Molecular Interactions in 1-Ethyl-3-Methylimidazolim Tetrafluoroborate?+?Amide Mixtures: Excess Molar Volumes, Excess Isentropic Compressibilities and Excess Molar Enthalpies
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- 作者：V. K. Sharma (1)
Soniya Bhagour (1) - 关键词：Excess molar volumes V E ; Excess molar enthalpies H E ; Excess isentropic compressibilities $$ \kappa_{S}^{\text{E}} $$ κ S E ; Connectivity parameter of third degree of a molecule 3 ξ ; Interaction parameter χ
- 刊名：Journal of Solution Chemistry
- 出版年：2013
- 出版时间：May 2013
- 年：2013
- 卷：42
- 期：4
- 页码：800-822
- 全文大小：728KB
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Soniya Bhagour (1)
1. Department of Chemistry, M. D. University, Rohtak, 124001, India - ISSN：1572-8927
文摘
The densities, ρ 12sub>, and speeds of sound, u 12sub>, 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}} $ H 12 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}} $ V 12 E , and excess isentropic compressibility, $ \left( {\kappa_{S}^{\text{E}} } \right)_{12} $ ( κ S E ) 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}} $ V 12 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 –CH3sub> 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}} $ V 12 E , $ H_{12}^{\text{E}} $ H 12 E and $ \left( {\kappa_{S}^{\text{E}} } \right)_{12} $ ( κ S E ) 12 values determined from Graph theory compare well with their measured experimental data.