Methods for synthesizing frameworks bearingcoordinatively-unsaturated metal centers are being developed for applicationsin hydrogen storage, gas separations, and catalysis. Use of the triangularbridging ligand 1,3,5-benzenetristetrazol-5-yl (H3BTT) has led to anextensive family of cubic metal-organic frameworks of formulae M3[(M4Cl)3(BTT)8]2(M = Mg, Ca, Cr, Mn, Fe, Co, Ni, Cu, Cd) featuring open metal coordinationsites upon desolvation. Isostructural materials based upon the analogous triazolate and pyrazolatebridging ligands have also now been obtained, and are shown to exhibit greatlyenhanced thermal and chemical stability. Selected applications of thesematerials in heterogeneous catalysis will be presented, including their use asLewis acid catalysts that promote the cyanosilylation of aromatic aldehydes andketones and the Mukaiyama-aldol reaction.

Metal-organic frameworks with exposed metal sites: Applications
in heterogeneous catalysis

239th National Meeting (2010)

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