Raman Spectroscopy Evidence of 1:1:1 Complex Formation during Dissolution of WO3 in a Melt of K2S2O7: K2SO4

Rolf W. Berg, Irene Maijó Ferré, Susan Jeanne Cline Schäffer

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Abstract

Highly inert yellow solid WO3 was found to be soluble in considerable amounts in molten K2S2O7 at elevated temperatures (650 8C), if only similar molar amounts of sulfates were also present. The dissolution reaction of WO3 into a melt consisting of a 1:1 molar mixture of K2S2O7 and K2SO4 was studied in detail, and Raman spectroscopy was used to characterize the products. In combination with single crystal X-ray crystal structure determination, it was shown that a new dimeric compound, K8[{WO2(SO4)2}2(m-SO4)2], was formed and its assigned Raman spectrum at room temperature is given. The (WO2)2+ cores of the dimeric complex have their symmetrical and antisymmetrical stretching modes nu1((WO2)2+) and nu3((WO2)2+) at around 1054 (strong) and 1042 (weak), and the bending mode nu2((WO2)2+) at around 292 (medium intensity), respectively (positions given in cm-1).
Original languageEnglish
JournalVibrational Spectroscopy
Volume42
Issue number2
Pages (from-to)346–352
ISSN0924-2031
DOIs
Publication statusPublished - 2006

Bibliographical note

The authors acknowledge Bodil Holten and Lise Lotte Berring of the Technical University of Denmark for preparative and crystallographic help. I.M. Ferre thanks the Erasmus Program of the European Union for a studentship

Keywords

  • Assignment; Dissolution; K2SO4; K2S2O7; K8[{WO2(SO4)2}2(SO4)2]; Melt; Raman; Solid; Spectroscopy; Tungsten oxide; WO3

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