Crystal structure and thermochemical properties of 1-decylammonium hydrochloride (C10H21NH3Cl)(s)

The compound 1-decylammonium hydrochloride was synthesized by the method of liquid phase reflux. Chemical analysis, elemental analysis, and X-ray crystallography were applied to characterise its composition and structure. The lattice potential energy of the crystalline solid compound was calculated from data of the crystal structure. The values of the molar enthalpy of dissolution of 1-decylammonium hydrochloride at different concentrations (m) at T = 298.15 K were measured by means of an isoperibol solution–reaction calorimeter. According to the Pitzer electrolyte solution theory, the molar solution enthalpy of C10H21NH3Cl(s) at infinite dilution (ΔsHm∞) and Pitzer parameters (βMX(0)L and βMX(1)L) were obtained. Then the apparent relative molar enthalpy (ΦL  ) of the title compound and relative partial molar enthalpies of solvent and solute (L¯1 and L¯2) were calculated, respectively. Hydration heats of the solid compound and its cation were derived from the molar solution enthalpy of the title compound at infinite dilution (ΔsHm∞) and the lattice potential energy.

Research highlights
► The lattice potential energy of 1-decylammonium hydrochloride was reported.
► The volume and radii of the cation were obtained.
► The molar solution enthalpy of C10H21NH3Cl(s) at infinite dilution were determined.
► Pitzer’s parameters of 1-decylammonium hydrochloride were derived.