A polyoxoniobate constructed from Lindqvist-type hexaniobates and copper coordinated cations

Abstract

A new organic–inorganic hybrid polyoxoniobate [Cu(1,3-dap)₂(H₂O)][(H₆Nb₆O₁₉)₂Cu(1,3-dap)₂] · 4(1,3-dap)·20H₂O (1) (1,3-dap = 1,3-diaminopropane) has been synthesized by the diffusion method and structurally characterized by elemental analyses, infrared spectrum, ultraviolet spectroscopy, and single crystal X-ray diffraction. Crystal structure analysis reveals that 1 consists of a dimeric dumbbell anion [(H₆Nb₆O₁₉)₂Cu(1,3-dap)₂]²⁻, a copper coordinated cation, four 1,3-dap ligands and 20 crystal water molecules. Neighboring units are combined via hydrogen bonds forming a 3-D supramolecular framework.

Keywords:

• Polyoxoniobate
• Lindqvist-type
• Synthesis
• Crystal structure

Acknowledgments

This work was financially supported by the Natural Science Foundation of China, Special Research Fund for the Doctoral Program of Higher Education, Innovation Scientists and Technicians Troop Construction Projects of Henan Province, Natural Science Foundation of Henan Province.