A systematic study of a series of room-temperature ionic liquids, belonging to the alkylammonium nitrate family (XAN), was carried out at 298.15 K and 0.1 MPa with the aim of investigating the effect of the cationic chain length on some thermo-physical properties and their behavior in the organic solvent N-methyl-2-pyrrolidone (NMP), over the whole concentration range. Experimental densities were used to calculate molar volumes, V-m, and excess molar volumes, V-E. Complementary information was obtained by isothermal titration calorimetry that provided the values of the heat of mixing, H-E, and the excess partial molar enthalpies of each component, (H) over bar (E)(1) and (H) over bar (E)(2). The density values of neat XAN samples decreased as the alkyl chain length of the cation increases, whereas, the addition of the methoxy group to the considered smaller alkyl chain resulted in an increase of density. Negative V-E and H-E values were found for each XAN + NMP system, indicating the presence of strong attracting interactions between the constituents. (C) 2014 Elsevier B.V. All rights reserved.

Usula, M., Matteoli, E., Leonelli, F., Mocci, F., Marincola, F.c., Gontrani, L., et al. (2014). Thermo-physical properties of ammonium-based ionic liquid + N-methyl-2-pyrrolidone mixtures at 298.15K. FLUID PHASE EQUILIBRIA, 383, 49-54 [10.1016/j.fluid.2014.09.031].

Thermo-physical properties of ammonium-based ionic liquid + N-methyl-2-pyrrolidone mixtures at 298.15K

Gontrani, L.
Investigation
;
2014-01-01

Abstract

A systematic study of a series of room-temperature ionic liquids, belonging to the alkylammonium nitrate family (XAN), was carried out at 298.15 K and 0.1 MPa with the aim of investigating the effect of the cationic chain length on some thermo-physical properties and their behavior in the organic solvent N-methyl-2-pyrrolidone (NMP), over the whole concentration range. Experimental densities were used to calculate molar volumes, V-m, and excess molar volumes, V-E. Complementary information was obtained by isothermal titration calorimetry that provided the values of the heat of mixing, H-E, and the excess partial molar enthalpies of each component, (H) over bar (E)(1) and (H) over bar (E)(2). The density values of neat XAN samples decreased as the alkyl chain length of the cation increases, whereas, the addition of the methoxy group to the considered smaller alkyl chain resulted in an increase of density. Negative V-E and H-E values were found for each XAN + NMP system, indicating the presence of strong attracting interactions between the constituents. (C) 2014 Elsevier B.V. All rights reserved.
2014
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore CHIM/02 - CHIMICA FISICA
English
Con Impact Factor ISI
Ionic liquid
N-methyl-2-pyrrolidone
Density
Molar excess volume
Molar excess enthalpy
Usula, M., Matteoli, E., Leonelli, F., Mocci, F., Marincola, F.c., Gontrani, L., et al. (2014). Thermo-physical properties of ammonium-based ionic liquid + N-methyl-2-pyrrolidone mixtures at 298.15K. FLUID PHASE EQUILIBRIA, 383, 49-54 [10.1016/j.fluid.2014.09.031].
Usula, M; Matteoli, E; Leonelli, F; Mocci, F; Marincola, Fc; Gontrani, L; Porcedda, S
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/294555
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