Thermochemical Properties of the Dissolution of Rubidium d-Gluconate Rb[d-C6H11O7]2(s) in Aqueous Solutions

  • You-Ying Di
  • Yu-Pu Liu
  • Yu-Xia Kong
  • Chun-Sheng Zhou
  • Sheng-Li Gao
Article
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Abstract

A novel coordination compound rubidium d-gluconate Rb[d-C6H11O7](s) has been synthesized and characterized by chemical analysis, elemental analysis, and X-ray diffraction. Single-crystal X-ray analysis reveals that the crystal is monoclinic with space group P21 and Z = 2. Also, the d-gluconate anion in Rb[d-C6H11O7](s) has a bent-chain conformation, in which the carbon atoms of the anion form two approximate planes. The compound exhibits an obvious chelation of the d-gluconate anions to the rubidum(I) cation and the cation is seven-coordinated to all seven oxygen atoms. The lattice potential energy and ionic volume of the anion d-\( {\text{C}}_{ 6} {\text{H}}_{ 1 1} {\text{O}}_{7}^{ - } \) were obtained to be UPOT = 484.23 kJ·mol−1 and V = 0.2004 nm3 from crystallographic data. Molar enthalpies of dissolution of Rb[d-C6H11O7](s) in double-distilled water at various molalities were measured by use of an isoperibol solution–reaction calorimeter at T = 298.15 K. According to Pitzer’s electrolyte solution model, the molar enthalpy of dissolution of the title compound at infinite dilution was determined to be \( \Delta_{\text{s}} H_{\text{m}}^{\infty } = (29.76 \pm 0.72){\text{ kJ}}{\cdot}{\text{mol}}^{ - 1} \). The values of the apparent relative molar enthalpies (\( ^{\phi } L_{{}} \)) of the title compound and relative partial molar enthalpies (\( \bar{L}_{2} \) and \( \bar{L}_{1} \)) of the solute and the solvent at different concentrations were derived from the experimental enthalpies of dissolution of the compound. Furthermore, the molar enthalpy of hydration of the anion d-\( {\text{C}}_{ 6} {\text{H}}_{ 1 1} {\text{O}}_{7}^{ - } \) was calculated to be ΔH = − (166.4 ± 2.7) kJ·mol−1 by use of a thermochemical cycle.

Keywords

Rubidium d-gluconate Crystal structure Lattice potential energy Isoperibol solution–reaction calorimeter Molar enthalpy of dissolution at infinite dilution Molar enthalpy of hydration 

Notes

Acknowledgements

This work was financially supported by the National Natural Science Foundations of China under contracts NSFC Nos. 21273100 and 21273171, and Plan Project of Science and Technology of Shangluo city in China under the Project Number SK2015-21.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • You-Ying Di
    • 1
  • Yu-Pu Liu
    • 2
  • Yu-Xia Kong
    • 2
  • Chun-Sheng Zhou
    • 1
  • Sheng-Li Gao
    • 1
  1. 1.College of Chemical Engineering and Modern MaterialsShangluo University/Shaanxi Key Laboratory of Comprehensive Utilization of Tailings ResourcesShangluoPeople’s Republic of China
  2. 2.Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, College of Chemistry and Chemical EngineeringLiaocheng UniversityLiaochengPeople’s Republic of China

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