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Mechanistic investigations of cobalt-catalyzed hydrogen evolution

Marinescu, Smaranda C. and Dempsey, Jillian L. and Gray, Harry B. and Winkler, Jay R. (2013) Mechanistic investigations of cobalt-catalyzed hydrogen evolution. In: 245th ACS National Meeting & Exposition, Abstracts of Papers, April 7-11, 2013, New Orleans, LA.

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Natural photosynthesis uses sunlight to drive the conversion of energy-poor mols. (H_2O, CO_2) to energy-rich ones (O_2, CH_2O_n). Many scientists are actively engaged in developing efficient artificial photosynthetic systems that split water into H_2 and O_2. Solar fuels prodn. involves three basic components: light absorption; charge transport; and multielectron redox catalysis. High on the list of challenges is the discovery of mols. that efficiently catalyze the redn. of protons to H_2. We have investigated the mechanisms of two types of cobalt hydrogen evolution catalysts: Co^(II)-diglyoxime and Co^I-(1,1,1-tris(diphenylphosphinomethyl) ethane) complexes. Time resolved spectroscopic measurements have provided crit. insights into the kinetics of H_2 prodn. In both cases, protonation of Co^I produces a Co^(III)-H complex. Redn. of Co^(III)-H by Co^I produces a Co^(II)-H transient that reacts rapidly with proton donors to produce H_2.

Item Type:Conference or Workshop Item (Paper)
Related URLs:
URLURL TypeDescription website
Marinescu, Smaranda C.0000-0003-2106-8971
Gray, Harry B.0000-0002-7937-7876
Winkler, Jay R.0000-0002-4453-9716
Additional Information:© 2013 American Chemical Society.
Record Number:CaltechAUTHORS:20130729-103349212
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39624
Deposited By: Tony Diaz
Deposited On:29 Jul 2013 21:22
Last Modified:09 Mar 2020 13:19

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