Assembly of Three Scandium-containing Heteropolytungstates Based on a Building-block Synthetic Strategy

Abstract

Three novel scandium-containing heteropolytungstates [Sc₃(H₂O)₃NO₃(PW₉O₃₄)₂]¹⁰⁻(1a), [Sc₈(H₂O)₂(GeW₉O₃₄)₂(GeW₆O₂₆)₂]¹²⁻(2a) and [Sc₁₁(W₆O₁₀)₂(OH)₂(H₂O)₁₆(BiW₉O₃₃)₆]²⁷⁻(3a) were synthesized by reactions of Sc^III ions with trilacunary Keggin precursors, [A-α-XW₉O₃₄] ⁱⁿ⁻(X=P, Ge, in=9, 10) or [B-α-BiW₉O₃₃]⁹⁻, in NaOAc/HOAc buffer solution under conventional synthetic condition, respectively. All the three compounds were characterized by means of single-crystal X-ray diffraction(XRD), Fourier transform-infrared(FTIR) spectroscopy ul-traviolet-visible(UV-Vis) spectroscopy, elemental analysis, and thermogravimetric analysis. The aqueous solution stability of the sandwich polyanion [Sc₃(H₂O)₃NO₃(PW₉O₃₄)₂]¹⁰⁻ was also verified by electrospray ionization mass spectrometry(ESI-MS) due to its good solubility in water.

Keywords

Scandium / Heteropolytungstate / Building-block / Synthesis / Crystal structure

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