A flexible interpenetrating coordination framework with a bimodal porous functionality

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Abstract

Introducing a functional part into open-framework materials that tunes the pore size/shape and overall porous activity will open new routes in framework engineering and in the fabrication of new materials. We have designed and synthesized a bimodal microporous twofold interpenetrating network [Ni(bpe)"2(N(CN)"2)](N(CN)"2)(5H"2O)(n) (1), with two types of channel for anionic N(CN)"2- (dicyanamide) and neutral water molecules, respectively. The dehydrated framework provides a dual function of specific anion exchange of free N(CN)"2- for the smaller N"3- anions and selective gas sorption. The N"3-exchanged framework leads to a dislocation of the mutual positions of the two interpenetrating frameworks, resulting in an increase in the effective pore size in one of the counterparts of the channels and a higher accommodation of adsorbate than in the as-synthesized framework (1), showing the first case of controlled sorption properties in flexible porous frameworks. © 2007 Nature Publishing Group.

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Maji, T. K., Matsuda, R., & Kitagawa, S. (2007). A flexible interpenetrating coordination framework with a bimodal porous functionality. Nature Materials, 6(2), 142–148. https://doi.org/10.1038/nmat1827

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