Thermochemistry of germanium monoselenide, and the GeSe bond dissociation enthalpy☆

Abstract The standard molar enthalpy of formation Δ f H m o of GeSe(cr) has been determined by fluorine-combustion calorimetry to be −(51.4±1.5) kJ·mol −1 at T = 298.15 K and p o = 101.325 kPa. Combination of this result with auxiliary enthalpies of formation and sublimation from the literature gave the bond-dissociation enthalpy D m o (GeSe) = (485±4) kJ·mol −1 at T →0 for the reaction: GeSe(g, 1 ∑ + ) = Ge(g, 3 P 0 ) + Se(g, 3 P 2 ) . Dissociation enthalpies of the other germanium chalcogenides are also discussed. Thermodynamic quantities for GeSe(cr) from 298.15 to 800 K have been calculated and tabulated.