Enhanced catalytic activity of solubilised species obtained by counter-cation exchange of K{CoII1.5[FeII(CN)6]} for water oxidation†
Abstract
A cyano-bridged coordination polymer, K{CoII1.5[FeII(CN)6]} {(K)Co–Fe}, reported as a highly active heterogeneous catalyst for water oxidation was solubilised by a conventional counter-cation exchange of K+ with Me4N+ ions to provide the homogeneous catalyst of (Me4N){CoII1.5[FeII(CN)6]} {(Me4N)Co–Fe}. (Me4N)Co–Fe exhibited enhanced catalytic activity for photocatalytic water oxidation using [Ru(2,2′-bipyridine)3]2+ and S2O82− as a photosensitiser and a sacrificial electron acceptor, respectively, in terms of the initial reaction rate (1.26 μmol min−1), which is about twice that of (K)Co–Fe (0.61 μmol min−1). Powder X-ray diffraction, pair distribution function and electrospray ionization mass spectrometry measurements of (Me4N)Co–Fe manifested that small heptanuclear clusters of {Co4[Fe(CN)6]3}4− formed by depolymerisation are catalytically active species in solution.
![Graphical abstract: Enhanced catalytic activity of solubilised species obtained by counter-cation exchange of K{CoII1.5[FeII(CN)6]} for water oxidation](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=D4SC04390A&imageInfo.ImageIdentifier.Year=2024)
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