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摘要
Cobalt tripodal iminopyridine complexes [Co(L)](2+) (1-4), where L=cis,cis,-1,3,5-tris(pyridine-2-carboxaldimino)-cyclohexane (1) and its derivatives, bearing substituents of varying electronic properties at the pyridine moieties, act as water reduction catalysts (WRCs) under visible light (lambda>420 nm) in aqueous acetonitrile (2.5 %, v/v), using tri(n-butyl)triazatriagulenium (TATA(+)) as the organic photosensitizer and triethylamine (TEA) as the sacrificial donor. In the presence of added acetic acid, enhanced turnover numbers (TONs) of 1430-2810 were recorded with the substituted catalysts (2-4), which are attributed to the varied catalytic potential (E-cat) upon the introduction of the substituents.
