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The Enthalpy of Solution of the Alanine-Based Ionic Liquid [C4mim][Ala]

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Abstract

The molar enthalpies of solution of an alanine-based ionic liquid (IL) [C4mim][Ala], 1-butyl-3-methylimidazolium alanine, containing various amount of water and various molalities Δsol H m(wc), were measured with a solution-reaction isoperibol calorimeter at (298.15±0.01) K, where wc denotes water content. According to Archer’s method, the standard molar enthalpies of solution of [C4mim][Ala] containing known amounts of water, \(\Delta_{\mathrm{sol}}H_{\mathrm{m}}^{\mathrm{o}}(\mathrm{wc})\) , were obtained. In order to eliminate the effect of the small amount of residual water in the source [C4mim][Ala], a linear fitting of \(\Delta_{\mathrm{sol}}H_{\mathrm{m}}^{\mathrm{o}}(\mathrm{wc})\) against water content was carried out, yielding a good straight line where the intercept is the standard molar enthalpy of solution of anhydrous [C4mim][Ala], \(\Delta_{\mathrm{sol}}H_{\mathrm{m}}^{\mathrm{o}}(\mathrm{pure}\ \mathrm{IL})=-(61.42\pm 0.08)\) kJ⋅mol−1. The hydration enthalpy of the alanine anion [Ala]− was estimated using Glasser’s lattice energy theory.

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Authors and Affiliations

  1. Key Laboratory of Green Synthesis and Preparative Chemistry of Advanced Materials, Liaoning University, Shenyang, 110036, P.R. China

    Wei Guan & Wei-Feng Xue

  2. College of Chemistry, Liaoning University, Shenyang, 110036, P.R. China

    Wei Guan, Jing Tong, Cai-Xia Wang & Jia-Zhen Yang

Authors
  1. Wei Guan
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  2. Wei-Feng Xue
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  3. Jing Tong
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  4. Cai-Xia Wang
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  5. Jia-Zhen Yang
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Correspondence to Jia-Zhen Yang.

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Guan, W., Xue, WF., Tong, J. et al. The Enthalpy of Solution of the Alanine-Based Ionic Liquid [C4mim][Ala]. J Solution Chem 38, 1463–1469 (2009). https://doi.org/10.1007/s10953-009-9458-4

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  • DOI: https://doi.org/10.1007/s10953-009-9458-4

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