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Processing Gray Selenium in Phosphonium-Based Ionic Liquids
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DOI：10.1021/acs.inorgchem.2c04094.png)
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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.
Keyword:
SE-77 NMR-SPECTROSCOPY
AMORPHOUS SELENIUM
CRYSTAL-STRUCTURE
POLYSELENIDE ELECTROLYTES
CRYSTALLIZATION KINETICS
POLYATOMIC CATIONS
SE
TELLURIUM
TE
SPECTRA
期刊
IF:
4.7
论文数:
4.9W
被引数:
10.5W
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