Tipo
Artigos em Revista
Tipo de Documento
Artigo Completo
Título
Structure–property relationships in protic ionic liquids: a thermochemical study
Participantes na publicação
Joshua E. S. J. Reid (Author)
Filipe Agapito (Author)
Carlos E. S. Bernardes (Author)
Dep. Química e Bioquímica
Dep. Química e Bioquímica
CQB
Filomena Martins (Author)
Dep. Química e Bioquímica
CQB
Adam J. Walker (Author)
Seishi Shimizu (Author)
Manuel E. Minas da Piedade (Author)
Dep. Química e Bioquímica
CQB
Resumo
How does cation functionality influence the strength of intermolecular interactions in protic ionic liquids (PILs)? Quantifying the energetics of PILs can be an invaluable tool to answer this fundamental question. With this in view, we have determined the standard molar enthalpy of vaporization, delta vap Hºm, and the standard molar enthalpy of formation, delta f Hºm, of three tertiary ammonium acetate PILs with varying cation functionality, and of their corresponding precursor amines, through a combination of Calvet-drop microcalorimetry, solution calorimetry, and ab initio calculations. The obtained results suggest that these PILs vaporize as their neutral acid and base precursors. We also found a strong correlation between delta vap Hºm of the PILs and of their corresponding amines. This suggests that, within this series of PILs, the influence of cation modification on their cohesive energies follows a group additivity rule. Finally, no correlation between the delta vap Hºm of PILs and the extent of proton transfer, as estimated from the difference in aqueous pKa between the precursor acid and the conjugate acid of the precursor base, was observed
Data de Submissão/Pedido
2017-04-06
Data de Aceitação
2017-07-10
Data de Publicação
2017-07-10
Instituição
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA
Suporte
Physical Chemistry Chemical Physics
Identificadores da Publicação
ISSN - 1463-9076
Editora
Royal Society of Chemistry (RSC)
Número de Páginas
9
Página Inicial
19928
Página Final
19936
Identificadores do Documento
DOI -
https://doi.org/10.1039/c7cp02230a
URL -
http://dx.doi.org/10.1039/c7cp02230a
Identificadores de Qualidade
SCOPUS Q1 (2017) - 1.686 - Physical and Theoretical Chemistry
Web Of Science Q2 (2017) - 3.906 - CHEMISTRY, PHYSICAL - SCIE
Web Of Science Q1 (2017) - 3.906 - PHYSICS, ATOMIC, MOLECULAR & CHEMICAL - SCIE
SCIMAGO Q1 (2017) - 1.686 - Physical and Theoretical Chemistry