Understanding the Chemical Reactivity of Phosphonium-Based Ionic Liquids with Tellurium

Zhang T, Schwedtmann K, Weigand JJ, Doert T, Ruck M (2018)

Publication Type: Journal article

Publication year: 2018

Journal

Chemistry - A European Journal Wiley

Book Volume: 24

Pages Range: 9325-9332

Journal Issue: 37

DOI: 10.1002/chem.201800320

Abstract

The chemical reactivity of phosphonium based ionic liquids (ILs) towards tellurium at temperatures above 220 °C was systematically investigated by a series of dissolution experiments, tracking the solute tellurium species by nuclear magnetic resonance, and characterizing the reaction products by X-ray diffraction and scanning electron microscopy. The initial step is the thermal elimination of an alkyl group of the phosphonium cation of the ILs, most probably via an SN2 mechanism. The addition of tellurium follows to form trialkylphosphane tellurides as evidenced by 31P and 125Te NMR spectroscopic experiments. The trialkylphosphane tellurides can serve as a tellurium reservoir for the formation of metal tellurides, like Bi2Te3 and Ag2Te. It was observed that trihexyltetradecylphosphonium chloride ([P6 6 6 14]Cl) shows a very weak reactivity that is reflected by a low solubility of tellurium, while trihexyltetradecylphosphonium dicyanamide/decanoate ([P6 6 6 14][N(CN)2]/[P6 6 6 14][decanoate]) and tetrabutylphosphonium decanoate ([P4 4 4 4][decanoate]) dissolve tellurium to a much higher extent. We attribute these observations to the different Lewis basicity of the anions of the ILs as main influencing factor.

Involved external institutions

Technische Universität Dresden DE Germany (DE)

How to cite

APA:

Zhang, T., Schwedtmann, K., Weigand, J.J., Doert, T., & Ruck, M. (2018). Understanding the Chemical Reactivity of Phosphonium-Based Ionic Liquids with Tellurium. Chemistry - A European Journal, 24(37), 9325-9332. https://doi.org/10.1002/chem.201800320

MLA:

Zhang, Tao, et al. "Understanding the Chemical Reactivity of Phosphonium-Based Ionic Liquids with Tellurium." Chemistry - A European Journal 24.37 (2018): 9325-9332.

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