Thermodynamic Properties of Dichloroborane

Abstract

The disproportionation reaction for $HBCl_{2}, 6HBCl_{2} \\leftrightarrow 4BCl_{3}+B_{2}H_{6}$, was followed spectrophotometrically in the infrared region and an equilibrium constant $(K_{p} (298^{\\circ}K)=532 \\pm 15 atm^{-1})$ was obtained. Statistical-thermodynamic functions were computed from fundamental frequencies and molecular constants of $HBCl_{2}$. Experimental results and statistical calculations were combined and the change of zero-point energy, $\\Delta E^{0}_{0}$, was calculated to be -18.74 kcal/mole. The molar free energy and heat of formation at $298^{\\circ}K$ for $HBCl_{2}$ were calculated to be -56.68 and -60.22 kcal, respectively.