Ligand substituent effects on the light-driven hydrogen evolution by Cobalt(II) tripodal iminopyridine catalysts under precious-metal free conditions

Chun-Leung KWOK, Shun-Cheung CHENG, Pui-Yu HO, Shek-Man YIU, Ka Man Vonika AU, Wing Kei HO, Po Keung Eric TSANG, Jing XIANG, Chi Fai LEUNG, Chi-Chiu KO

Research output: Contribution to journalArticlespeer-review

Abstract

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 ( λ> 420 nm) in aqueous acetonitrile (2.5%, v/v), using tris( 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. Copyright © 2022 Wiley-VCH GmbH.
Original languageEnglish
JournalEuropean Journal of Inorganic Chemistry
Early online date10 Aug 2022
DOIs
Publication statusE-pub ahead of print - 10 Aug 2022

Citation

Kwok, C.-L., Cheng, S.-C., Ho, P.-Y., Yiu, S.-M., Au, V. K.-M., Ho, W.-K., . . . Ko, C.-C. (2022). Ligand substituent effects on the light-driven hydrogen evolution by Cobalt(II) tripodal iminopyridine catalysts under precious-metal free conditions. European Journal of Inorganic Chemistry. Advance online publication. doi: 10.1002/ejic.202200361

Keywords

  • Cobalt
  • Iminopyridine ligands, organic photosensitizer
  • Photocatalysis
  • Water reduction

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