Photochemical Hydrogen Evolution from Neutral Water with a Cobalt Metallopeptide Catalyst | Zendy

Saikat Chakraborty | Zendy; Emily H. Edwards | Zendy; Banu Kandemir | Zendy; Kara L. Bren | Zendy

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Photochemical Hydrogen Evolution from Neutral Water with a Cobalt Metallopeptide Catalyst

Author(s) -

Saikat Chakraborty,

Emily H. Edwards,

Banu Kandemir,

Kara L. Bren

Publication year - 2019

Publication title -

inorganic chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.348

H-Index - 233

eISSN - 1520-510X

pISSN - 0020-1669

DOI - 10.1021/acs.inorgchem.9b02067

Subject(s) - chemistry , photochemistry , catalysis , cobalt , turnover number , aqueous solution , quenching (fluorescence) , photosensitizer , tripeptide , hydrogen , ion , hydrogen production , inorganic chemistry , fluorescence , organic chemistry , biochemistry , physics , quantum mechanics , amino acid

CoGGH, a Gly-Gly-His tripeptide coordinated to a cobalt ion, is shown to catalyze the reduction of aqueous protons to hydrogen (H 2 ) in a light-driven reaction in water near neutral pH. Using [Ru(bpy) 3 ] 2+ as a photosensitizer and ascorbate as an electron donor, a turnover number up to 2200 with respect to CoGGH has been observed with the system remaining active for more than 48 h. The reaction conditions that favor H 2 production are consistent with a reductive quenching mechanism. Results also suggest that CoGGH is robust under these reaction conditions and loss of activity over time results from [Ru(bpy) 3 ] 2+ degradation.

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