http://www.cnr.it/ontology/cnr/individuo/prodotto/ID283498

Vaporization of the prototypical ionic liquid BMImNTf(2) under equilibrium conditions: a multitechnique study (Articolo in rivista)

Type

Articolo in rivista (Classe)
Prodotto della ricerca (Classe)

Label

Vaporization of the prototypical ionic liquid BMImNTf(2) under equilibrium conditions: a multitechnique study (Articolo in rivista) (literal)

Anno

2014-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1039/c4cp01673d (literal)

Alternative label

B. Brunetti; A. Ciccioli; G. Gigli, A. Lapi, N. Misceo, L. Tanzi, S. Vecchio Ciprioti (2014)
Vaporization of the prototypical ionic liquid BMImNTf(2) under equilibrium conditions: a multitechnique study
in PCCP. Physical chemistry chemical physics (Print)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

B. Brunetti; A. Ciccioli; G. Gigli, A. Lapi, N. Misceo, L. Tanzi, S. Vecchio Ciprioti (literal)

Pagina inizio

15653 (literal)

Pagina fine

15661 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

16 (literal)

Rivista

PCCP. Physical chemistry chemical physics (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

9 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

29 (literal)

Note

ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

ISMN- (CNR); c/o Dipartimento di Chimica Sapienza University Rome; ; IMC-CNR; Sezione Meccanismi di Reazione c/o Dipartimento di Chimca, Sapienza University Rome Dipartimento di Chimica, Sapienza -University of Rome Dipartimento di Scienze Fisiche e Chimiche, University of Aquila; Dipartimento S.B.A.I.- Sapienza Università di Roma (literal)

Titolo

Vaporization of the prototypical ionic liquid BMImNTf(2) under equilibrium conditions: a multitechnique study (literal)

Abstract

The vaporization behaviour and thermodynamics of the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethyl) sulfonylimide (BMImNTf(2)) were studied by combining the Knudsen Effusion Mass Loss (KEML) and Knudsen Effusion Mass Spectrometry (KEMS) techniques. KEML studies were carried out in a large temperature range (398-567) K by using effusion orifices with 0.3, 1, and 3 mm diameters. The vapor pressures so measured revealed no kinetically hindered vaporization effects and provided second-law vaporization enthalpies at the mean experimental temperatures in close agreement with literature. By exploiting the large temperature range covered, the heat capacity change associated with vaporization was estimated, resulting in a value of -66.8 J K-1 mol(-1), much lower than that predicted from calorimetric measurements on the liquid phase and theoretical calculations on the gas phase. The conversion of the high temperature vaporization enthalpy to 298 K was discussed and the value Delta H-g(l)m(298 K) = (128.6 +/- 1.3) kJ mol(-1) assessed on the basis of data from literature and present work. Vapor pressure data were also processed by the third-law procedure using different estimations for the auxiliary thermal functions, and a Delta H-g(l)m(298 K) consistent with the assessed value was obtained, although the overall agreement is sensitive to the accuracy of heat capacity data. KEMS measurements were carried out in the lower temperature range (393-467) K and showed that the largely prevailing ion species is BMIm(+), supporting the common view of BMImNTf(2) vaporizing as individual, neutral ion pairs also under equilibrium conditions. By monitoring the mass spectrometric signal of this ion as a function of temperature, a second-law Delta H-g(l)m(298 K) of 129.4 +/- 7.3 kJ mol(-1) was obtained, well consistent with KEML and literature results. Finally, by combining KEML and KEMS measurements, the electron impact ionization cross section of BMIm(+) was estimated. (literal)

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