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Layered microporous tin(IV) bisphosphonates

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Maria del Mar Gomez-Alcantara, Aurelio Cabeza, Pascual Olivera-Pastor, Francisco Fernandez-Moreno, Isabel Sobrados, Jesus Sanz, Russell E. Morris, Abraham Clearfield, Miguel A. G. Aranda

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This article reports the hydrothermal synthesis and characterization of two new series of porous tin(IV) phosphonophenoxyphenylphosphonates with controlled pore size distributions, using as precursor the 4-(4'-phosphonophenoxy)phenyl phosphonic acid, [H2O3P-C6H4](2)-O. Supermicroporous solids (S-BET, 300-400 m(2) g(-1)) were obtained employing n-alcohol (C1-C6)-water mixtures (solvents ratio 1 : 1), in the presence of hydrofluoric acid. X-Ray powder diffraction shows that these compounds are semi-crystalline and the local environments around the phosphorus and tin elements have been studied by P-31 and Sn-119 MAS-NMR spectroscopy, respectively. The microstructure (particle sizes and shapes) of these phosphonates has been analyzed by scanning and transmission electron microscopy. This study shows that the microstructures of single-ligand (for instance tin(IV) phenylphosphonate) and cross-linked tin(IV) bisphosphonates are different. Tin(IV) phenylphosphonate crystallizes as micron-sized spheres, 0 similar to 1-2 mu m, formed by the aggregation of nanospheres, whereas tin(IV) bisphosphonates crystallize as microparticles larger than 20 mu m. The textural properties of these porous solids were characterized by N-2, and CO2 sorption isotherms. The key result of this work is that maxima of pore size distributions smoothly shift from 12 to 16 angstrom upon increasing the chain length of the alcohol. The microporosity of tin(IV) bisphosphonates is compatible with a double role played by the phosphonate groups acting as a pillar between adjacent layers and as a component of the hybrid organic-inorganic layers.



Original languageEnglish
Pages (from-to)2394-2404
Number of pages11
JournalDalton Transactions
Issue number23
Publication statusPublished - 2007

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