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Abstract <p>Crystals of the [Co(en)<sub>3</sub>][Co(NO<sub>2</sub>)<sub>6</sub>]·3H<sub>2</sub>O (<b>1</b>) double complex salt (DCS) are prepared upon isothermal evaporation of an aqueous solution containing [Co(en)<sub>3</sub>]Cl<sub>3</sub> and Na<sub>3</sub>[Co(NO<sub>2</sub>)<sub>6</sub>] in the 1:1 molar ratio. The new compound is trigonal, space group <i>R</i>32, <i>a</i>&#xa0;=&#xa0;12.9915(4)&#xa0;Å, <i>c</i>&#xa0;=&#xa0;11.7113(4)&#xa0;Å, <i>V</i>&#xa0;=&#xa0;1711.81(9)&#xa0;Å<sup>3</sup>. Its crystal structure is characterized by partial disorder due to the incompatibility local symmetry of the [Co(NO<sub>2</sub>)<sub>6</sub>]<sup>3–</sup> anion and the overall symmetry of the structure. In contrast to most DCSs containing structurally similar [Co(NH<sub>3</sub>)<sub>6</sub>]<sup>3+</sup> cation, the hydrate <b>1</b> is well soluble in water.</p>

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Synthesis and Crystal Structure of the [Co(en)3][Co(NO2)6]·3H2O Double Complex Salt

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • D. O. Charkin,
  • V. E. Kireev,
  • S. N. Volkov,
  • A. A. Kompanchenko,
  • S. M. Aksenov,
  • A. N. Gosteva

摘要

Abstract

Crystals of the [Co(en)3][Co(NO2)6]·3H2O (1) double complex salt (DCS) are prepared upon isothermal evaporation of an aqueous solution containing [Co(en)3]Cl3 and Na3[Co(NO2)6] in the 1:1 molar ratio. The new compound is trigonal, space group R32, a = 12.9915(4) Å, c = 11.7113(4) Å, V = 1711.81(9) Å3. Its crystal structure is characterized by partial disorder due to the incompatibility local symmetry of the [Co(NO2)6]3– anion and the overall symmetry of the structure. In contrast to most DCSs containing structurally similar [Co(NH3)6]3+ cation, the hydrate 1 is well soluble in water.