hide
Free keywords:
Nuclear magnetic resonance spectroscopy, Quantum chemistry, Raman spectroscopy, Selenium compounds, Tellurium compounds, Acetate anions, Cationics, Electrochemical method, NMR and Raman spectroscopy, Phosphonium-based ionic liquids, Quantum chemical calculations, Quantum-chemical calculation, Se species, UV-Raman spectroscopy, UV/ Vis spectroscopy, Ionic liquids
Abstract:
The dissolution of gray selenium in tetraalkylphosphonium acetate ionic liquids was investigated by UV-vis, NMR, and Raman spectroscopy as well as quantum chemical calculations and electrochemical methods. Acetate anions and tetraalkylphosphonium cations facilitate the formation and stabilization of oligoselenides Sen2- and cationic Se species in the ionic liquid phase. Chemical exchange of selenium atoms was demonstrated by variable-temperature 77Se NMR experiments. Additionally, uncharged cycloselenium molecules exist at high selenium concentrations. Upon dilution with ethanol, amorphous red selenium precipitates from the solution. Moreover, crystalline Se1-xTex solid solutions precipitate when elemental tellurium is added to the mixture as confirmed by powder X-ray diffraction and Raman spectroscopy. © 2023 American Chemical Society.
