Crystal structure and chemical thermodynamic properties of potassium d-gluconate K(d-C6H11O7)(s)
| Autor: | Chun-Sheng Zhou, Yu-Pu Liu, Yu-Han Zhang, Yu-Xia Kong, You-Ying Di |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Aqueous solution
Chemistry Enthalpy Inorganic chemistry Ionic bonding 02 engineering and technology Crystal structure 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Standard enthalpy of formation 010406 physical chemistry 0104 chemical sciences Enthalpy change of solution chemistry.chemical_compound Chemical thermodynamics Physical chemistry Carboxylate Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 131:1373-1383 |
| ISSN: | 1588-2926 1388-6150 |
| Popis: | An important coordination compound potassium d-gluconate K[d-C6H11O7](s) has been synthesized by liquid phase method. The chemical component and crystal structure of the important compound are characterized by chemical analysis, elemental analysis, and X-ray crystallography. Single-crystal X-ray analysis reveals that the compound exhibits the chelate property of d-gluconate anions to K+ cations, a six-membered chelate ring is formed by the coordination of K+ with O2 of carboxylate and O4 of hydroxyl in a d-gluconate, and one cation is coordinated to six d-gluconate anions. The lattice potential energy and ionic volume of the anion [d-C6H11O7]− are obtained from crystallographic data. In accordance with Hess’ law, a reasonable thermochemical cycle is designed according to the practical synthesis reaction of the compound and the standard molar enthalpy of formation of the compound is calculated to be −(1754.17 ± 0.19) kJ mol−1 as an important physical quantity in chemical thermodynamics by an isoperibol solution–reaction calorimeter. Molar enthalpies of dissolution of the compound at various molalities are measured at T = 298.15 K in the double-distilled water. According to Pitzer’s electrolyte solution theory, molar enthalpy of dissolution of the title compound at infinite dilution is calculated to be $$\Delta_{\text{s}} H_{\text{m}}^{\infty }$$ = (27.92 ± 0.21) kJ mol−1. In terms of the above value, the standard molar enthalpy of formation of the anion [d-C6H11O7]− in the aqueous solution is determined to be = −(1473.87 ± 0.28) kJ mol−1. The values of relative apparent molar enthalpies (Φ L) and relative partial molar enthalpies of the solvent ( $$\bar{L}_{1}$$ ) and the compound ( $$\bar{L}_{2}$$ ) at different concentrations m/(mol kg−1) are derived from the experimental values of the enthalpies of dissolution of the compound. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink