Crystal structure and thermochemical properties of bis(1-octylammonium) tetrachlorocuprate

Abstract

Bis(1-octylammonium) tetrachlorocuprate (1-C₈H₁₇NH₃)₂CuCl₄(s) was synthesized by the method of liquid phase reaction. The crystal structure of the compound has been determined by X-ray crystallography. The lattice potential energy was obtained from the crystallographic data. Molar enthalpies of dissolution of (1-C₈H₁₇NH₃)₂CuCl₄(s) at various molalities were measured at 298.15 K in the double-distilled water by means of an isoperibol solution-reaction calorimeter, respectively. In terms of Pitzer’s electrolyte solution theory, the molar enthalpy of dissolution of (1-C₈H₁₇NH₃)₂CuCl₄(s) at infinite dilution was determined to be $\Updelta_{\rm s} H_{\text{m}}^{\infty } = \, - 5. 9 7 2\,{\text{kJ}}\,{\text{mol}}^{ - 1} ,$ and the sums of Pitzer’s parameters $(4\beta_{{{\text{C}}_{ 8} {\text{H}}_{ 1 7} {\text{NH}}_{ 3} , {\text{Cl}}}}^{ ( 0 )L} + 2\beta_{\text{Cu,Cl}}^{ ( 0 )L} + \theta_{{{\text{C}}_{ 8} {\text{H}}_{ 1 7} {\text{NH}}_{ 3} , {\text{Cu}}}}^{L} )$ and $(2\beta_{{{\text{C}}_{ 8} {\text{H}}_{ 1 7} {\text{NH}}_{ 3} , {\text{Cl}}}}^{ ( 1 )L} + \beta_{\text{Cu,Cl}}^{ ( 1 )L} )$ were obtained.