Hydrothermal synthesis and structural characterization of two new polytungstate-based hybrids

Abstract

Two new polytungstate-based compounds, [Co(mbpy)₃][W₆O₁₉] (1) and [Ni(mbpy)₃]₂[VW₁₂O₄₀] (2) (mbpy = 4,4′-dimethyl-2,2′-bipyridyl), have been hydrothermally synthesized and characterized by IR spectroscopy, TG analysis, and single-crystal X-ray diffraction. Single crystal X-ray structural analyses demonstrate that the compounds consist of [M(mbpy)₃]²⁺ (M = Co^II or Ni^II) as cations anchored to W-containing polyoxoanions through non-covalent intermolecular interactions. The inorganic polyanions exhibit different cluster structures: Lindqvist-type [W₆O₁₉]²⁻ isopolyoxoanion in 1; V-centered Keggin-type [VW₁₂O₄₀]⁴⁻ heteropolyoxoanion in 2.

Keywords:

• Polyoxometalate
• Hydrothermal reaction
• Lindqvist
• Supramolecular interaction
• Bipyridine

Acknowledgments

This work was financially supported by the Natural Science Foundation of China (no. 20701011), Doctoral Initial Foundation of Hebei Normal University (no. L2005B13), the Hebei Natural Science Foundation of China (no. B2011205035), and the Education Department Foundation of Hebei Province (no. Z2006436).