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 language | English |
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Article number | e202200361 |
Journal | European Journal of Inorganic Chemistry |
Volume | 31 |
Issue number | 8 |
Early online date | 10 Aug 2022 |
DOIs | |
Publication status | Published - 08 Nov 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, 31(8). Retrieved from https://doi.org/10.1002/ejic.202200361Keywords
- Cobalt
- Iminopyridine ligands, organic photosensitizer
- Photocatalysis
- Water reduction