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A flexible interpenetrating coordination framework with a bimodal porous functionality

Nature Materials volume 6, pages 142148 (2007) | Download Citation

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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Author notes

    • Tapas Kumar Maji

    Present address: Chemistry and Physics of Materials Unit, Jawaharlal Nehru Center for Advanced Scientific Research, Jakkur, Bangalore-560 064, India

    • Ryotaro Matsuda

    Present address: Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka, 816-8586, Japan

Affiliations

  1. Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan

    • Tapas Kumar Maji
    • , Ryotaro Matsuda
    •  & Susumu Kitagawa

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Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to Susumu Kitagawa.

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    Supplementary Information; Figures S1-S8; Tables S1, S2

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DOI

https://doi.org/10.1038/nmat1827

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