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• W2891145257 abstract "Two heteroleptic nickel(II) complexes of the type [Ni(bis-NHC)(dRpe)]2+ (1, R = phenyl; 2, R = methyl; bis-NHC = 1,l′:3,3′-bis(1,3-propanediyl)dibenzimidazolin-2,2′-diylidene) have been synthesized and characterized. The complexes exhibit reversible, two-electron reductions at −1.53 and −1.87 V versus Fc+/0, respectively. Through the use of thermodynamic scaling relationships, hydricities for the corresponding nickel(II) hydride complexes 1H and 2H are estimated to be 45.6 and 37.8 kcal mol–1, respectively. Experimental estimation of an upper bound for the hydricities (ΔGH–°(1H) < 50.3 kcal mol–1 and ΔGH–°(2H) < 40.6 kcal mol–1) was determined by selection of an added weak acid such that the hydrogen evolution reaction (HER) becomes exergonic vs endergonic. Further electrochemical studies establish 2 as an efficient hydrogen evolution electrocatalyst, operating at low overpotential (η = 0.4 V) and reasonable rates (TOF ∼ 1000 s–1) using phenol as the Bronsted acid source. This demonstrates the utility of ..." @default.
• W2891145257 created "2018-09-27" @default.
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• W2891145257 date "2018-09-05" @default.
• W2891145257 modified "2023-09-24" @default.
• W2891145257 title "Utilization of Thermodynamic Scaling Relationships in Hydricity To Develop Nickel Hydrogen Evolution Reaction Electrocatalysts with Weak Acids and Low Overpotentials" @default.
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• W2891145257 doi "https://doi.org/10.1021/acscatal.8b02922" @default.
• W2891145257 hasPublicationYear "2018" @default.
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