Issue 1, 2008
From the journal:

CrystEngComm

Crown-ether enclosure generated by ionic liquid components—synthesis, crystal structure and Raman spectra of compounds of imidazolium based salts and 18-crown-6†

Mimoza Gjikaj,*a   Wolfgang Brockner,a   Jan Namyslob  and  Arnold Adama  

* Corresponding authors

a Institute of Inorganic and Analytical Chemistry, Clausthal University of Technology, Clausthal-Zellerfeld, Germany
E-mail: mimoza.gjikaj@tu-clausthal.de
Fax: +49 5323 722995
Tel: +49 5323 722887

b Institute of Organic Chemistry, Clausthal University of Technology, Clausthal-Zellerfeld, Germany

Abstract

Bis(1,3-dimethylimidazolium methylsulfate) [18-crown-6] (1), ([DMIm]2[CH3SO4]2[18-crown-6], bis(1-butyl-3-methylimidazolium methylsulfate) [18-crown-6] (2), ([BMIm]2[CH3SO4]2[18-crown-6]), bis(1-ethyl-3-methylimidazolium methanesulfonate) [18-crown-6] (3), ([EMIm]2 [CH3SO3]2[18-crown-6]) and bis(1-ethyl-3-methylimidazolium trifluoromethanesulfonate) [18-crown-6] (4), ([EMIm]2[CF3SO3]2[18-crown-6]) were prepared and characterized by single-crystal X-ray diffraction, NMR and Raman spectroscopy. Coulomb interactions between the ionic (liquid) components as well as hydrogen bonding are important. No significant close contacts are observed between the ionic components and the 18-crown-6 molecules. Crystal structures of all compounds consist of alternated layers of crown-ether molecules and respective ionic units compounds. Within the layers of the ionic components (compounds 1, 3 and 4), two cations are linked to each other by C–H⋯π interactions between one methyl carbon and the imidazolium ring of another cation.

Graphical abstract: Crown-ether enclosure generated by ionic liquid components—synthesis, crystal structure and Raman spectra of compounds of imidazolium based salts and 18-crown-6

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Article information

DOI
https://doi.org/10.1039/B708724C
Article type
Paper
Submitted
08 Jun 2007
Accepted
30 Aug 2007
First published
17 Sep 2007

CrystEngComm, 2008,10, 103-110

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Crown-ether enclosure generated by ionic liquid components—synthesis, crystal structure and Raman spectra of compounds of imidazolium based salts and 18-crown-6

M. Gjikaj, W. Brockner, J. Namyslo and A. Adam, CrystEngComm, 2008, 10, 103 DOI: 10.1039/B708724C

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