1. Constructing Crystalline Covalent Organic Frameworks from Chiral Building Blocks.
- Author
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Hai-Sen Xu, San-Yuan Ding, Wan-Kai An, Han Wu, and Wei Wang
- Subjects
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COVALENT crystals , *HETEROGENEOUS catalysis , *ORGANIC compounds , *CHIRALITY , *POROUS materials - Abstract
Covalent organic frameworks (COFs) represent a new type of crystalline porous materials that are covalently assembled from organic building blocks. Construction of functional COFs is, however, a difficult task because it has to meet simultaneously the requirements for crystallinity and functionality. We report herein a facile strategy for the direct construction of chiral-functionalized COFs from chiral building blocks. The key design is to use the rigid scaffold 4,4'-(1H-benzo[d]imidazole-4,7-diyl)dianiline (2) for attaching a variety of chiral moieties. As a first example, the chiral pyrrolidine-embedded building block (S)-4,4'-(2-(pyrrolidin-2-yl)-1H-benzo[d]imidazole-4,7-diyl)dianiline (3) was accordingly synthesized and applied for the successful construction of two chiral COFs, LZU-72 and LZU-76. Our experimental results further showed that these chiral COFs are structurally robust and highly active as heterogeneous organocatalysts. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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