Specific electrical conductivity of concentrated solutions of 1-butyl-4-methylpyridinium tetrafluoroborate in dimethylformamide

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The distance between ions and molecules of ionic liquid in solution is estimated. It is found that in the concentration range of 1–2 mol/l, a maximum should be expected on the concentration dependence of specific electrical conductivity (EC), since contact ion pairs are formed in the solution. Specific EC of concentrated solutions of 1-butyl-4-methylpyridinium tetrafluoroborate in dimethylformamide was measured in the temperature range of 10–70°C, and the density of these solutions was measured in the temperature range of 10–60°C. The dependences of specific EC and density on temperature and concentration are analyzed. The density of solutions decreases linearly with increasing temperature, and specific EC passes through a maximum with increasing concentration. With an increase in temperature from 10 to 70°C, the concentration cmax corresponding to the maximum EC κmax increases from 1.258 to 1.825 mol/l. To generalize the temperature and concentration dependences of the specific EC, the normalized EC κ/κmax and normalized concentration c/cmax were used. In the coordinates κ/κmax – c/cmax, all values of the normalized EC κ/κmax fit on to a single curve. It is shown that at concentrations not exceeding ~1.0 mol/l, with increasing temperature, the specific EC κ increases in direct proportion to the limiting high-frequency electrical conductivity of the solvent κ∞. Based on the analysis of the κ – κ∞ dependencies, the solvation numbers of ionic liquid ions in dimethylformamide were determined, which decrease from 2.89 to 1.09 with an increase in concentration from ~0.1 to ~1.0 mol/l.

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Sobre autores

Yu. Artemkina

Mendeleev University of Chemical Technology of Russia

Email: shcherbakov.V.V@muctr.ru
Rússia, Moscow

V. Dzyuba

Mendeleev University of Chemical Technology of Russia

Email: shcherbakov.V.V@muctr.ru
Rússia, Moscow

U. Odinaev

Mendeleev University of Chemical Technology of Russia

Email: shcherbakov.V.V@muctr.ru
Rússia, Moscow

V. Shcherbakov

Mendeleev University of Chemical Technology of Russia

Autor responsável pela correspondência
Email: shcherbakov.V.V@muctr.ru
Rússia, Moscow

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2. Fig. 1. Dependence of the density of [BuMPy][BF₄] solutions in DMF on temperature; the concentrations of the solutions are given in Table 2.

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3. Fig. 2. Dependence of the specific EC κ of [BuMPy][BF₄] solutions in DMF on the concentration c (a) and the normalized specific EC κ/κₘₐₓ on the normalized concentration c/cₘₐₓ (b); temperature values ​​(°C) are shown on the graphs.

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4. Fig. 3. Dependence of the maximum specific EP κₘₐₓ on the corresponding concentration cₘₐₓ; temperature values ​​(°C) are shown on the graph.

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5. Fig. 4. Dependence of the specific EP of [BuMPy][BF₄] solutions in DMF on the limiting HF EP of the solvent for relatively dilute (a) and concentrated (b) solutions; the concentration values ​​(M) of the solutions (1–6, 10–17) are given in Table 1.

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