Isopoly Tungstate Anions in Water–Dimethyl Sulfoxide Solutions


Cite item

Full Text

Open Access Open Access
Restricted Access Access granted
Restricted Access Subscription Access

Abstract

The formation of isopoly tungstate anions (IPTAs) in water–dimethyl sulfoxide (DMSO) solutions was studied by potentiometric titration, followed by mathematical modeling, and electronic absorption spectroscopy. Logarithmic equilibrium constants and Gibbs free energies were calculated for IPTA formation from \(\rm{WO}_4^{2-}\) and Н+ in the \(\rm{WO}_4^{2-}\)–H+(DMSO = dimethyl sulfoxide) system for various solution acidities Z=v(H+)/v(\(\rm{WO}_4^{2-}\)). A scheme was suggested for IPTA interconversions at various DMSO contents in solution. Dimethyl sulfoxide was found to have a stabilizing effect on [W7O24]6– and [W10O32]4– anions. The distribution diagrams and the calculated thermodynamic parameters of IPTA formation were used to determine optimal conditions for preparing decatungstates from water–DMSO solutions, which consisted in using sodium tungstate solutions acidified to Z = 1.60 and containing ϕ(DMSO) = 40%.

About the authors

E. Yu. Poimanova

Donetsk National University

Author for correspondence.
Email: poymanovahe@gmail.com
Ukraine, Donetsk, 83001

S. V. Radio

Vasyl Stus Donetsk National University

Email: poymanovahe@gmail.com
Ukraine, Vinnitsa, 21021

E. E. Belousova

Donetsk National University

Email: poymanovahe@gmail.com
Ukraine, Donetsk, 83001

G. M. Rozantsev

Vasyl Stus Donetsk National University

Email: poymanovahe@gmail.com
Ukraine, Vinnitsa, 21021

V. T. Panyushkin

Kuban State University

Email: poymanovahe@gmail.com
Russian Federation, Krasnodar, 350040

Supplementary files

Supplementary Files
Action
1. JATS XML

Copyright (c) 2018 Pleiades Publishing, Ltd.