Topological investigations of binary mixtures containing 1-ethyl-3-methylimidazolium tetrafluoroborate and anilines

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• 作者：V.K. Sharma ; ^{v_sharmachem58@rediffmail.com} ; Subhash Solanki
• 关键词：Excess molar volume ; VE ; Excess molar enthalpy ; HE ; Excess isentropic compressibility ; ¦ÊSE ; 1-Ethyl-3-methylimidazolium tetrafluoroborate ; Anilines ; Connectivity parameter of third degree ; 3¦Î
• 刊名：Journal of Molecular Liquids
• 出版年：2013
• 出版时间：January, 2013
• 年：2013
• 卷：177
• 期：Complete
• 页码：133-144
• 全文大小：1167 K

文摘

The densities, ¦Ñ, speeds of sound, u of 1-ethyl-3-methylimidazolium tetrafluoroborate (i) + aniline or N-methylaniline or 2-methylaniline (j) binary mixtures at 293.15, 298.15, 303.15, and 308.15 K and excess molar enthalpies, H^E of the same mixtures at 298.15 K have been measured over entire mole fraction using DSA-5000 and 2-Drop microcalorimeter respectively. Excess molar volumes, V^E and excess isentropic compressibilities, ¦Ê_S^E values have been predicted by utilizing the measured densities and speeds of sound data. The Graph theory which deals with the topology of the constituents of mixtures has been applied to predict (i) state of components of ionic liquid mixture in their pure and mixed state; (ii) nature and extent of interactions existing in mixtures; and (iii) V^E, H^E and ¦Ê_S^E values. The analysis of V^E data in terms of Graph theory suggests that while 1-ethyl-3-methylimidazolium tetrafluoroborate is characterized by electrostatic forces of attraction and exists as monomer; aniline or N-methylaniline or 2-methylaniline exists as associated molecular entities. Further, (i + j) mixtures are characterized by interactions between nitrogen and fluorine atoms of 1-ethyl-3-methylimidazolium tetrafluoroborate with nitrogen and hydrogen atoms of aniline or N-methylaniline or 2-methylaniline to form 1:1 molecular complex. The IR studies also support this view point. The V^E, H^E and ¦Ê_S^E values predicted by Graph theory compare well with the experimental values.