High-Accuracy Vapor Pressure Data of the Extended [C(n)C(1)im][Ntf(2)] Ionic Liquid Series: Trend Changes and Structural Shifts

• Tipo: Artigo em Revista Científica Internacional
• Data: 2011

Autores

Marisa A A Rocha (Autor) Outra; Carlos F R A C Lima (Autor) Outra; Ligia R Gomes (Autor) Outra; Bernd Schroeder (Autor) Outra; Joao A P Coutinho (Autor) Outra; Isabel M Marrucho (Autor) Outra; Jose M S S Esperanca (Autor) Outra; Luis P N Rebelo (Autor) Outra; Karina Shimizu (Autor) Outra; Jose N C Canongia Lopes (Autor) Outra; Luis M N B F Santos (Autor) FCUP

Revista

Título: Journal of Physical Chemistry B

Vol. 115 Nº 24

Páginas: 10919-10926

ISSN: 1520-6106

Editora: American Chemical Society

Indexação

ISI Web of Knowledge - 188 Citações

Scopus - 198 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-002-MGE

DOI: 10.1021/jp2049316

Abstract (EN): For the first time, two distinct trends are clearly evidenced for the enthalpies and entropies of vaporization along the [C(n)mim][Ntf(2)] ILs series. The trend shifts observed for Delta H-g(1)m degrees and Delta S-g(1)m degrees, which occur at [C(6)mim] [Ntf(2)], are related to structural modifications. The thermodynamic results reported in the present article constitute the first quantitative experimental evidence of the structural percolation phenomenon and make a significant contribution to better understanding of the relationship among cohesive energies, volatilities, and liquid structures of ionic liquids. A new Knudsen effusion apparatus, combined with a quartz crystal microbalance, was used for the high-accuracy volatility study of the 1-alkyl-3-methylirnidazolium bis(trifluoromethylsulfonyl)imide series ([C(n)mim][Ntf(2)], where n = 2, 3, 4, 5, 6, 7, 8, 10, 12). Vapor pressures in the (450-500) K temperature range were measured, and the molar standard enthalpies, entropies, and Gibbs energies of vaporization were derived. The thermodynamic parameters of vaporization were reported, along with molecular dynamic simulations of the liquid phase structure, allowing the establishment of a link between the thermodynamic properties and the percolation phenomenon in ILs.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8