was calculated to be 465 mV for Co-Me, 485 mV for Co-Pr and 360 mV for Co-Ph. The rate constant is calculated to be 9.41 s -1 ,4.09 s -1 and 7.25 s -1 for complexes Co-Me, Co-Pr and Co-Ph respectively. The cobalt carboxylate complex [Co(Py5Me 2 COO - )(OH - )] 1 + ( Co-COOH) was used to prepare chemically modified electrodes from fluorine doped tin oxide (FTO) coated glass and glassy carbon with a calculated surface coverage of 6.38 x10 -11 mol/cm 2 and of 6.18 x10 -11 mol/cm 2 respectively. The successful reduction of catalytic overpotential through esterification offers an alternative pathway for the design of molecular catalysts." @default.
• W4306804946 created "2022-10-20" @default.
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• W4306804946 date "2022-12-01" @default.
• W4306804946 modified "2023-09-23" @default.
• W4306804946 title "Carboxylate pentapyridines: Pathway to surface modification and tuneable catalytic proton reduction" @default.
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• W4306804946 doi "https://doi.org/10.1016/j.poly.2022.116177" @default.
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