Thermochemistry of methoxythiophenes: Measurement of their enthalpies of vaporization and estimation of their enthalpies of formation in the condensed phase
Temprado, M.[Manuel], Notario, R.[Rafael], Roux, M. V.[MarIa Victoria], Verevkin, S. P.[Sergey P.]
Enthalpies of vaporization of 2- and 3-methoxythiophenes (48.32 +- 0.30 and 48.54 +- 0.22 kJ/mol, respectively) have been measured by the transpiration method using nitrogen as the carrying and protecting stream. Combustion experiments leading to enthalpies of formation in the liquid phase, deltafH0m(l), for both isomers failed due to rapid darkening of freshly distilled samples even under a protecting atmosphere. However, combination of experimental vaporization enthalpies with values of the gaseous enthalpies of formation, deltafH0m(g), obtained by quantum-chemical calculations from our previous work Notario et al. (2012) [24] permits establishing estimated deltafH0m(l) values of (68.3 +- 4.2) and (80.1 +- 4.2) kJ/mol, for 2- and 3-methoxythiophene, respectively.
Compounds
#
Formula
Name
1
C5H6OS
2-methoxythiophene
2
C5H6OS
3-methoxythiophene
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.