An ordered zeolite MFI film has been prepared on the substrate of a {001} basal face of high-quality large silicalite-1 crystals by epitaxial growth.

We demonstrate a novel strategy for the preparation of mesoporous silica-supported, highly dispersed, stable metal and bimetal nanoparticles with both size and site control. The supporting mesoporous silica, functionalized by polyaminoamine (PAMAM) dendrimers, is prepared by repeated Michael addition with methyl acrylates (MA) and amidation reaction with ethylenediamine (EDA) ok? by using aminopropyl-functionalized mesoporous silica as the starting material. The encapsulation of metal nanoparticles within the dendrimer-propagated mesoporous silica is achieved by the chemical reduction of metal-salt-impregnated dendrimer-mesoporous silica by using aqueous hydrazine. The site control of the metal or bimetal nanoparticles is accomplished by the localization of inter-or intradendrimeric nanoparticles within the mesoporous silica tunnels. The size of the encapsulated nanoparticles is controlled by their confinement to the nanocavity of the dendrimer and the mesopore ok? For Cu and Pd, particles locate at the lining of mesoporous tunnels, and have diameters of less than 2.0nm ok? For Pd/Pt, particles locate at the middle of mesoporous tunnels and have diameters in the range of 2.0-4.2nm ok?. The Pd and Pd/Pt nanoparticles are very stable in air, whereas the Cu nanoparticles are stable only in an inert atmosphere.

Metal-organic framework (MOF) coordination polymers have attracted tremendous attention because of their intriguing molecular topologies and their potentially useful ionexchange, adsorption, catalytic, fluorescence, and magnetic properties. [1-7] By taking advantage of the well-defined coordination geometries of metal centers as nodes, the structures of various minerals, such as quartz diamond,[8, 9] perovskite, [10] rutile, [11] PtS, [12, 13] and feldspar,[14] with specific functionalities, have been artificially reproduced by replacing monoatomic anions (O2, S2) with polyatomic organic bridging ligands as linkers. To meet the increasing demand for large-pore frameworks that are suitable for catalyzing reactions of large molecules, successful synthetic strategies for the preparation of large-pore metal-organic polymers with a genuine zeolite topology are still a huge challenge.

Zeolites with uniform micropores have been used as selec-tive catalysts and adsorbents owing to their ability to permit small molecules to enter their pores while leaving larger mole-cules behind, or to allow small molecules to pass through the pores prior to larger molecules.[1] In the past ten years, much effort has been made to develop zeolite membranes for sepa-ration and catalysis applications.[2 11] Zeolite NaA possesses uniform pores of 4 A in size, which falls between the molecu-lar size of O2 and N2 (O2:3.8A

layered coordination polymer Co(PDC)(H2O)2?H2O containing two helical chains was synthesized, and the resultant crystals were not racemic as evidenced by the observation of strong signals in vibrational circular dichroism (VCD) spectra.