Add time:07/31/2019         Source:sciencedirect.com

The heat capacity of 2-methyl-3-buten-2-ol over the interval T = (5 to 370) K was measured in an adiabatic calorimeter. The standard entropy and heat capacity of the liquid phase at a reference temperature 298.15 K were found to be Som = (232.6 ± 1.0) J · K−1 · mol−1 and Cs,m = (237.4 ± 0.9) J · K−1 · mol−1. The triple-point temperature Tfus = (245.03 ± 0.03) K and the corresponding enthalpy of fusion ΔcrlHom = (5.199 ± 0.012) kJ · mol−1 were also determined. The enthalpy of vaporisation was determined with a Calvet-type calorimeter to be ΔlgHmo(305.1K) = (46.9 ± 1.6) kJ · mol−1. The vapour pressure over the temperature interval (280 to 328) K was measured with a static technique. The standard entropy of vaporisation at T = 298.15 K was found to be ΔlgSom = (132.7 ± 0.2) J · K−1 · mol−1. The standard enthalpy of combustion for liquid 2-methyl-3-buten-2-ol ΔcHmo(l, 298.15 K) = −(3145.1 ± 2.7) kJ · mol−1 was measured with two static-bomb isoperibol combustion calorimeters. From the experimental data, the standard enthalpies of formation for liquid and gaseous 2-methyl-3-buten-2-ol were found to be ΔfHom(l, 298.15 K) = −(251.6 ± 2.8) kJ · mol−1 and ΔfHom (g, 298.15 K) = −(203.3 ± 2.8) kJ · mol−1, respectively. The latter value was confirmed by high-level quantum chemical calculations. Molecular association in the gas phase and its effect on thermodynamic properties of the compound were discussed.

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