11 research outputs found

    Design of lanthanide metal organic frameworks incorporating dicarboxylate ligands

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    International audienc

    Synthesis and Crystal Structures of Various Phases of the Microporous Three-Dimensional Coordination Polymer [Zr(OH)<sub>2</sub>(C<sub>2</sub>O<sub>4</sub>)]<sub><i>n</i></sub>

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    A homometallic Zr­(IV)-oxalate three-dimensional (3-D) coordination polymer of formula [Zr­(OH)<sub>2</sub>(C<sub>2</sub>O<sub>4</sub>)­·0.5H<sub>2</sub>O] is reported. This compound was found to be a microporous solid with reversible sorption abilities. Upon guest release and sorption, the crystalline material undergoes single crystal to single crystal transitions. The crystal structures for three phases have been solved from single crystal diffraction studies. They consist of the guest containing frameworks [Zr­(OH)<sub>2</sub>(C<sub>2</sub>O<sub>4</sub>)­·0.5H<sub>2</sub>O], <b>1</b>,<b> 3</b>, and the guest-free porous phase [Zr­(OH)<sub>2</sub>(C<sub>2</sub>O<sub>4</sub>)], <b>2</b>; all are found with tetragonal space group <i>I</i>4/<i>m</i>. Phase <b>1</b> has been obtained by controlled diffusion of the reagents (ZrO­(NO<sub>3</sub>)<sub>2</sub> and H<sub>2</sub>C<sub>2</sub>O<sub>4</sub>) in a silica gel medium; the other phases have been formed from <b>1</b> by thermal activation (<b>2</b>) and re-adsorption of H<sub>2</sub>O (<b>3</b>)

    Synthesis and Crystal Structures of Various Phases of the Microporous Three-Dimensional Coordination Polymer [Zr(OH)<sub>2</sub>(C<sub>2</sub>O<sub>4</sub>)]<sub><i>n</i></sub>

    No full text
    A homometallic Zr­(IV)-oxalate three-dimensional (3-D) coordination polymer of formula [Zr­(OH)<sub>2</sub>(C<sub>2</sub>O<sub>4</sub>)­·0.5H<sub>2</sub>O] is reported. This compound was found to be a microporous solid with reversible sorption abilities. Upon guest release and sorption, the crystalline material undergoes single crystal to single crystal transitions. The crystal structures for three phases have been solved from single crystal diffraction studies. They consist of the guest containing frameworks [Zr­(OH)<sub>2</sub>(C<sub>2</sub>O<sub>4</sub>)­·0.5H<sub>2</sub>O], <b>1</b>,<b> 3</b>, and the guest-free porous phase [Zr­(OH)<sub>2</sub>(C<sub>2</sub>O<sub>4</sub>)], <b>2</b>; all are found with tetragonal space group <i>I</i>4/<i>m</i>. Phase <b>1</b> has been obtained by controlled diffusion of the reagents (ZrO­(NO<sub>3</sub>)<sub>2</sub> and H<sub>2</sub>C<sub>2</sub>O<sub>4</sub>) in a silica gel medium; the other phases have been formed from <b>1</b> by thermal activation (<b>2</b>) and re-adsorption of H<sub>2</sub>O (<b>3</b>)

    The solid solution (Fe0.81Al0.19)(H2PO4)3 with a strong hydrogen bond

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    A sample of synthetic (Fe0.81Al0.19)(H2PO4)3 was prepared by hydro­thermal methods in order to determine the crystal structure. The compound is a new monoclinic variety (γ-form) and the structure is based on a two-dimensional framework of distorted corner-sharing MO6 (M = Fe, Al) polyhedra sharing corners with PO4 tetra­hedra
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