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  Low Temperature Activation of Tellurium and Resource-Efficient Synthesis of AuTe2 and Ag2Te in Ionic Liquids

Grasser, M. A., Pietsch, T., Brunner, E., Doert, T., & Ruck, M. (2020). Low Temperature Activation of Tellurium and Resource-Efficient Synthesis of AuTe2 and Ag2Te in Ionic Liquids. ChemistryOpen, 9, 1-9. doi:10.1002/open.202000249.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-5D58-F Version Permalink: http://hdl.handle.net/21.11116/0000-0007-83A3-C
Genre: Journal Article

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 Creators:
Grasser, Matthias A.1, Author
Pietsch, Tobias1, Author
Brunner, Eike1, Author
Doert, Thomas1, Author
Ruck, Michael2, Author              
Affiliations:
1External Organizations, ou_persistent22              
2Michael Ruck, Max Planck Fellow, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863444              

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 Abstract: The low temperature syntheses of AuTe2 and Ag2Te 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. Ag2Te 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, 31P and 125Te-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. © 2020 The Authors. Published by Wiley-VCH GmbH

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Language(s): eng - English
 Dates: 2020-10-192020-10-19
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1002/open.202000249
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Title: ChemistryOpen
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 9 Sequence Number: - Start / End Page: 1 - 9 Identifier: ISSN: 2191-1363
CoNE: https://pure.mpg.de/cone/journals/resource/2191-1363