Thermodynamic properties of 1,1′-biadamantane

lnpPa=(32.82±0.37)−(13126±153)KT.The sublimation enthalpy was obtained from the results of the effusion measurements: image (417.8 K) = 109.1 ± 1.3 kJ mol−1, image (298.15 K) = 113.8 ± 1.4 kJ mol−1. The complete set of fundamentals was compiled from experimental spectral data and results of calculations in terms of the density functional theory (B3LYP/6-31G*). The combustion enthalpy of C20H30, image (298.15 K, cr) = −(11801.3 ± 7.3) kJ mol−1, was determined by the bomb-calorimetry method and the enthalpy of formation, image (298.15 K, cr) = −(356.4 ± 7.8) kJ mol−1, was obtained. The thermodynamic properties of 1,1′-biadamantane in the ideal-gas state were calculated.