High turnover photocatalytic hydrogen formation with an Fe(iii) N-heterocyclic carbene photosensitiser†
Jesper
Schwarz, 
‡a
Aleksandra
Ilic,
‡a
Catherine
Johnson,
‡b
Reiner
Lomoth
*b
and
Kenneth
Wärnmark
*a
‡a
Aleksandra
Ilic,
‡a
Catherine
Johnson,
‡b
Reiner
Lomoth
*b
and
Kenneth
Wärnmark
*a
Abstract
Herein we report the first high turnover photocatalytic hydrogen formation reaction based on an earth-abundant FeIII-NHC photosensitiser. The reaction occurs via reductive quenching of the 2LMCT excited state that can be directly excited with green light and employs either Pt-colloids or [Co(dmgH)2pyCl] as proton reduction catalysts and [HNEt3][BF4] and triethanolamine/triethylamine as proton and electron donors. The outstanding photostability of the FeIII-NHC complex enables turnover numbers >1000 without degradation.
- This article is part of the themed collection: Chemical Communications HOT Articles 2022
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