Fluorination effects on the thermodynamic, thermophysical and surface properties of ionic liquids


This paper reports the thermal, thermodynamic, thermophysical and surface properties of eight ionic liquids with fluorinated alkyl side chain lengths equal or greater than four carbon atoms. Melting and decomposition temperatures were determined together with experimental densities, surface tensions, refractive indices, dynamic viscosities and ionic conductivities in a temperature interval ranging from (293.15 to 353.15) K. The surface properties of these fluorinated ionic liquids were discussed and several thermodynamic functions, as well as critical temperatures, were estimated. Coefficients of isobaric thermal expansion, molecular volumes and free volume effects were calculated from experimental values of density and refractive index and compared with previous data. Finally, Walden plots were used to evaluate the ionicity of the investigated ionic liquids. (C) 2016 Elsevier Ltd. All rights reserved.



subject category

Thermodynamics; Chemistry


Vieira, NSM; Luis, A; Reis, PM; Carvalho, PJ; Lopes-da-Silva, JA; Esperanca, JMSS; Araujo, JMM; Rebelo, LPN; Freire, MG; Pereiro, AB

our authors


The authors wish to thank M. M. Pineiro from University of Vigo for his contribution to this work and Fundacao para a Ciencia e a Tecnologia (FCT/MCTES - Ministerio da Ciencia, Tecnologia e Ensino Superior, Portugal) for financial support through Grants SFRH/BD/100563/2014 and SFRH/BPD/82264/2011, (N.S.M.V. and P.J.C), contracts under Investigator FCT 2014 (A.B.P. and J.M.M.A.) and 2012 (J.M.S.S.E), and through projects PTDC/EQU-FTT/118800/2010, PTDC/CTM-NAN/121274/2010, IF/00210/2014/CP1244/CT0003, UID/Multi/04551/2013 and UID/CTM/50011/2013. M.G. Freire acknowledges the European Research Council (ERC) for the Starting Grant ERC-2013-StG-337753. The NMR spectrometers are part of The National NMR Facility, supported by FCT/MEC (RECI/BBB-BQB/0230/2012).

Share this project:

Related Publications

We use cookies for marketing activities and to offer you a better experience. By clicking “Accept Cookies” you agree with our cookie policy. Read about how we use cookies by clicking "Privacy and Cookie Policy".