Abstract
A novel crystalline bis(n-undecylammonium) tetrachlorozincate (C11H23NH3)2ZnCl4(s) was synthesized by liquid phase reaction. X-ray single crystal diffraction technique, chemical analysis, and elementary analysis were used to determine crystal structure and chemical composition of the complex. Lattice potential energy was calculated to be UPOT=873.05kJ·mol−1 from crystallographic data. Molar enthalpies of dissolution of the compound at different molalities in the double-distilled water were measured with an isoperibol solution-reaction calorimeter at T=298.15K. On the basis of Pitzer’s electrolyte solution theory, molar enthalpy of dissolution of (C11H23NH3)2ZnCl4(s) at infinite dilution was calculated to be ΔsHm∞=(42.67±0.340)kJ·mol−1, and sums of Pitzer parameters 4βC11H23NH3,Cl(0)L+2βZn,Cl(0)L+θC11H23NH3,ZnL and 2βC11H23NH3,Cl(1)L+βZn,Cl(1)L were obtained. In addition, the molar enthalpy of hydration of the cation [C11H23NH3]+ in the complex (C11H23NH3)2ZnCl4(s) was calculated to be ΔH+=−(25.52±0.878)kJ·mol−1 by designing a thermochemical cycle based on lattice potential energy and molar enthalpy of dissolution of the title complex at infinite dilution.
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