Chemical thermodynamic properties for 1-alkanethiols

• Published in: The Journal of chemical thermodynamics 1970, Vol.2 (1), p.27-41
• Main Authors: Finke, H.L, McCullough, J.P, Messerly, J.F, Guthrie, G.B, Douslin, D.R
• Format: Article
• Language: English
• ISSN: 0021-9614; 1096-3626
• DOI: 10.1016/0021-9614(70)90061-3

The thermodynamic quantities (G s - H 0 o ) T , (H s - H 0 o ) T , H s - H 0 o, S s, and C s were evaluated for the solid and liquid states of ethanethiol, 1-pentanethiol, 1-hexanethiol, 1-heptanethiol, and 1-decanethiol in the range 10 to 370 K. The molar entropies S o were evaluated for the ideal gas states at 298.15 K of 1-pentanethiol, 1-hexanethiol, 1-heptanethiol, and 1-decanethiol. Values for heat capacity, enthalpy of fusion, triple point temperature, and purity were determined by adiabatic calorimetric measurements. The experimentally determined average entropy increments per methylene group at 298.15 K in liquid and ideal gas states, 7.78 and 9.30 cal K −1 mol −1, respectively, are very likely constant for alkanethiols above 1-pentanethiol, and the increments agree satisfactorily with those for n-alkanes, alkyl-sustituted cyclopentanes, and alkyl-substituted cyclohexanes.