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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

8 Scopus Citations
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Author(s)

  • C.-F. Leung
  • S.-C. Cheng
  • Y. Yang
  • J. Xiang
  • S.-M. Yiu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)307-313
Journal / PublicationCatalysis Science and Technology
Volume8
Issue number1
Online published20 Nov 2017
Publication statusPublished - 7 Jan 2018

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 16440 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.

Citation Format(s)

Efficient photocatalytic water reduction by a cobalt(II) tripodal iminopyridine complex. / Leung, C.-F.; Cheng, S.-C.; Yang, Y.; Xiang, J.; Yiu, S.-M.; Ko, C.-C.; Lau, T.-C.

In: Catalysis Science and Technology, Vol. 8, No. 1, 07.01.2018, p. 307-313.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review