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Abstract <p>Aqua complexes [M(H<sub>2</sub>O)<sub>8</sub>]<sub>2</sub>[B<sub>12</sub>H<sub>12</sub>]<sub>3</sub>·15H<sub>2</sub>O (M = Eu<sup>3+</sup>, Gd<sup>3+</sup>, Yb<sup>3+</sup>) and [Ce(H<sub>2</sub>O)<sub>9</sub>]<sub>2</sub>[B<sub>12</sub>H<sub>12</sub>]<sub>3</sub>·15H<sub>2</sub>O stabilized by the <i>closo</i>-dodecaborate anion have been synthesized by neutralization of an (H<sub>3</sub>O)<sub>2</sub>[B<sub>12</sub>H<sub>12</sub>] solution with rare earth (RE) oxides M<sub>2</sub>O<sub>3</sub> (M = Eu<sup>3+</sup>, Gd<sup>3+</sup>, Yb<sup>3+</sup>) and CeO<sub>2</sub>. The structures of [Eu(H<sub>2</sub>O)<sub>8</sub>]<sub>2</sub>[B<sub>12</sub>H<sub>12</sub>]<sub>3</sub>·15H<sub>2</sub>O and [Ce(H<sub>2</sub>O)<sub>9</sub>]<sub>2</sub>[B<sub>12</sub>H<sub>12</sub>]<sub>3</sub>·15H<sub>2</sub>O have been determined by single-crystal X-ray diffraction analysis. It has been demonstrated that the reaction in the СеО<sub>2</sub>/(H<sub>3</sub>O)<sub>2</sub>[B<sub>12</sub>H<sub>12</sub>] system is accompanied by the redox transformation Ce<sup>4+</sup> → Ce<sup>3+</sup>, while for the M<sub>2</sub>O<sub>3</sub> (M = Eu<sup>3+</sup>, Gd<sup>3+</sup>, Yb<sup>3+</sup>)/(H<sub>3</sub>O)<sub>2</sub>[B<sub>12</sub>H<sub>12</sub>] systems, the oxidation state of the corresponding RE cation remains unchanged. Studying the luminescent properties of [Ce(H<sub>2</sub>O)<sub>9</sub>]<sub>2</sub>[B<sub>12</sub>H<sub>12</sub>]<sub>3</sub>·15H<sub>2</sub>O has shown that this compound emits in the near ultraviolet region with an emission maximum at 370 nm.</p>

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Aqua Complexes of Rare Earth Metals (Ce3+, Eu3+, Gd3+, and Yb3+) with closo-Dodecaborate Anion: Synthesis, Structure, and Properties

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • I. I. Myshletsov,
  • E. A. Malinina,
  • A. S. Kubasov,
  • G. A. Buzanov,
  • L. V. Goeva,
  • S. E. Nikiforova,
  • A. G. Son,
  • N. T. Kuznetsov

摘要

Abstract

Aqua complexes [M(H2O)8]2[B12H12]3·15H2O (M = Eu3+, Gd3+, Yb3+) and [Ce(H2O)9]2[B12H12]3·15H2O stabilized by the closo-dodecaborate anion have been synthesized by neutralization of an (H3O)2[B12H12] solution with rare earth (RE) oxides M2O3 (M = Eu3+, Gd3+, Yb3+) and CeO2. The structures of [Eu(H2O)8]2[B12H12]3·15H2O and [Ce(H2O)9]2[B12H12]3·15H2O have been determined by single-crystal X-ray diffraction analysis. It has been demonstrated that the reaction in the СеО2/(H3O)2[B12H12] system is accompanied by the redox transformation Ce4+ → Ce3+, while for the M2O3 (M = Eu3+, Gd3+, Yb3+)/(H3O)2[B12H12] systems, the oxidation state of the corresponding RE cation remains unchanged. Studying the luminescent properties of [Ce(H2O)9]2[B12H12]3·15H2O has shown that this compound emits in the near ultraviolet region with an emission maximum at 370 nm.