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  • Title: Hydrogen storage in a microporous metal-organic framework with exposed Mn2+ coordination sites.
    Author: Dincă M, Dailly A, Liu Y, Brown CM, Neumann DA, Long JR.
    Journal: J Am Chem Soc; 2006 Dec 27; 128(51):16876-83. PubMed ID: 17177438.
    Abstract:
    Use of the tritopic bridging ligand 1,3,5-benzenetristetrazolate (BTT3-) enables formation of [Mn(DMF)6]3[(Mn4Cl)3(BTT)8(H2O)12]2.42DMF.11H2O.20CH3OH, featuring a porous metal-organic framework with a previously unknown cubic topology. Crystals of the compound remain intact upon desolvation and show a total H2 uptake of 6.9 wt % at 77 K and 90 bar, which at 60 g H2/L provides a storage density 85% of that of liquid hydrogen. The material exhibits a maximum isosteric heat of adsorption of 10.1 kJ/mol, the highest yet observed for a metal-organic framework. Neutron powder diffraction data demonstrate that this is directly related to H2 binding at coordinatively unsaturated Mn2+ centers within the framework.
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