Open AccessPhotochemical 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 , hydrogen production , ion , inorganic chemistry , fluorescence , organic chemistry , peptide , biochemistry , physics , quantum mechanics
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.