RT info:eu-repo/semantics/article
T1 Thermodynamics of amide + amine mixtures. 3. Relative permittivities of N , N -dimethylformamide + N -propylpropan-1-amine, + N -butylbutan-1-amine, + butan-1-amine, or + hexan-1-amine systems at several temperatures
A1 Hevia de los Mozos, Luis Fernando
A1 González López, Juan Antonio Mariano
A1 García de la Fuente, Isaías Laudelino
A1 Sanz del Soto, Luis Felipe
A1 Cobos Hernández, José Carlos
K1 Termodinámica
K1 Termodinámica
K1 DMF, Amine, Permittivity, Orientational polarizability, Kirkwood correlation factor
K1 2213 Termodinámica
AB Relative permittivities at 1 MHz, ε_r, and at (293.15-303.15) K, are reported for the binary systems N,N-dimethylformamide (DMF) + N-propylpropan-1-amine (DPA), + N-butylbutan-1-amine (DBA), + butan-1-amine (BA) or + hexan-1-amine (HxA). The values of the excess relative permittivities, ε_r^E, have also been determined for these solutions. The measurements were realized by means of a precision impedance analyser 4294A, to which a 16452A cell connected using a 16048G test lead, all of them from Agilent. The ε_r^E values are large and negative, and diminish when the size of the amine increases along a homologous series, which has been ascribed mainly to the rupture of interactions between like molecules along mixing. Calculations on excess molar orientational polarizabilities support this conclusion, indicating a dominant contribution to ε_r^E from the orientational polarizability of the molecules in the mixture. The analysis of excess relative Kirkwood correlation factors shows that the correlation between dipoles is effectively decreased along the mixing process.
PB Elsevier
SN 0167-7322
YR 2017
FD 2017
LK https://uvadoc.uva.es/handle/10324/69145
UL https://uvadoc.uva.es/handle/10324/69145
LA eng
NO Journal of Molecular Liquids, 2017, vol. 238, 440-446
DS UVaDOC
RD 24-nov-2024