RT info:eu-repo/semantics/article
T1 Thermodynamics of mixtures with strongly negative deviations from Raoult's law. XVII. Permittivities and refractive indices for alkan-1-ol +   N,N-diethylethanamine systems at (293.15–303.15) K. Application of the Kirkwood-Fröhlich model
A1 Hevia de los Mozos, Luis Fernando
A1 González López, Juan Antonio Mariano
A1 Cobos Huerga, Ana
A1 García de la Fuente, Isaías Laudelino
A1 Sanz del Soto, Luis Felipe
K1 Termodinámica
K1 Alkan-1-ol
K1 N,N-diethylethanamine
K1 Permittivity
K1 Refractive index
K1 Kirkwood correlation factor
K1 2213 Termodinámica
K1 2210.21 Equilibrio de Fases
K1 2210.30 Soluciones
AB Relative permittivities at 1 MHz, epsilon(r), at 0.1 MPa and (293.15–303.15) K and refractive indices, nD, at similar conditions have been measured for the alkan-1-ol (methanol, propan-1-ol, butan-1-ol, pentan-1-ol or heptan-1-ol) + N,N-diethylethanamine (TEA) systems. Positive values of  the excess permittivities, epsilon(r)E, are encountered for the methanol system at high alcohol concentrations. The remaining mixtures are characterized by negative epsilon(r)E values over the whole composition range. At fi1 (volume fraction) = 0.5, epsilon(r)E changes in the order: methanol > propan-1-ol > butan-1-ol < pentan-1-ol < heptan-1-ol. Mixtures formed by alkan-1-ol and an isomeric amine, hexan-1-amine (HxA) or N-propylpropan-1-amine (DPA) or cyclohexylamine, behave similarly. This has been explained in terms of the lower and weaker self-association of longer alkan-1-ols. From the permittivity data, it is shown that: (i) (alkan-1-ol)-TEA interactions contribute positively to epsilon(r)E; (ii) TEA is an effective breaker of the network of the alkan-1-ols; (iii) structural effects, which are very important for the volumetric and calorimetric data of alkan-1-ol + TEA systems, are also relevant when evaluating dielectric data. This is confirmed by the comparison of epsilon(r)E measurements for alkan-1-ol + aliphatic amine mixtures; (iv) the aromaticity effect (i.e., the replacement of TEA by pyridine in systems with a given alkan-1-ol) leads to an increase of the mixture polarization. Calculations conducted in the framework of the Kirkwood-Fröhlich model are consistent with the previous statements.
PB Elsevier Ltd
SN 0021-9614
YR 2019
FD 2019
LK http://uvadoc.uva.es/handle/10324/38602
UL http://uvadoc.uva.es/handle/10324/38602
LA eng
NO The Journal of Chemical Thermodynamics 141 (2020) 105937
NO Producción Científica
DS UVaDOC
RD 22-nov-2024