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−
| Autor: | Nancy Watfa, Francis Taulelle, Daoud Naoufal, Sébastien Floquet, Vladimir S. Korenev, William Salomon, Claude Piguet, Emmanuel Terazzi, Akram Hijazi, Mohamed Haouas, Emmanuel Cadot, Laure Guénée |
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| Rok vydání: | 2015 |
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| Zdroj: | Soft Matter, Vol. 11, No 6 (2015) pp. 1087-1099 |
| ISSN: | 1744-6848 1744-683X |
| DOI: | 10.1039/c4sm02551b |
| Popis: | 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−x−y−z)−, 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. |
| Databáze: | OpenAIRE |
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