Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202300726
Keywords
Chiral Cage-Based Frameworks; Post-Assembly Modification; Recognition and Separation; Titanium-Organic Cages
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A chiral metal-organic cage (MOC) was fixed into a porous framework using a post-assembly modification strategy, allowing for easier study of the host-guest chemistry. An optical resolution was achieved for the anionic Ti4L6 cage, resulting in homochiral Delta Delta Delta Delta- and ????-[Ti4L6] cages. Through a post-assembly reaction, homochiral cage-based microporous frameworks (PTC-236(Delta) and PTC-236(?)) were easily prepared. These frameworks showed high stability and were utilized for the recognition and separation of isomeric molecules, providing a new approach for combining MOCs into functional porous frameworks.
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 Delta Delta Delta Delta- and ????-[Ti4L6] cages were obtained. Accordingly, a pair of homochiral cage-based microporous frameworks (PTC-236(Delta) and PTC-236(?)) 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.
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