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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