Hydrogen Storage in Microporous Coordination Solids with Exposed Metal Sites
Jeffrey R. Long, Dept. of Chemistry, University of California, Berkeley
Methods for synthesizing frameworks bearing coordinatively-unsaturated metal centers are being developed in order to increase the H2 binding enthalpy within microporous coordination solids. The porosity and hydrogen storage properties of the dehydrated Prussian blue analogues Ga[Co(CN)6], Fe4[Fe(CN)6]3, M3[Co(CN)6]2 (M = Mn, Fe, Co, Ni, Cu, Zn), M2[Fe(CN)6] (M = Mn, Co, Ni, Cu), and Co3[Co(CN)5]2 have been investigated. Means of incorporating metal carbonyl units within Zn4O(1,4-benzenedicarboxylate)3 have been devised, and attempts at decarbonylating the resulting materials will be described. In addition, the use of pyrazole- and tetrazole-based ligands for generating frameworks with open metal coordination sites will be discussed, with emphasis on a new sodalite-type framework exhibiting a high volumetric H2 storage capacity. The potential utility of such materials in hydrogen fuel cell-powered vehicles will be assessed.
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