Ferroelectric Liquid Crystals Composed of Banana-Shaped Thioesters

Wróbel, S.; Chruściel, J.; Wierzejska-Adamowicz, M.; Marzec, M.; Ossowska-Chruściel, D.M.; Legrand, Christian; Douali, R.

doi:10.5772/22155

Cited by 3 publications

(1 citation statement)

References 30 publications

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“…[19,20] Therefore, the main aim of modern liquid crystals research is designing new materials characterised by the rich polymorphism. [21,22] By introducing various linking groups [23] (like azo, Schiff bases, [24] thioester [25] and ester [26,27]), we can influence the type of the mesophase. Among the ester derivatives, the alkyl 4-[4-(alkyloxy)phenyl]diazenyl] benzoates (see Figure 1A) and 4-[4-(alkyloxy)phenyl] diazenyl]phenyl alkanoates (see Figure 1B) constitute a large group of compounds.…”

Section: Introductionmentioning

confidence: 99%

The kinetics of the E-Z-E isomerisation and liquid-crystalline properties of selected azobenzene derivatives investigated by the prism of the ester group inversion

et al. 2015

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Two new groups of azobenzene ester derivatives were synthesised: alkyl 4-[4-(nonyloxy)phenyl]diazenyl]benzoates and 4-[4-(nonyloxy)phenyl]diazenyl]phenyl alkanoates. All 35 presented homologues are mesogenic. Moreover, some of the above-mentioned compounds exhibit rich liquid-crystalline polymorphism likewise tetramorphism. During this investigation by the use of polarising optical microscopy, differential scanning calorimetry and X-Ray studies, six types of mesophases were detected: nematic, smectics (A, C, I, F) and G. Furthermore, due to the presence of the photosensitive azo moiety, the E-Z isomerisation reaction is possible. This process, which is initiated by the UV irradiation, causes significant changes in the UV-Vis absorption spectra of investigated compounds. However, the photoisomerisation is a reversible process and in the dark the thermal relaxation of Z isomer takes place. Based on the achieved data, the kinetic constants of the isomerisation and relaxation processes were calculated. It shows that conversion of the ester bond makes some changes in the optical properties. The shift of about 7 nm of the absorbance maximum was observed. Surprisingly, the inversion of the ester group has significant influence on the liquid-crystalline polymorphism replacing one mesophase (for benzoates) into four (for alkanoates).

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Section: Introductionmentioning

confidence: 99%

The kinetics of the E-Z-E isomerisation and liquid-crystalline properties of selected azobenzene derivatives investigated by the prism of the ester group inversion

et al. 2015

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Dielectric properties of liquid crystal formed by laterally fluorine-substituted banana-shaped molecules

Różański

2018

Phase Transitions

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Preparation and Aggregation-Induced Emission of New 1,3,5-Triazine-2,4,6-tricarboxamide with Liquid Crystal Properties

Umar

Shamsuddin

2018

Orient. J. Chem

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The combination of aggregation-induced emission (AIE) and liquid crystal properties generates solid-state efficient luminescent liquid crystal materials. Here in, we reported the synthesis of 1,3,5-triazine-2,4,6-tricarboxamide and utilized it as a supramolecular organic motif for the AIE-active liquid crystal material. The compound exhibits high-intensity emission maxima at 417 and 468 nm in the solid state with excitation at 254 nm, whereas it shows weak emission in the solution phase. Also, this compound behaves as liquid crystalline material and shows columnar hexagonal mesophase with endothermic peaks at 73.4oC, 185.6oC, and exothermic peaks were observed at 181.9oC and 66.1oC with focal conic fan shape texture. The thermal data showed that the compound is stable up to 200oC.

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Ferroelectric Liquid Crystals Composed of Banana-Shaped Thioesters

Cited by 3 publications

References 30 publications

The kinetics of the E-Z-E isomerisation and liquid-crystalline properties of selected azobenzene derivatives investigated by the prism of the ester group inversion

The kinetics of the E-Z-E isomerisation and liquid-crystalline properties of selected azobenzene derivatives investigated by the prism of the ester group inversion

Dielectric properties of liquid crystal formed by laterally fluorine-substituted banana-shaped molecules

Preparation and Aggregation-Induced Emission of New 1,3,5-Triazine-2,4,6-tricarboxamide with Liquid Crystal Properties

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