期刊
FRONTIERS IN CHEMISTRY
卷 10, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fchem.2022.845274
关键词
Pd clusters; subnanometer size; Schiff base; Suzuki coupling reaction; metal organic frameworks
资金
- National Natural Science Foundation of China [21802119]
- National Key Research and Development Program [2016YFC0209203]
- Joint Open Fund of Jiangsu Collaborative Innovation Center for Ecological Building Material and Environmental Protection Equipment and Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province [JH201806]
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province [JH201806, xjr2019005]
In this study, new Schiff base-imidazole-functionalized MOFs were synthesized, and highly dispersed Pd clusters showed excellent catalytic activity in the Suzuki coupling reaction with a yield of over 99%.
Subnanometer noble metal clusters have attracted much attention because of abundant low-coordinated metal atoms that perform excellent catalytic activity in various catalytic processes. However, the surface free energy of metals increases significantly with decreasing size of the metal clusters, which accelerates the aggregation of small clusters. In this work, new Schiff base-imidazole-functionalized MOFs were successfully synthesized via the postsynthetic modification method. Highly dispersed Pd clusters with an average size of 1.5 nm were constructed on this functional MOFs and behaved excellent catalytic activity in the Suzuki coupling of phenyboronic acid and bromobenzene (yield of biaryl >99%) under mild reaction conditions. Moreover, the catalyst can be reused six times without loss of activity. Such catalytic behavior is found to closely related to the surface functional groups that promote the formation of small Pd-0 clusters in the metallic state.
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