Journal of Chemical & Engineering Data
278.15 to 363.15) K. The density and dynamic viscosity of the
Article
(
(12) Azevedo, R. G. D.; Esperanca
̧
, J. M. S. S.; Szydlowski, J.; Visak,
Z. P.; Pires, P. F.; Guedes, H. J. R.; Rebelo, L. P. N. Thermophysical
and thermodynamic properties of ionic liquids over an extended
pressure range: [bmim][NTf ] and [hmim][NTf ]. J. Chem.
samples decrease with the increase in temperature; however,
the conductivity behaves inversely. The dynamic viscosity
increases with the extension of the alkyl side chain of the cation,
while the density and electrical conductivity have an opposite
trend. The molar volume increment per the addition of two
2
2
Thermodyn. 2005, 37, 888−899.
(
13) Crosthwaite, J. M.; Muldoon, M. J.; Dixon, J. K.; Anderson, J. L;
Brennecke, J. F. Phase transition and decomposition temperatures,
heat capacities and viscosity of pyridinium ionic liquids. J. Chem.
Thermodyn. 2005, 37, 559−568.
(14) Gardas, R. L.; Costa, H. F.; Freire, M. G.; Carvalho, P. J.;
Marrucho, I. M.; Fonseca, I. M. A.; Ferreira, A. G. M.; Coutinho, J. A.
P. Densities and derived thermodynamic properties of imidazolium-,
pyridinium-, pyrrolidinium-, and piperidinium-based ionic liquids. J.
Chem. Eng. Data 2008, 53, 805−811.
15) Oliveira, F. S.; Freire, M. G.; Carvalho, P. J.; Coutinho, J. A. P.;
Lopes, J. N. C.; Rebelo, L. P. N.; Marrucho, I. M. Structural and
positional isomerism influence in the physical properties of pyridinium
NTf -based ionic liquids: pure and water-saturated mixtures. J. Chem.
3
−1
carbon atoms, 33.7 cm ·mol , is obtained at 298.15 K. The
melting temperatures of the two ILs are below 295 K. The
samples exhibited excellent thermal stability up to 630 K. The
VFT equation can be used to fit the dynamic viscosity and
electrical conductivity of ILs. The ILs [C 4mpy][NTf ] (n = 2,
n
2
4) are “subionic”.
(
ASSOCIATED CONTENT
■
*
S
Supporting Information
NMR, DSC, and TG curves of [C 4mpy][NTf ] (n = 2, 4) and
2
n
2
Eng. Data 2010, 55, 4514−4520.
(
16) Yunus, N. M.; Mutalib, M. I. A.; Man, Z.; Bustam, M. A.;
Murugesan, T. Thermophysical properties of 1-alkylpyridinium
bis(trifluoromethylsulfonyl)imide ionic liquids. J. Chem. Thermodyn.
2010, 42, 491−495.
AUTHOR INFORMATION
■
(
17) Liu, Q. S.; Yang, M.; Yan, P. F.; Liu, X. M.; Tan, Z. C.; Welz-
J.C.).
Biermann, U. Density and surface tension of ionic liquids [C py]-
n
*
[
NTf ] (n = 2, 4, 5). J. Chem. Eng. Data 2010, 55, 4928−4930.
2
(
(
18) Liu, Q. S.; Yang, M.; Li, P. P.; Sun, S. S.; Welz-Biermann, U.;
Tan, Z. C.; Zhang, Q. G. Physicochemical Properties of Ionic Liquids
[C py][NTf ] and [C py][NTf ]. J. Chem. Eng. Data 2011, 56, 4094−
101.
19) Liu, Q. S.; Yan, P. F.; Yang, M.; Tan, Z. C.; Li, C. P.; Welz-
Funding
This work was financially supported by the National Nature
Science Foundation of China under Grant: NSFC No.
3
2
6
2
4
(
21203193, 50973013, and 21273029.
Biermann, U. Dynamic viscosity and conductivity of ILs [C py][NTf ]
n = 2, 4, 5). Acta Phys. Chim. Sin. 2011, 27 (12), 2762−2766.
(20) Tong, B.; Liu, Q. S.; Tan, Z. C.; Welz-Biermann, U.
n
2
Notes
(
The authors declare no competing financial interest.
Thermochemistry of alkyl pyridinium bromide ionic liquids:
Calorimetric measurements and calculations. J. Phys. Chem. A 2010,
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