Imidazolium camphorsulfonamides: Chiral catanionic liquid crystals with tunable thermal properties - Archive ouverte HAL
Article Dans Une Revue Journal of Colloid and Interface Science Année : 2011

Imidazolium camphorsulfonamides: Chiral catanionic liquid crystals with tunable thermal properties

Résumé

We report the synthesis of novel chiral catanionic liquid crystals bearing camphorsulfonamide substructures. The phase behaviour of these long-chain substituted imidazolium sulphates and sulfonates was investigated using X-ray diffraction (XRD), polarizing optical microscopy (POM) and differential scanning calorimetry (DSC). We observed that the phase behaviour clearly depends on the substitution of both cation and anion. The chiral camphorsulfonamide substructures have an unfavourable influence on the formation of liquid crystalline (LC-) phases. Contrary to N,N0-di-alkyl-imidazolium salts, the formation of LC phases was only observed when both cation and anion are substituted with long alkyl chains (C12 or C16). Furthermore, the phase transition temperatures depend on the chain length of the alkyl groups, as higher phase transition temperatures were observed for compounds bearing longer alkyl chains. However, no macroscopic evidence for the formation of chiral mesophases was obtained.

Domaines

Matériaux

Dates et versions

hal-00572408 , version 1 (01-03-2011)

Identifiants

Citer

Eva Rettenmeier, Alexei Tokarev, Christophe Blanc, Philippe Dieudonné, Yannick Guari, et al.. Imidazolium camphorsulfonamides: Chiral catanionic liquid crystals with tunable thermal properties. Journal of Colloid and Interface Science, 2011, 356, pp.639-646. ⟨10.1016/j.jcis.2011.01.055⟩. ⟨hal-00572408⟩
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