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Post-Assembly Modification of Homochiral Titanium–Organic Cages for Recognition and Separation of Molecular Isomers |
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| Authors: | Dr Guang-Hui Chen Yan-Ping He Yinghua Yu Hong Lv Dr Shangda Li Prof Fei Wang Prof Zhi-Gang Gu Prof Jian Zhang |
| Institution: | 1. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 P. R. China
These authors contributed equally to this work.;2. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 P. R. China University of Chinese Academy of Sciences, Beijing, 100049 P. R. China These authors contributed equally to this work.;3. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 P. R. China |
| Abstract: | A chiral metal–organic cage (MOC) was extended and fixed into a porous framework using a post-assembly modification strategy, which made it easier to study the host–guest chemistry of the solid-state MOC using a single-crystal diffraction technique. Anionic Ti4L6 (L=embonate) cage can be used as a 4-connecting crystal engineering tecton, and its optical resolution was achieved, thus homochiral ΔΔΔΔ- and ΛΛΛΛ-Ti4L6] cages were obtained. Accordingly, a pair of homochiral cage-based microporous frameworks ( PTC-236(Δ) and PTC-236(Λ) ) were easily prepared by a post-assembly reaction. PTC-236 has rich recognition sites provided by the Ti4L6 moieties, chiral channels and high framework stability, affording a single-crystal-to-single-crystal transformation for guest structure analyses. Thus it was successfully utilized for the recognition and separation of isomeric molecules. This study provides a new approach for the orderly combination of well-defined MOCs into functional porous frameworks. |
| Keywords: | Chiral Cage-Based Frameworks Post-Assembly Modification Recognition and Separation Titanium–Organic Cages |