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- Title
Crystal structure and chemical thermodynamic properties of potassium d-gluconate K(d-C<sub>6</sub>H<sub>11</sub>O<sub>7</sub>)(s).
- Authors
Di, You-Ying; Zhang, Yu-Han; Liu, Yu-Pu; Kong, Yu-Xia; Zhou, Chun-Sheng
- Abstract
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 <italic>T</italic> = 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 ΔsHm∞<inline-graphic></inline-graphic> = (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<italic>L</italic>) and relative partial molar enthalpies of the solvent (L¯1<inline-graphic></inline-graphic>) and the compound (L¯2<inline-graphic></inline-graphic>) at different concentrations <italic>m</italic>/(mol kg−1) are derived from the experimental values of the enthalpies of dissolution of the compound.
- Subjects
CRYSTAL structure; THERMODYNAMICS; POTASSIUM; GLUCONATE dehydrogenase; COORDINATION compounds; LIQUID phase epitaxy; X-ray crystallography
- Publication
Journal of Thermal Analysis & Calorimetry, 2018, Vol 131, Issue 2, p1373
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-017-6657-x