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Molecular Interactions in 1-Ethyl-3-Methylimidazolim Tetrafluoroborate + Amide Mixtures: Excess Molar Volumes, Excess Isentropic Compressibilities and Excess Molar Enthalpies

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Abstract

The densities, ρ 12, and speeds of sound, u 12, of 1-ethyl-3-methylimidazolium tetrafluoroborate (1) + N-methylformamide or N,N-dimethylformamide (2) binary mixtures at (293.15. 298.15. 303.15, 308.15 K), and excess molar enthalpies, \( H_{12}^{\text{E}} \), of the same mixtures at 298.15 K have been measured over the entire mole fraction range using a density and sound analyzer (Anton Paar DSA-5000) and a 2-drop microcalorimeter, respectively. Excess molar volume, \( V_{12}^{\text{E}} \), and excess isentropic compressibility, \( \left( {\kappa_{S}^{\text{E}} } \right)_{12} \), values have been calculated by utilizing the measured density and speed of sound data. The observed data have been analyzed in terms of: (i) Graph theory and (ii) the Prigogine–Flory–Patterson theory. Analysis of the \( V_{12}^{\text{E}} \) data in terms of Graph theory suggest that: (i) in pure 1-ethyl-3-methylimidazolium tetrafluoroborate, the tetrafluoroborate anion is positioned over the imidazoliun ring and there are interactions between the hydrogen atom of (C–H{edge}) and proton of the –CH3 group (imidazolium ring) with fluorine atoms of tetrafluoroborate anion, and (ii) (1 + 2) mixtures are characterized by ion–dipole interactions to form a 1:1 molecular complex. Further, the \( V_{12}^{\text{E}} \), \( H_{12}^{\text{E}} \) and \( \left( {\kappa_{S}^{\text{E}} } \right)_{12} \) values determined from Graph theory compare well with their measured experimental data.

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Acknowledgments

Soniya is grateful to University Grants Commission (UGC), New Delhi, for the award of Project Fellow. The authors are also grateful to the Head of Chemistry Department and authorities of M. D. University, Rohtak, for providing research facilities.

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  1. Department of Chemistry, M. D. University, Rohtak, 124001, India

    V. K. Sharma & Soniya Bhagour

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Sharma, V.K., Bhagour, S. Molecular Interactions in 1-Ethyl-3-Methylimidazolim Tetrafluoroborate + Amide Mixtures: Excess Molar Volumes, Excess Isentropic Compressibilities and Excess Molar Enthalpies. J Solution Chem 42, 800–822 (2013). https://doi.org/10.1007/s10953-013-9991-z

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