NDLI: Studies on thermochemical properties of ionic liquids based on transition metal

Content Provider	Springer Nature Link
Author	Guan, W. Li, L. Wang, H. Tong, J. Yang, J. Z.
Copyright Year	2008
Abstract	A brown and transparent ionic liquid (IL), [C$_{4}$mim][FeCl$_{4}$], was prepared by mixing anhydrous FeCl$_{3}$ with 1-butyl-3-methylimidazolium chloride ([C$_{4}$mim][Cl]), with molar ratio 1/1 under stirring in a glove box filled with dry argon. The molar enthalpies of solution, Δ$_{s}$ H $_{m}$, of [C$_{4}$mim][FeCl$_{4}$], in water with various molalities were determined by a solution-reaction isoperibol calorimeter at 298.15 K. Considering the hydrolyzation of anion [FeCl$_{4}$]$^{−}$ in dissolution process of the IL, a new method of determining the standard molar enthalpy of solution, Δ$_{s}$ H m 0 , was put forward on the bases of Pitzer solution theory of mixed electrolytes. The values of Δ$_{s}$ H m 0 and the sum of Pitzer parameters: $$ (4\beta _{Fe,Cl}^{(0)L} + 4\beta _{C_4 mim,Cl}^{(0)L} + \Phi _{Fe,C_4 mim}^L ) $$ and $$ (\beta _{Fe,Cl}^{(1)L} + \beta _{C_4 mim,Cl}^{(1)L} ) $$ were obtained, respectively. In terms of thermodynamic cycle and the lattice energy of IL calculated by Glasser’s lattice energy theory of ILs, the dissociation enthalpy of anion [FeCl$_{4}$]$^{−}$, ΔH $_{dis}$≈5650 kJ mol$^{−1}$, for the reaction: [FeCl$_{4}$]$^{−}$(g)→Fe$^{3+}$(g)+4Cl$^{−}$(g), was estimated. It is shown that large hydration enthalpies of ions have been compensated by large the dissociation enthalpy of [FeCl$_{4}$]$^{−}$ anion, Δ$_{d}$ H $_{m}$, in dissolution process of the IL.
Starting Page	507
Ending Page	510
Page Count	4
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	94
Issue Number	2
e-ISSN	15728943
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-09-19
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	enthalpy of solution ionic liquid isoperibol calorimeter Pitzer’s theory Measurement Science, Instrumentation Inorganic Chemistry Polymer Sciences Analytical Chemistry Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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