Calix[8]arene‐Based Manganese Complexes for Electrocatalytic CO 2 Reduction
Abstract Transition metal catalysts with modified second‐coordination sphere employed in the electrocatalytic CO 2 can result in increased activity or directed product selectivity. Calixarenes can form metal complexes and potentially catalyze reactions within its cavity, taking advantage of the surr...
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| Published in: | Israel journal of chemistry 2023-09 |
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| Main Authors: | , |
| Format: | Article |
| Language: | eng |
| Online Access: | Request full text |
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| Summary: | Abstract Transition metal catalysts with modified second‐coordination sphere employed in the electrocatalytic CO 2 can result in increased activity or directed product selectivity. Calixarenes can form metal complexes and potentially catalyze reactions within its cavity, taking advantage of the surrounding phenols groups to tune the reactivity by second‐coordination sphere effects. Here, we present a Mn(I) bromotricarbonyl complex with phenanthroline‐functionalized calix[8]arene ligands capable of electrocatalytically reducing CO 2 into different products with 2,2,2‐trifluoroethanol as proton donor. The selectivity of the reaction seems to be affected by the calixarene cavity: two calixarene‐free analogous complexes reduce CO 2 to CO almost exclusively, while the calixarene complexes produce primarily CO, H 2 . Interestingly, in some cases the less frequently observed CH 4 was also detected, albeit with low Faradaic efficiency. Thus, the manganese center placed within the calixarene cavity promotes the formation of reduced CO 2 products by more than two electrons and two protons, affording CH 4 in some cases. |
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| ISSN: | 0021-2148 1869-5868 |