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Título : Orientational effects in alkanone, alkanal or dialkyl carbonate + alkane mixtures and in alkanone + alkanone or + dialkyl carbonate systems
Autor : Hevia, Fernando
González, Juan Antonio
Alonso Tristán, Cristina
García de la Fuente, Isaías
Sanz, Luis Felipe
Publicado en: Journal of Molecular Liquids. 2017, V. 233, p. 517–527
Editorial : Elsevier
Fecha de publicación : may-2017
Fecha de disponibilidad: may-2019
Resumen : Interactions and structure of alkanone, or alkanal or dialkyl carbonate + alkane mixtures, or of 2-alkanone + 2-alkanone, or of ketone + dialkyl carbonate systems have been investigated by means of a set of thermodynamic properties and by the application of the Flory model. The properties considered are excess molar quantities: enthalpies, HmE, volumes, VmE, or isobaric heat capacities, CpmE, and liquid-liquid equilibria. Experimental data show that alkane mixtures are characterized by rather strong dipolar interactions. In the case of systems containing ketones with the same number of C atoms and a given alkane, dipolar interactions become weaker in the sequence: aromatic > cyclic > linear. In addition, the mentioned interactions become also weaker in the order: dialkyl carbonate > linear alkanone > linear alkanal. This is an important result, as carbonates show lower effective dipole moments than the other compounds, and it suggests that the group size may be relevant when evaluating thermodynamic properties of liquid mixtures. Results on HmE from the Flory model show that orientational effects (i.e., non-random mixing) are rather similar for systems with linear, cyclic or aromatic ketones or alkanals and alkanes. In contrast, orientational effects become weaker in dialkyl carbonate + alkane mixtures. The behavior of 2-alkanone + 2-alkanone systems and of mixtures of longer 2-alkanones or cyclohexanone with dialkyl carbonate is close to random mixing. Larger orientational effects are encountered in solutions of carbonates and shorter 2-alkanones.
Palabras clave: Polar compound
Steric
Cyclization
Aromaticity
Flory
Orientational effects
URI : http://hdl.handle.net/10259/4395
Versión del editor: http://dx.doi.org/10.1016/j.molliq.2017.03.014
Aparece en las colecciones: Artículos SWIFT

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