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Host–guest interactions between 4-sulfonatocalix[8]arene and 1-alkyl-3-methylimidazolium type ionic liquids
- Source :
- Thermochimica Acta. 548:76-80
- Publication Year :
- 2012
- Publisher :
- Elsevier BV, 2012.
-
Abstract
- The inclusion of 1-alkyl-3-methylimidazolium ions (C n mim + ) in 4-sulfonatocalix[8]arene was studied by isothermal titration calorimetry in aqueous solution at 298 K. Sequential formation of 1:1 and 2:1 complexes occurred in enthalpy driven reactions. The alteration of the molecular structure of the guest barely affected the driving force of the confinement of the first C n mim + . However, the binding affinity of the second C n mim + went through a maximum when the number of carbon atoms in the side chain was increased. The enthalpy and entropy change diminished linearly with the length of the aliphatic substituent of C n mim + for 1:1 complexation, but reached a minimum for the hexyl homologue in the case of 2:1 inclusion. Linear entropy–enthalpy correlations were found with smaller slope and intercept for the second binding step.
Details
- ISSN :
- 00406031
- Volume :
- 548
- Database :
- OpenAIRE
- Journal :
- Thermochimica Acta
- Accession number :
- edsair.doi...........647df9e444e24416b096adc34ef1ca87