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Thermochemistry of methoxythiophenes: Measurement of their enthalpies of vaporization and estimation of their enthalpies of formation in the condensed phase

AutorTemprado, M.; Notario, Rafael ; Roux, María Victoria ; Verevkin, Sergey P.
Fecha de publicación2014
EditorAcademic Press
CitaciónJournal of Chemical Thermodynamics 73: 97- 100 (2014)
ResumenEnthalpies of vaporization of 2- and 3-methoxythiophenes (48.32 ± 0.30 and 48.54 ± 0.22 kJ · mol-1, 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, ΔfH0 m(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, ΔfH0 m(g), obtained by quantum-chemical calculations from our previous work Notario et al. (2012) [24] permits establishing estimated ΔfH0 m(l) values of -(68.3 ± 4.2) and -(80.1 ± 4.2) kJ · mol-1, for 2- and 3-methoxythiophene, respectively. © 2014 Elsevier Ltd. All rights reserved.
URIhttp://hdl.handle.net/10261/167915
Identificadoresdoi: 10.1016/j.jct.2013.11.003
issn: 1096-3626
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