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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Acknowledgements
This work was supported by Grants-in-Aid for Scientific Research in a Priority Area ‘Chemistry of coordination space’ (434) and a CREST/JST programme from the Ministry of Education, Culture, Sports, Science and Technology, Government of Japan.
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Maji, T., Matsuda, R. & Kitagawa, S. A flexible interpenetrating coordination framework with a bimodal porous functionality. Nature Mater 6, 142–148 (2007). https://doi.org/10.1038/nmat1827
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DOI: https://doi.org/10.1038/nmat1827
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