Enthalpies of combustion and formation of the 1-alkanethiols. The methylene increment to the enthalpy of formation. [Hexane-, heptane-, and decanethiol]
The enthalpies of combustion of 1-hexanethiol, 1-heptanethiol, and 1-decanethiol were measured by the rotating-bomb method. Enthalpies of formation of these compounds in the liquid state were derived. Values of the enthalpies of vaporization of 1-hexanethiol and 1-heptanethiol were derived from vapor pressure measurements of this laboratory. The enthalpy of vaporization of 1-decanethiol was estimated. The following values, in kilocalories mole/sup -1/, are reported for the standard enthalpy of formation, ..delta..H line integral/sup 0//sub 298.15/, of these compounds in the gaseous state from graphite, rhombic sulfur, and gaseous hydrogen: 1-hexanethiol, -30.90 +- 0.23; 1-heptanethiol, -35.73 +- 0.23; and 1-decanethiol, -50.65 +- 0.35. These values of enthalpy of formation were combined with earlier enthalpy-of-formation studies of methanethiol, ethanethiol, 1-propanethiol, 1-butanethiol, and 1-pentanethiol to compute values of the methylene increments to the enthalpy of formation of the 1-alkanethiols. These methylene increments were compared to those for the n-paraffin hydrocarbons.
- Research Organization:
- Bureau of Mines, Bartlesville, OK
- OSTI ID:
- 7098530
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 70:11
- Country of Publication:
- United States
- Language:
- English
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