English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Chalcogenides by Reduction of their Dioxides in Ultra-Alkaline Media

MPS-Authors
/persons/resource/persons126823

Ruck,  Michael
Michael Ruck, Max Planck Fellow, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

External Resource
No external resources are shared
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Albrecht, R., & Ruck, M. (2021). Chalcogenides by Reduction of their Dioxides in Ultra-Alkaline Media. Angewandte Chemie, International Edition in English, 1-9. doi:10.1002/anie.202107642.


Cite as: http://hdl.handle.net/21.11116/0000-0009-2D9F-3
Abstract
The reaction of chalcogen dioxides ChO(2) (Ch=Se, Te) with As2O3 in a 30 molar KOH hydroflux at about 200 degrees C yielded crystals of potassium trichalcogenides K(2)Ch(3) with dimensions up to 2 cm. Arsenic trioxide acts as electron donor and is oxidized to arsenate(V). The new heterochalcogenide anion (TeSe2)(2-) formed when starting from SeO2 and TeO2 simultaneously. The compound K2TeSe2 crystallizes isostructural to K2S3 and K2Se3. The unexpected redox reaction as well as the precipitation of hygroscopic compounds from an aqueous solution are attributed to a strongly reduced activity of water. The reactions were studied by Raman and UV/Vis spectroscopy. Depending on the concentration of As2O3, colorless monochalcogenide Ch(2-) or orange Se-2(2-) and purple Te-2(2-) anions are dominating the solutions.