Back to Search
Start Over
Selectively Regulating Lewis Acid–Base Sites in Metal–Organic Frameworks for Achieving Turn‐On/Off of the Catalytic Activity in Different CO2 Reactions.
- Source :
-
Angewandte Chemie . 4/25/2022, Vol. 134 Issue 18, p1-8. 8p. - Publication Year :
- 2022
-
Abstract
- Regulating Lewis acid–base sites in catalysts to investigate their influence in the chemical fixation of CO2 is significant but challenging. A metal–organic framework (MOF) with open metal Co sites, {(NH2Me2)[Co3(μ3‐OH)(BTB)2(H2O)]⋅9 H2O⋅5 DMF}n (1), was obtained and the results of the catalytic investigation show that 1 can catalyze cycloaddition of CO2 and aziridines to give 99 % yield. The efficiency of the cyclization of CO2 with propargyl amines is only 32 %. To improve the catalytic ability of 1, ligand XN with Lewis base sites was introduced into 1 and coordinated with the open Co sites, resulting in a decrease of the Lewis acid sites and an increase in the Lewis base sites in a related MOF 2 ({(NH2Me2)[Co3(μ3‐OH)(NHMe2)(BTB)2(XN)]⋅8 H2O⋅4 DMF}n). Selective regulation of the type of active centers causes the yield of oxazolidinones to be enhanced by about 2.4 times, suggesting that this strategy can turn on/off the catalytic activity for different reactions. The catalytic results from 2 treated with acid solution support this conclusion. This work illuminates a MOF‐construction strategy that produces efficient catalysts for CO2 conversion. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00448249
- Volume :
- 134
- Issue :
- 18
- Database :
- Academic Search Index
- Journal :
- Angewandte Chemie
- Publication Type :
- Academic Journal
- Accession number :
- 156323294
- Full Text :
- https://doi.org/10.1002/ange.202200123