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From non-porous crystalline to amorphous microporous metal(IV) bisphosphonates

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Author(s)

Aurelio Cabeza, Maria del Mar Gomez-Alcantara, Pascual Olivera-Pastor, Isabel Sobrados, Jesu Sanz, Bo Xiao, Russell E. Morris, Abraham Clearfield, Miguel A. G. Aranda

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Abstract

Porous layered hybrid materials have been prepared by the reaction of organo-bisphosphonate ligands, 4-(4'-phosphonophenoxy)phenylphosphonic, 4,4'-biphenylenbisphosphonic and phenylphosphonic acids, with metal(IV) cations (Zr and Sn). Crystalline Zr(IV) and Sn(IV) layered bisphosphonates were also prepared, which were non-porous. The amorphous M(IV) bisphosphonates showed variable compositions and textural properties ranging from mainly mesoporous to highly microporous solids with BET surface areas varying from 300 to 480 m(2) g(-1), micropore volumes ranging 0.10-0.20 cm(3)/g, and narrow porous size distributions for some materials. N-2 isotherms suggest that Sn(IV) derivatives show a comparatively higher micropore contribution than the Zr(IV) analogous at least for the ether-bisphosphonate hybrids. Sn(IV) bisphosphonates exhibit high microporosities without the need of using harmful DMSO as solvent. If ether-bisphosphonic acid is partially replaced by less expensive phenylphosphonic ligand, porous products are also obtained. P-31 and F-17 MAS NMR and XPS data revealed the presence of hydrogen-phosphonate groups and small (F-, Cl- and OH-) anions, which act as spacer ligands within the inorganic layers, in these hybrid materials. The complexity of the inorganic layers is higher for the Sn(IV) bisphosphonates likely due to the larger amount of small bridging anions including fluorides. It is suggested that the presence of these small inorganic ligands may be a key factor influencing both, the interaction of the inorganic layer with the bisphosphonate groups, which bridge the inorganic layers, and the generation of internal voids within a given inorganic layer. Preliminary studies of gases adsorption (H-2 and NO) have been carried out for selected Sn(IV) bisphosphonates. The H-2 adsorption capacity at 77 K and 1 bar was low, 0.26 wt%, but the NO adsorption capacity at similar to 1 bar and 298 K was relatively high, 4.2 wt%. Moreover, the hysteresis in the NO isotherms is indicative of partial strong irreversible adsorption of NO. (C) 2008 Elsevier Inc. All rights reserved.

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Original languageEnglish
Pages (from-to)322-336
Number of pages15
JournalMicroporous and Mesoporous Materials
Volume114
DOIs
Publication statusPublished - 1 Sep 2008

    Research areas

  • hybrid porous materials, microporosity, Sn(IV) bisphosphonates, Zr(IV) bisphosphonates, P-31 MAS NMR, MESOPOROUS ALUMINUM PHOSPHONATES, GAMMA-ZIRCONIUM PHOSPHATE, NANOPOROUS METALOFLUOROPHOSPHATES, HYDROTHERMAL SYNTHESIS, HYDROGEN STORAGE, POROUS MATERIALS, POWDER DATA, P-31 NMR, TITANIUM, PHENYLPHOSPHONATE

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