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Issue 6, 2015
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Synthesis, characterization, and tuning of the liquid crystal properties of ionic materials based on the cyclic polyoxothiometalate [{Mo4O4S4(H2O)3(OH)2}2(P8W48O184)]36−

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Abstract

A series of compounds resulting from the ionic association of a nanoscopic inorganic cluster of formula [K2NaxLiy{Mo4O4S4(OH)2(H2O)3}2(HzP8W48O184)](34−xyz)−, 1, with several organic cations such as dimethyldioctadecylammonium DODA+, trimethylhexadecylammonium TMAC16+, alkylmethylimidazoliums mimCn+ (n = 12–20) and alkyl-dimethylimidazoliums dmimCn+ (n = 12 and 16) was prepared and characterized in the solid state by FT-IR, EDX, Elemental analysis, TGA and solid state NMR. The solid state NMR experiments performed on 1H, 13C and 31P nuclei evidenced the interactions between the cations and 1 as well as the organization of the alkyl chains of the cations within the solid. Polarized optical microscopy, DSC and SA-XRD experiments implicated mesomorphic phases for DODA+ and mimCn+ salts of 1. The crystallographic parameters were determined and demonstrated that the inter-lamellar spacing could be controlled upon changing the length of the alkyl chain, a very interesting result if we consider the huge size of the inorganic cluster 1 and the simple nature of the cations.

Graphical abstract: Synthesis, characterization, and tuning of the liquid crystal properties of ionic materials based on the cyclic polyoxothiometalate [{Mo4O4S4(H2O)3(OH)2}2(P8W48O184)]36−

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Supplementary files

Article information


Submitted
18 Nov 2014
Accepted
11 Dec 2014
First published
11 Dec 2014

Soft Matter, 2015,11, 1087-1099
Article type
Paper
Author version available

Synthesis, characterization, and tuning of the liquid crystal properties of ionic materials based on the cyclic polyoxothiometalate [{Mo4O4S4(H2O)3(OH)2}2(P8W48O184)]36−

N. Watfa, S. Floquet, E. Terazzi, M. Haouas, W. Salomon, V. S. Korenev, F. Taulelle, L. Guénée, A. Hijazi, D. Naoufal, C. Piguet and E. Cadot, Soft Matter, 2015, 11, 1087
DOI: 10.1039/C4SM02551B

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