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Issue 30, 2010
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Zeolitic polyoxometalates metal organic frameworks (Z-POMOF) with imidazole ligands and ε-Keggin ions as building blocks; computational evaluation of hypothetical polymorphs and a synthesis approach

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Abstract

We investigate here a new family of zeolitic Metal Organic Frameworks (MOFs) based on imidazole (im) as the ligand and ε-type Keggin PolyOxoMetalates (POMs) as building units. The POM used in this study is the ε-{PMo12O40} Keggin isomer capped by four Zn(II) ions (noted ε-Zn) in tetrahedral coordination. We describe here our methods to first construct and then evaluate the stability of hypothetical 3-D POMOFs possessing a tetrahedral network, typified by dense silica polymorphs and zeotypes and referred here to as Z-POMOFs. We use the analogy between the connectivity of silicon ion in dense minerals or zeolites and the ε-Zn, using imidazolate ligands to mimic the role of oxygen atoms in zeolites. Handling the ε-Keggin and imidazole as the constitutive building-blocks, a selection of 40 polymorphs were constructed and their relative stabilities computed. Among these Z-POMOFs, the cristobalite-like and zni-structure were identified as the most stable candidates. In parallel, we have attempted to synthesize Z-POMOF structures with ε-Zn POMs, synthesized in situ under hydrothermal conditions, and imidazole ligands. We present our first experimental result, the extended material [NBu4][PMoV8MoVI4O37(OH)3Zn4(im)(Him)], named ε(im)2. The structure of the hybrid framework is built by the connection of dimerized ε-Zn POMs to imidazole ligands in two directions. The obtaining of the first POMOF based on imidazole ligand is an encouraging step towards the synthesis of a new family of POMOFs.

Graphical abstract: Zeolitic polyoxometalates metal organic frameworks (Z-POMOF) with imidazole ligands and ε-Keggin ions as building blocks; computational evaluation of hypothetical polymorphs and a synthesis approach

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Publication details

The article was received on 12 Mar 2010, accepted on 08 Jun 2010 and first published on 30 Jun 2010


Article type: Paper
DOI: 10.1039/C004234J
Citation: Phys. Chem. Chem. Phys., 2010,12, 8632-8639
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    Zeolitic polyoxometalates metal organic frameworks (Z-POMOF) with imidazole ligands and ε-Keggin ions as building blocks; computational evaluation of hypothetical polymorphs and a synthesis approach

    L. M. Rodriguez Albelo, A. R. Ruiz-Salvador, D. W. Lewis, A. Gómez, P. Mialane, J. Marrot, A. Dolbecq, A. Sampieri and C. Mellot-Draznieks, Phys. Chem. Chem. Phys., 2010, 12, 8632
    DOI: 10.1039/C004234J

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