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

Laura Ruiz Arana 1 , Jacob Olchowka 2 , 3 ,  and Huayna Terraschke 1
  • 1 Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 2, 24118 Kiel, Germany
  • 2 Département de Chimie Physique, Université de Genève, Quai Ernest Ansermet, 30 – Science II, 1211 Genève 4, Switzerland
  • 3 CNRS, Université de Bordeaux, Bordeaux INP, ICMCB UMR 5026, Pessac, F-33600, France
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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and Huayna Terraschke
  • Corresponding author
  • Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 2, 24118 Kiel, Germany
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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.

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Zeitschrift für Naturforschung B is an international scientific journal which publishes original papers, microreviews, and letters from all areas of inorganic chemistry, solid state chemistry, coordination chemistry, molecular chemistry, and organic chemistry.

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