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Abstract <p>Single crystals of complex hexafluoridoindate hydrate Rb<sub>4</sub>[Cu<sup>2+</sup>(H<sub>2</sub>O)<sub>6</sub>](InF<sub>6</sub>)<sub>2</sub>[Cu<sup>+</sup>(OH)(H<sub>2</sub>O)<sub>5</sub>]<sub><i>x</i></sub>(H<sub>2</sub>O)<sub>6–6<i>x</i></sub> (<i>x</i>&#xa0;=&#xa0;0.08) with mixed cations are synthesized for the first time. Its crystal structure is studied. It is composed of Rb<sup>+</sup> cations surrounded by five fluorine atoms and three water oxygen atoms, complex octahedral [Cu(H<sub>2</sub>O)<sub>6</sub>]<sup>2+</sup> cations, [InF<sub>6</sub>]<sup>3–</sup> anions, and crystallization water molecules. A certain amount of monovalent copper atoms are embedded into the space of crystallization water molecules in the form of its linear diaqua ion H<sub>2</sub>O–Cu<sup>+</sup>–OH<sub>2</sub> with short Cu–O distances of 1.78(2)&#xa0;Å and 1.83(2)&#xa0;Å. It is completed to a tetragonal bipyramid by three water molecules and an OH group at significantly longer distances (2.51(3)-2.75(3)&#xa0;Å). The presence of Cu<sup>+</sup> and OH<sup>–</sup> in the complex is indirectly confirmed by IR and X-ray photoelectron spectroscopy (XPS). Under XPS experimental conditions, degradation of the compound is observed, which is accompanied by dehydration, hydrolysis, and considerable Cu<sup>2+</sup> reduction.</p>

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New Mixed-Cation Hexafluoridoindate(III) Hydrate of Rubidium and Heterovalent Copper

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • A. A. Udovenko,
  • N. B. Bolotina,
  • V. V. Korochentsev,
  • V. B. Logvinova

摘要

Abstract

Single crystals of complex hexafluoridoindate hydrate Rb4[Cu2+(H2O)6](InF6)2[Cu+(OH)(H2O)5]x(H2O)6–6x (x = 0.08) with mixed cations are synthesized for the first time. Its crystal structure is studied. It is composed of Rb+ cations surrounded by five fluorine atoms and three water oxygen atoms, complex octahedral [Cu(H2O)6]2+ cations, [InF6]3– anions, and crystallization water molecules. A certain amount of monovalent copper atoms are embedded into the space of crystallization water molecules in the form of its linear diaqua ion H2O–Cu+–OH2 with short Cu–O distances of 1.78(2) Å and 1.83(2) Å. It is completed to a tetragonal bipyramid by three water molecules and an OH group at significantly longer distances (2.51(3)-2.75(3) Å). The presence of Cu+ and OH– in the complex is indirectly confirmed by IR and X-ray photoelectron spectroscopy (XPS). Under XPS experimental conditions, degradation of the compound is observed, which is accompanied by dehydration, hydrolysis, and considerable Cu2+ reduction.