Abstract
A one‐dimensional (1D) metal‐organic caged framework (YMOF‐Y) was obtained via self‐assembly of yttrium cations with a U‐shape imidazolium based ligand and the structure was elucidated by single‐crystal X‐ray diffraction analysis. The YMOF‐Y has a unique 1D chain structure composed of octa‐imidazolium based cages. Inside the cage, an inner Y4 cluster connected to yttrium cations of the cage through formate anions is present. The microporosity and flexibility of YMOF‐Y can be improved by an unprecedented postsynthetic removal of the Y4 clusters from the cage by washing with alkali metal solutions. The removal of the Y4 cluster is reflected in a significant change in the properties of the metal‐organic framework (MOF), as confirmed by carbon dioxide sorption measurements and variable temperature powder X‐ray diffraction analysis.
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