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Zeitschrift für Naturforschung B

A Journal of Chemical Sciences

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IMPACT FACTOR 2017: 0.757

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1865-7117
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Monitoring the solvation process and stability of Eu2+ in an ionic liquid by in situ luminescence analysis

Laura Ruiz Arana
  • Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 2, 24118 Kiel, Germany
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/ Jacob Olchowka
  • Corresponding author
  • Département de Chimie Physique, Université de Genève, Quai Ernest Ansermet, 30 – Science II, 1211 Genève 4, Switzerland
  • CNRS, Université de Bordeaux, Bordeaux INP, ICMCB UMR 5026, Pessac, F-33600, France
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/ Huayna Terraschke
  • Corresponding author
  • Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 2, 24118 Kiel, Germany
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Published Online: 2018-11-22 | DOI: https://doi.org/10.1515/znb-2018-0201

Abstract

Ionic liquids (ILs) offer the remarkable possibility of the direct synthesis of Eu2+-doped nanophosphors in solution, under atmospheric conditions, without the necessity of a high-temperature post-synthetic reduction from its trivalent oxidation state. This work uses for the first time in situ luminescence measurements for monitoring the solvation process of Eu2+ from the solid salt to the IL and its stability against oxidation under atmospheric conditions. Upon the addition of EuBr2 to 1-butyl-3-methyl-imidazolium tetrafluoroborate, the formation of the solvation shell is detected by the shift of the emission band at approximately 24 100 cm−1 assigned to the 5d→4f electronic transitions of Eu2+ within EuBr2 to approximately 22 000 cm−1, assigned to Eu2+ within BminBF4, tracking the time-dependent influence of the Eu2+ coordination environment on the crystal field splitting of its d orbitals. Even though the solubility of EuBr2 was demonstrated to be improved by reducing the concentration and increasing the temperature to 60°C, the performance of reactions at room temperature is recommended for future synthesis of Eu2+ materials in ILs due to the slight oxidation to Eu3+ observed upon heating.

This article offers supplementary material which is provided at the end of the article.

Keywords: dissolving process; Eu2+; ILACS; ionic liquid; luminescence

Dedicated to: Professor Wolfgang Bensch on the occasion of his 65th birthday.

References

About the article

Received: 2018-10-11

Accepted: 2018-10-31

Published Online: 2018-11-22


Citation Information: Zeitschrift für Naturforschung B, 20180201, ISSN (Online) 1865-7117, ISSN (Print) 0932-0776, DOI: https://doi.org/10.1515/znb-2018-0201.

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