Low Temperature Activation of Tellurium and Resource-Efficient Synthesis of AuTe2 and Ag2 Te in Ionic Liquids
The low temperature syntheses of AuTe2 and Ag2 Te starting from the elements were investigated in the ionic liquids (ILs) [BMIm]X and [P66614 ]Z ([BMIm]+ =1-butyl-3-methylimidazolium; X = Cl, [HSO4 ]- , [P66614 ]+ = trihexyltetradecylphosphonium; Z = Cl- , Br- , dicyanamide [DCA]- , bis(trifluorome...
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Published in | ChemistryOpen (Weinheim) Vol. 10; no. 2; pp. 117 - 124 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
01.02.2021
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Online Access | Get full text |
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Summary: | The low temperature syntheses of AuTe2 and Ag2 Te starting from the elements were investigated in the ionic liquids (ILs) [BMIm]X and [P66614 ]Z ([BMIm]+ =1-butyl-3-methylimidazolium; X = Cl, [HSO4 ]- , [P66614 ]+ = trihexyltetradecylphosphonium; Z = Cl- , Br- , dicyanamide [DCA]- , bis(trifluoromethylsulfonyl)imide [NTf2 ]- , decanoate [dec]- , acetate [OAc]- , bis(2,4,4-trimethylpentyl)phosphinate [BTMP]- ). Powder X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy revealed that [P66614 ]Cl is the most promising candidate for the single phase synthesis of AuTe2 at 200 °C. Ag2 Te was obtained using the same ILs by reducing the temperature in the flask to 60 °C. Even at room temperature, quantitative yield was achieved by using either 2 mol % of [P66614 ]Cl in dichloromethane or a planetary ball mill. Diffusion experiments, 31 P and 125 Te-NMR, and mass spectroscopy revealed one of the reaction mechanisms at 60 °C. Catalytic amounts of alkylphosphanes in commercial [P66614 ]Cl activate tellurium and form soluble phosphane tellurides, which react on the metal surface to solid telluride and the initial phosphane. In addition, a convenient method for the purification of [P66614 ]Cl was developed. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 content type line 23 ObjectType-Feature-2 |
ISSN: | 2191-1363 |
DOI: | 10.1002/open.202000249 |