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Photo‐Induced Water Oxidation Based on a Mononuclear Cobalt(II) Complex
Author(s) -
Wang Hongyan,
Lu Yongbin,
Mijangos Edgar,
Thapper Anders
Publication year - 2014
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201300856
Subject(s) - chemistry , cobalt , catalysis , turnover number , cationic polymerization , amine gas treating , electrochemistry , ligand (biochemistry) , chloride , metal , photochemistry , transition metal , inorganic chemistry , acceptor , metal ions in aqueous solution , polymer chemistry , organic chemistry , electrode , biochemistry , physics , receptor , condensed matter physics
Abstract Photo‐induced water oxidation based on first row transition metal complexes has drawn much attention recently as a part of the efforts to design systems for solar fuel production. Here, the classic tetradentate ligand TPA (tris(2‐pyridylmethyl)amine) is used together with cobalt(II) in CH 3 CN to form a mononuclear cobalt complex [Co(TPA)Cl]Cl. Single crystal X‐ray diffraction shows that [Co(TPA)Cl]Cl is composed of discrete cationic units with a penta‐coordinate cobalt center, along with chloride counter ions. In borate buffer, the Co complex acts as a water oxidation catalyst, as shown by the presence of a catalytic wave in electrochemistry. Under visible light irradiation, in the presence of photosensitizer and electron acceptor, the Co complex catalyzes O 2 evolution with a turnover frequency (TOF) of 1.0 mol(O 2 )·mol(Co) −1 ·s −1 and a turnover number (TON) of 55 mol(O 2 )·mol(Co) −1 in pH 8 borate buffer.