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• W2091221367 abstract "Abstract Phenylazomethine dendrimers bearing a cobalt porphyrin core act as catalysts for CO 2 reduction in the presence of a strong Lewis acid such as lanthanide trifluoromethanesulfonate (Ln(OTf) 3 ). We investigated the catalytic activity using electrochemical measurements (cyclic voltammetry) on a glassy carbon electrode in a DMF solution. Dissolving CO 2 gas into the solution, the cyclic voltammograms displayed an irreversible increase of the cathodic current. This result suggests the catalytic reduction of CO 2 . The redox potential (–1.3 V versus Fc/Fc + ) at which the catalytic behavior was observed is 1.1 V higher than that catalyzed by cobalt tetraphenylporphyrin (CoTPP). The generation number ( n ) dependence of the dendrimer catalysts showed the maximum activity at n = 3. A significant decrease of the activity for the largest dendrimer ( n = 4) indicates a steric effect, which prevents transmission of the substrate (CO 2 molecule) and electrons to the catalytic center (cobalt porphyrin core). For more efficient catalysis, a novel open‐shell dendrimer having a pocket on one side of the molecule was designed and synthesized. Because the accessibility to the core in the opened shell improved, this dendrimer exhibited the highest catalytic activity. These results suggest that tuning of the local domain around the cobalt porphyrin center would lead to a decisive solution for further activation of the CO 2 molecule. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 5229–5236, 2006" @default.
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• W2091221367 date "2006-07-28" @default.
• W2091221367 modified "2023-09-23" @default.
• W2091221367 title "Synergetic activation of carbon dioxide molecule using phenylazomethine dendrimers as a catalyst" @default.
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• W2091221367 doi "https://doi.org/10.1002/pola.21611" @default.
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