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Title: Hydricity of Transition-Metal Hydrides: Thermodynamic Considerations for CO2 Reduction

Journal Article · · ACS Catalysis

The hydricity ΔG°H- of a metal hydride is an important parameter for describing the reactivity of such complexes. Here, we compile a comprehensive data set consisting of 51 transition-metal hydride complexes [M-H](n-1)+ with known ΔG°H- values in acetonitrile for which the one-electron reduction of the parent complex [M]n+ is reversible. Plotting the hydricity as a function of respective E1/2(Mn+/(n-1)+) yields a robust linear correlation. While this correlation has been previously noted for limited data sets, our analysis demonstrates that this trend extends over a wide range of metal identities, ligand architectures, structural geometries, and overall charges of the metal hydride. This correlation is modeled using established thermochemical cycles relating the hydricity and homolytic bond free energy of the metal-hydride bond. The linear trend of the model enables the estimation of hydricity simply on the basis of the reduction potential of the parent complex and thus provides a guide for the rational design and tuning of metal hydride catalysts for small-molecule reduction, such as CO2 to formic acid.

Research Organization:
Univ. of California, San Diego, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0004993
OSTI ID:
1417924
Alternate ID(s):
OSTI ID: 1508329
Journal Information:
ACS Catalysis, Vol. 8, Issue 2; ISSN 2155-5435
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 158 works
Citation information provided by
Web of Science

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Figures / Tables (19)