A flexible interpenetrating coordination framework with a bimodal porous functionality

Maji, Tapas Kumar ; Matsuda, Ryotaro ; Kitagawa, Susumu (2007) A flexible interpenetrating coordination framework with a bimodal porous functionality Nature Materials, 6 (2). pp. 142-148. ISSN 1476-1122

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Official URL: https://www.nature.com/articles/nmat1827

Related URL: http://dx.doi.org/10.1038/nmat1827

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)(5H2O)}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 N3− anions and selective gas sorption. The N3-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.

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