Indian Journal of Advances in Chemical Science Volume: 5, Issue: 2, April 2017

 
             
   
   

ISSN No.: 2320-0898 (Print); 2320-0928 (Electronic)

DOI:  10.22607/IJACS.2017.502004

 

   

Research Article

 

      Supramolecular Assembly of Ionic Liquid with Cyclic Polyethers to Form Inclusion Complexes    
Mitali Kundu, Mahendra Nath Roy*
ABSTRACT
 
Complexation process of the selected macrocyclic crown compound such as 18‑crown‑6 (18C6) and dibenzo 18C6 (DB18C6) with 1‑ethyl‑1‑methylpyrrolidinium hexafluorophosphate [EMPyrr] PF6 as a guest molecule have been intended in acetonitrile medium at by conductometry (three different temperatures), 1H nuclear magnetic resonance (NMR) and mass spectra. The formation constants of the complexes are evaluated in solution phase from the molar conductance‑mole ratio values. The result shows that the stability of the resulting complexes with the same inward cationic moiety follows in the order 18C6: [EMPyrr]+>DB18C6:[EMPyrr]+ and based on the character of the crown ethers. The calculated thermodynamic parameters support this complexation process. The host‑guest complexations of the five‑membered nitrogen‑containing cation with two different macrocyclic polyethers are supported by studying 1H NMR. The electrospray mass spectrometry has been used to support the complexation process with the proper stoichiometry ratio. The solid complex formation between the selected two crown ethers and the ionic liquid are established by Fourier transform infrared study.
     
     

Key words:  Formation constant, 1H nuclear magnetic resonance, Electrospray ionization mass spectrometry, Fourier transform infrared spectroscopy.

 

 

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