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Efficient photocatalytic water reduction by a cobalt(II) tripodal iminopyridine complex

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Abstract

The visible light-driven catalytic water reduction by a cobalt(II) tripodal iminopyridine complex [Co(tachpy3)](ClO4)2 (1) (tachpy3 = cis,cis-1,3,5-tris(pyridine-2-carboxaldimino)-cyclohexane) has been investigated in aqueous acetonitrile. The catalysis is found to be homogeneous and an impressive H2 TON of 16 440 has been achieved, which is far better than that by a structurally related complex [Co(trenpy3)](ClO4)2 (2) (trenpy3 = tris-[4-(2-pyridyl)-3-azabut-3-enyl]amine) bearing identical donor groups. A comparison between the two complexes reveals that the catalytic properties are sensitive to the change in ligand rigidity and thus the coordination geometry, as reflected by their respective reaction potentials and H2 TONs. The catalysis of 1 proceeds via a penta-coordinate species formed by the protonation of the corresponding CoI state. The results in spectroscopic and electrochemical studies are supplemented by DFT computation.

Graphical abstract: Efficient photocatalytic water reduction by a cobalt(ii) tripodal iminopyridine complex

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Publication details

The article was received on 28 Jul 2017, accepted on 18 Nov 2017 and first published on 20 Nov 2017


Article type: Paper
DOI: 10.1039/C7CY01524K
Citation: Catal. Sci. Technol., 2018, Advance Article
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    Efficient photocatalytic water reduction by a cobalt(II) tripodal iminopyridine complex

    C.-F. Leung, S.-C. Cheng, Y. Yang, J. Xiang, S.-M. Yiu, C.-C. Ko and T.-C. Lau, Catal. Sci. Technol., 2018, Advance Article , DOI: 10.1039/C7CY01524K

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