Excess molar enthalpies for [Bmmim][BF4] + [Bmim][BF4] or [Emim][BF4] + cyclopentanone or cyclohexanone mixtures

  • Heena Gupta
  • Sunita Malik
  • Vinod Kumar SharmaEmail author


In recent years, studies on mixtures consisting of ionic liquids and organic solvents have gained importance for the application of such mixtures for new chemical processes and technologies in industries. In this contribution, new experimental excess molar enthalpies, \( H_{\text{ijk}}^{\text{E}} \) data of ternary 1-butyl-2,3-dimethylimidazolium tetrafluoroborate, [Bmmim][BF4] (i) + 1-butyl-3-methylimidazolium tetrafluoroborate, [Bmim][BF4] or 1-ethyl-3-methylimidazolium tetrafluoroborate, [Emim][BF4] (j) + cyclopentanone (CPO) or cyclohexanone (CHO) (k) mixtures, have been reported over the whole composition range at 298.15 K and atmospheric pressure. The observed data have been satisfactorily correlated by Redlich–Kister equation for each mixture. The \( H_{\text{ijk}}^{\text{E}} \) values for [Bmmim][BF4] (i) + [Bmim][BF4] or [Emim][BF4] (j) + CPO (k) mixtures are positive over whole range of composition of xi and xj. The sign and magnitude of \( H_{\text{ijk}}^{\text{E}} \) values for [Bmmim][BF4] (i) + [Bmim][BF4] or [Emim][BF4] (j) + CHO (k) mixtures vary with the change in composition of the components of the mixtures. The \( H_{\text{ijk}}^{\text{E}} \) data have also been analyzed in terms of graph theory (which involves the topology of the molecule). It has been observed that estimated values by graph theory compare well with their corresponding experimental values.


Excess molar enthalpies Graph theory Connectivity parameters of third degree Interaction parameters Ionic liquids 



The authors are thankful to Mr. K. Chandrasekhar Reddy, Sri Sai Baba National College, Anantapur, Andhra Pradesh, for providing Gaussian-09 facility and Centre for Development of Advanced Computing (C-DAC), Pune, India, for providing the computational work. V. K. Sharma is grateful to University Grant Commission (UGC), New Delhi, for the award of Special Assistance Programme (SAP).


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  • Heena Gupta
    • 1
  • Sunita Malik
    • 1
  • Vinod Kumar Sharma
    • 1
    Email author
  1. 1.Department of ChemistryMaharshi Dayanand UniversityRohtakIndia

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