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Efficient Water Oxidation Catalyzed by Mononuclear Ruthenium(II) Complexes Incorporating Schiff Base Ligands
Author(s) -
Li TingTing,
Chen Yong,
Li FuMin,
Zhao WeiLiang,
Wang ChuanJun,
Lv XiaoJun,
Xu QuanQing,
Fu WenFu
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201305011
Subject(s) - chemistry , ruthenium , isoquinoline , schiff base , catalysis , nucleophile , turnover number , catalytic cycle , picoline , ligand (biochemistry) , acceptor , inorganic chemistry , medicinal chemistry , polymer chemistry , organic chemistry , pyridine , biochemistry , physics , receptor , condensed matter physics
Four new charge‐neutral ruthenium(II) complexes containing dianionic Schiff base and isoquinoline or 4‐picoline ligands were synthesized and characterized by NMR and ESI‐MS spectroscopies, elemental analysis, and X‐ray diffraction. The complexes exhibited excellent chemical water oxidation activity and high stability under acidic conditions (pH 1.0) using (NH 4 ) 2 Ce(NO 3 ) 6 as a sacrificial electron acceptor. The high catalytic activities of these complexes for water oxidation were sustained for more than 10 h at low concentrations. High turnover numbers of up to 3200 were achieved. A water nucleophilic attack mechanism was proposed. A Ru V O intermediate was detected during the catalytic cycle by high‐resolution mass spectrometry.