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Indian Journal of Advances in Chemical Science Volume: 5,
Issue: 2, April 2017 |
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ISSN No.: 2320-0898 (Print);
2320-0928 (Electronic)
DOI:
10.22607/IJACS.2017.502004
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Research Article
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Supramolecular Assembly of
Ionic Liquid with Cyclic Polyethers to Form Inclusion Complexes |
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Mitali Kundu,
Mahendra Nath Roy* |
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ABSTRACT |
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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. |
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Key words: Formation
constant, 1H nuclear magnetic resonance, Electrospray ionization
mass spectrometry, Fourier transform infrared spectroscopy. |
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[Download Full Article
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