Chemical Thermodynamics and Thermal Analysis (Mar 2022)
Crystal structure and solution thermodynamics of the lactate complex Zn[(C3H5O3)2(H2O)2]⋅H2O(s)
Abstract
An important trihydrated lactate complex Zn[(C3H5O3)2(H2O)2]⋅H2O(s) was synthesized. Crystal structure was characterized by X-ray single crystal diffractometer, and molecular structure, spatial structure and coordination mode of the complex were determined. The lattice potential energy of the complex was calculated by crystal data. The enthalpy of dissolution of the compound in the water was measured by isoperibol reaction calorimeter with an accuracy of ±0.3%. According to the Pitzer electrolyte solution theory, molar enthalpy of dissolution at the infinite dilution and Pitzer parameters of the compound soluble in water at T = 298.15 K were calculated. Combined with molar enthalpy of dissolution in the infinite dilution (ΔsHm∞) and lattice potential energy (UPOT), enthalpy of hydration of lactate ion was calculated. Mechanism of thermal analysis or dehydration of the compound was explained by TG-DSC technique.
