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RSC Advances
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ARTICLE
Journal Name
similar absorbing band characteristic to the fresh MIL-101-Cr-NH-
RSO3H (Fig. S7†), suggesting high stability of supported -SO3H
heterogeneous catalyst.
251.
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In summary, a heterogeneous Brønsted acid catalyst, MIL-101-
Cr-NH-RSO3H, was developed through
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a post-synthetic
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,
modification of MIL-101-Cr-NH2 using 1,3-propanesultone.
The high surface area and large pore size of the parent MIL-
101-Cr-NH2 MOF not only ensured enough contact between the
substrate and the active center of -SO3H in the framework but
also promoted the evacuation of product molecules from the
network. The as-synthesized MIL-101-Cr-NH-RSO3H catalyst
provided the high catalytic activity for the condensation of 1,2-
diamines with benzil. The MIL-101-Cr-NH-RSO3H catalyst
also showed good reusability and general applicability towards
various kinds of 1,2-diamines and 1,2 dicarbonyl compounds.
The incorporation strategy of -SO3H active species in the
framework of MOF support provides a simple, low-cost and
highly efficient approach for the synthesis of heterogeneous
catalysts.
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Acknowledgements
This work was supported by National Natural Science
Foundation of China (863 Program, no. 2013AA031702) and
the Co-building Special Project of Beijing Municipal
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