Three organic–inorganic hybrid B-Anderson polyoxoanions as building blocks: syntheses, structures, and characterization of [(C₆H₅NO₂)₂Ln(H₂O)₆](CrMo₆O₂₄H₆)·2C₆H₅NO₂·6H₂O (Ln = Sm, Dy, Er)

Abstract

Three new B-Anderson type polyoxometalates, [(C₆H₅NO₂)₂Ln(H₂O)₆](CrMo₆O₂₄H₆)·2C₆H₅NO₂·6H₂O (Ln = Sm 1, Dy 2 and Er 3), have been synthesized in aqueous solution and structurally characterized by single-crystal X-ray diffraction, IR spectra, UV spectroscopy, and fluorescence spectroscopy. Crystal structure analysis reveals that these three compounds have the same composition and are isostructural, assembled by B-Anderson type polyoxoanion [CrMo₆O₂₄H₆]³⁻, rare-earth ions, and ligands. UV spectroscopy shows that 1 is stable when pH is 4.50–5.83. The fluorescence spectra of 2 indicate that both rare-earth ions Dy³⁺ and pyridine-4-carboxylic acid ligands function in the charge transition of the compound.

Keywords:

• Polyoxometalates
• B-Anderson type
• Syntheses
• Crystal structure

Acknowledgments

This study was supported by the Nature Science Foundation of China, the Program for New Century Excellent Talent in University of Henan Province, the Foundation of Educational Department of Henan Province, and the Natural Science Foundation of Henan Province.