Microwave synthesis, structure, and properties of molybdophosphate compounds

Abstract

Two compounds of disphosphopentamolybdate(VI) with the formulae (C₄H₁₄N₂O)₃- [P₂Mo₅O₂₃] · 3H₂O (1) and (C₄H₁₄N₂O)₅(NH₄)₂[P₂Mo₅O₂₃]₂ · 5H₂O (2) have been synthesized by a simple, fast and efficient microwave method, and their crystal structures and spectroscopic properties have been studied. The heteropoly anion [P₂Mo₅O₂₃]⁶⁻ has a known structure built of five MoO₆ octahedra and two PO₄ tetrahedra. The MoO₆ octahedra form a pentagonal ring by sharing four edges and one corner and the PO₄ tetrahedra are attached to one side of the ring by three oxygen atoms. The most interesting feature of compound 1 is its extensive framework based on a one-dimensional zigzag chain. In compound 2, a more extensive and complicated framework of hydrogen bonds joins the anions, organic cations and water molecules together.

Keywords:

• Supermolecular compound
• Phosphopolyoxometallate complex
• Molybdenum complex
• Crystal structure
• Microwave synthesis

Acknowledgements

We thank the Natural Science Foundation (No. 05XLA08) of Xuzhou Normal University for financial support.