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Water-Mediated Proton Conduction in a Robust Triazolyl Phosphonate Metal-Organic Framework with Hydrophilic Nanochannels

Begum, Salma ; Wang, Zhaoyang ; Donnadio, Anna ; Costantino, Ferdinando ; Casciola, Mario ; Valiullin, Rustem ; Chmelik, Christian ; Bertmer, Marko ; Kärger, Jörg ; Haase, Jürgen ; Krautscheid, Harald

Chemistry : a European journal, 2014-07, Vol.20 (29), p.8862-8866 [Periódico revisado por pares]

Weinheim: WILEY-VCH Verlag

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  • Título:
    Water-Mediated Proton Conduction in a Robust Triazolyl Phosphonate Metal-Organic Framework with Hydrophilic Nanochannels
  • Autor: Begum, Salma ; Wang, Zhaoyang ; Donnadio, Anna ; Costantino, Ferdinando ; Casciola, Mario ; Valiullin, Rustem ; Chmelik, Christian ; Bertmer, Marko ; Kärger, Jörg ; Haase, Jürgen ; Krautscheid, Harald
  • Assuntos: Dehydration ; Diffusion ; diffusion studies ; Impedance spectroscopy ; Metal-organic frameworks ; Metalorganic compounds ; microporous materials ; Nanostructure ; Phosphonates ; Proton conduction ; Three dimensional
  • É parte de: Chemistry : a European journal, 2014-07, Vol.20 (29), p.8862-8866
  • Notas: Higher Education Commission Pakistan
    the graduate school BuildMoNa
    istex:26375397FC859B2D8E53322F95B7E21D97191A87
    ark:/67375/WNG-JHVD0149-X
    ArticleID:CHEM201402886
    Universität Leipzig
    Deutsche Forschungsgemeinschaft - No. KR 1675/7-2
    DAAD
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: The development of water‐mediated proton‐conducting materials operating above 100 °C remains challenging because the extended structures of existing materials usually deteriorate at high temperatures. A new triazolyl phosphonate metal–organic framework (MOF) [La3L4(H2O)6]Cl⋅x H2O (1, L2−=4‐(4H‐1,2,4‐triazol‐4‐yl)phenyl phosphonate) with highly hydrophilic 1D channels was synthesized hydrothermally. Compound 1 is an example of a phosphonate MOF with large regular pores with 1.9 nm in diameter. It forms a water‐stable, porous structure that can be reversibly hydrated and dehydrated. The proton‐conducting properties of 1 were investigated by impedance spectroscopy. Magic‐angle spinning (MAS) and pulse field gradient (PFG) NMR spectroscopies confirm the dynamic nature of the incorporated water molecules. The diffusivities, determined by PFG NMR and IR microscopy, were found to be close to that of liquid water. This porous framework accomplishes the challenges of water stability and proton conduction even at 110 °C. The conductivity in 1 is proposed to occur by the vehicle mechanism. Proton‐conducting MOFs: Water‐filled nanochannels are the basis for ionic conductivity in [La3L4(H2O)6]Cl⋅x H2O (see figure; L=triazolyl phenyl phosphonate). Reversible hydration/dehydration and proton conduction even above the boiling point of water are characteristic for the hydrothermally synthesized 3D coordination polymer. Crystal structure, diffusion, and impedance spectroscopy data are reported.
  • Editor: Weinheim: WILEY-VCH Verlag
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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