Abstract
Hydrothermal methods have allowed the preparation of three two-dimensional materials constructed from octamolybdate clusters and secondary metal/tetra-2-pyridylpyrazine subunits. The δ-Mo8O264- cluster of [{Cu2(tpyprz)}2Mo8O26] is illustrated. The hydrothermal reactions of MoO3, tetra-2- pyridylpyrazine (tpyprz) and M(CH3CO2)2 • 2H2O (M = Co, Ni) yielded the two-dimensional oxides [M 2(tpyprz)(H2O)2Mo8O26] • xH2O [M = Co, x = 1.8 (1); M = Ni, x = 0.6 (2)]. However, the reaction of (NH4)6Mo7O24 • 4H2O, tpyprz and Cu(CH3CO2)2 • H2O produced [{Cu2(tpyprz)}2Mo 8O26] • 2H2O (3 • 2H2O). The isomorphous structures of 1 and 2 are constructed from α-Mo8O264- clusters linked through {M2(tpyprz)(H2O)2} 4+ subunits into two-dimensional networks. While the structure of 3 is also two-dimensional, the molybdate building block is present as the δ-isomer and the secondary-metal/ligand component consists of a one-dimensional {Cu2(tpyprz)}n2n+ chain. The structure of 3 is compared to that of the previously reported three-dimensional material [{Cu2(tpyprz)} 2Mo8O26] • 7H2O which contains ζ-Mo8O264-clusters and structurally distinct {Cu2(tpyprz)}n2n+ chains.
Original language | English (US) |
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Pages (from-to) | 116-122 |
Number of pages | 7 |
Journal | Inorganica Chimica Acta |
Volume | 358 |
Issue number | 1 |
DOIs | |
State | Published - Jan 1 2005 |
Keywords
- Bimetallic oxides
- Metal-organic framework
- Octamolybdate
- Polyoxometalate building blocks
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry