Boosting Visible‐Light Carbon Dioxide Reduction with Imidazolium‐Based Ionic Liquids

Efficiently generating C1 building blocks from environmentally friendly carbon sources, such as through photocatalytic CO2 reduction, is essential for fostering a sustainable circular economy. The pursuit of mild catalytic activation methods has yielded powerful catalysts that can be synergistically...

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Bibliographic Details
Published in:	ChemCatChem Vol. 16; no. 6
Main Authors:	Eisele, Lisa, Chaikhan, Wilaiwan, Batool, Samar, Cherevan, Alexey, Eder, Dominik, Bica‐Schröder, Katharina
Format:	Journal Article
Language:	English
Published:	Weinheim Wiley Subscription Services, Inc 22-03-2024
Subjects:	Additives carbenes Carbon dioxide Chemical synthesis CO2 reduction cooperative effects Hydrogen production Ionic liquids photocatalysis Reduction Rhenium Ruthenium Ruthenium compounds Solvents
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Summary:	Efficiently generating C1 building blocks from environmentally friendly carbon sources, such as through photocatalytic CO2 reduction, is essential for fostering a sustainable circular economy. The pursuit of mild catalytic activation methods has yielded powerful catalysts that can be synergistically employed alongside various reaction media to enhance overall performance. Herein, we elucidate the influence of diverse imidazolium‐based ionic liquids as additives for visible‐light‐driven CO2 reduction with ruthenium(II)‐ and rhenium(I)‐bipyridine complexes. Our investigation reveals that incorporating ionic liquids into traditional solvents at concentrations below 10 % can markedly boost CO production while suppressing H2 generation. The best results were obtained for the highly basic ionic liquid [C2mim][OAc], resulting in a substantial rise in CO formation from 0.3 μmol/h to 5.4 μmol/h and an increase in turnover number from 3 to 59. This study underscores the cooperative influence of imidazolium‐based ionic liquids on CO2 photoreduction while circumventing their use as primary solvents, thus offering a promising avenue for sustainable chemical synthesis. The cooperative effect of imidazolium based ionic liquids on CO2 photoreduction was investigated using [Ru(bpy)3](PF6)2 and [Re(bpy)(CO)3]Cl. Ionic liquids were employed as low‐level additives (<10 % (w/v)), investigating counterion effects. The impact of different counterions could be correlated with counterion basicity, by a up to a 20‐fold increase of CO formation.
ISSN:	1867-3880 1867-3899
DOI:	10.1002/cctc.202301454