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Tribromide Ionic Liquids: Probing the Charge Distribution of the Anion by XPS

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Abstract

We investigate a typical trihalide ionic liquid, 1-octyl-3-methylimidazolium tribromide, using X‑ray photoelectron spectroscopy. The electronic environment of the anion is analyzed in detail. The Br 3d binding energies of the two components are both higher than that measured for 1-octyl-3-methylimidazolium bromide, due to the delocalization of the negative charge spreading over three atoms within the anion. The basicity of [Br3]– is estimated based upon N 1s binding energy. It is found similar to that of [BF4]–.

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ACKNOWLEDGMENTS

We thank Liaoning Provincial Foundation of Science and Technology (20180550482) for financial support. SM acknowledges Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics (Beijing Technology and Business University, Beijing 100048, China) for the award of an Open Fund (QETHSP2019004).

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Authors and Affiliations

  1. School of Environmental and Chemical Engineering, Shenyang Ligong University, 110159, Shenyang, China

    Rui Mu

  2. School of Material Science and Engineering, Shenyang Ligong University, 110159, Shenyang, China

    Aimin Deng & Shuang Men

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  1. Rui Mu
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  2. Aimin Deng
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  3. Shuang Men
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Correspondence to Aimin Deng or Shuang Men.

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Rui Mu, Deng, A. & Men, S. Tribromide Ionic Liquids: Probing the Charge Distribution of the Anion by XPS. Russ. J. Phys. Chem. 94, 1053–1056 (2020). https://doi.org/10.1134/S0036024420050167

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