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Inorganics 2015, 3(2), 246-266; doi:10.3390/inorganics3020246

Synthesis, Characterization and Study of Liquid Crystals Based on the Ionic Association of the Keplerate Anion [Mo132O372(CH3COO)30(H2O)72]42− and Imidazolium Cations

1
Institut Lavoisier de Versailles, UMR 8180, University of Versailles, 45 avenue des Etats-Unis, Versailles 78035, France
2
Laboratoire de Chimie de Coordination Inorganique et Organométallique LCIO, Université Libanaise, Faculté des Sciences I, Hadath, Lebanon
3
Ecole Doctorale des Sciences et Technologie EDST, PRASE, Université Libanaise, Hadath, Lebanon
4
Department of Inorganic and Analytical Chemistry, University of Geneva, 30 quai E. Ansermet, Geneva CH-1211, Switzerland
*
Author to whom correspondence should be addressed.
Academic Editors: Greta Ricarda Patzke and Pierre-Emmanuel Car
Received: 21 April 2015 / Revised: 14 May 2015 / Accepted: 20 May 2015 / Published: 5 June 2015
(This article belongs to the Special Issue Polyoxometalates)
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Abstract

A series of eight new materials based on the ionic association between 1-methyl-3-alkylimidazolium cations and the nanometric anionic Keplerate [Mo132O372(CH3COO)30(H2O)72]42− has been prepared and characterized in the solid state. The liquid crystal properties of these materials were investigated by the combination of Polarized Optical Microscopy, Differential Scanning Calorimetry and Small-angle X-Ray Diffraction showing a self-organization in lamellar (L) mesophases for the major part of them. From the interlamellar spacing h and the intercluster distance ahex, we demonstrated that the cations are not randomly organized around the anionic cluster and that the alkyl chains of the cations are certainly folded, which limits the van der Waals interactions between the cations within the liquid crystal phase and therefore harms the quality of the mesophases. View Full-Text
Keywords: polyoxometalates; Keplerate; cluster; liquid crystal polyoxometalates; Keplerate; cluster; liquid crystal
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Watfa, N.; Floquet, S.; Terazzi, E.; Salomon, W.; Guénée, L.; Buchwalder, K.L.; Hijazi, A.; Naoufal, D.; Piguet, C.; Cadot, E. Synthesis, Characterization and Study of Liquid Crystals Based on the Ionic Association of the Keplerate Anion [Mo132O372(CH3COO)30(H2O)72]42− and Imidazolium Cations. Inorganics 2015, 3, 246-266.

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