Intracrystalline Diffusivities and Surface Permeabilities Deduced from Transient Concentration Profiles:  Methanol in MOF Manganese Formate

The intracrystalline concentration profiles during molecular uptake of methanol by an initially empty, single crystal of microporous manganese(II) formate (Mn(HCO2)2), representing an ionic inorganic−organic hybrid within the MOF family, are monitored by interference microscopy. Within these profile...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2007-06, Vol.129 (25), p.8041-8047
Main Authors: Kortunov, Pavel V., Heinke, Lars, Arnold, Mirko, Nedellec, Yannic, Jones, Deborah J., Caro, Jürgen, Kärger, Jörg
Format: Article
Language:English
Subjects:
Chemical Sciences
Inorganic chemistry
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Summary:The intracrystalline concentration profiles during molecular uptake of methanol by an initially empty, single crystal of microporous manganese(II) formate (Mn(HCO2)2), representing an ionic inorganic−organic hybrid within the MOF family, are monitored by interference microscopy. Within these profiles, a crystal section could be detected where over the total of its extension (≈2 μm × 50 μm × 30 μm) molecular uptake ideally followed the pattern of one-dimensional diffusion. Analysis of the evolution of intracrystalline concentration in this section directly yields the permeability of the crystal surface and the intracrystalline diffusivity as a function of the concentration of the total range of 0 ≤ θ ≤ 0.57 covered in the experiments. Within this range, the surface permeability is found to increase by 1 order of magnitude, while, within the limits of accuracy (±30%), the transport diffusivity remains constant, thus reflecting the properties of the lattice gas model.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja071265h