Synthesis of Zinc Paratungstate B.
DOI:
https://doi.org/10.31558/2617-0876.2017.1.5Keywords:
paratungstate B anion, isopoly tungstate, Zinc (II), FTIR spectroscopyAbstract
The procedure for crystalline zinc paratungstate B Zn5[W12O40(ОН)2]∙35H2O synthesis from the acidified up to Z = ν(H+)/ν(WO2–4)= 1,29 solution of the Na2WO4–HNO3–ZnSO4–H2O system under acetone adding (v/v ratio H2O:acetone = 1:1) was elaborated. By the FTIR spectroscopy method it was established that the positions of absorption maxima of stretching vibrations in the W–O–W framework are in good agreement with the previous determined for paratungstate B salts with other cations, the structure of which were determined by X–ray single crystal analysis. It has been established that the formation of an individual zinc paratungstate B does not occur in solution at acidity Z = 1.17, while a solid phase containing up to 10 % of the sulfate anion precipitates as a result of salting out with acetone.Z = ν(H<sup>+</sup>)/ν(WO<sup>2–</sup><sub>4</sub>)= 1,29
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