Article abstract
Nature Materials 6, 142 - 148 (2007)
Published online: 28 January 2007 | doi:10.1038/nmat1827
Subject Categories: Catalytic materials | Porous materials | Design synthesis and processing
A flexible interpenetrating coordination framework with a bimodal porous functionality
Tapas Kumar Maji1,2, Ryotaro Matsuda1,3 & Susumu Kitagawa1
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.
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
- Present address: Chemistry and Physics of Materials Unit, Jawaharlal Nehru Center for Advanced Scientific Research, Jakkur, Bangalore-560 064, India
- Present address: Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka, 816-8586, Japan
Correspondence to: Susumu Kitagawa1 e-mail: kitagawa@sbchem.kyoto-u.ac.jp
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