Monofluorinated unsymmetrical bent‐core mesogens

Achten, Remko; Smits, Evelien A. W.; Reddy, R. Amaranatha; Giesbers, Marcel; Marcelis, Antonius T. M.; Sudhölter, Ernst J. R.

doi:10.1080/02678290500393131

Cited by 11 publications

(11 citation statements)

References 29 publications

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“…In contrast to most low molar mass bent-core molecules, with an antiferroelectric ground state [16,17], banana compounds with siloxane [15,[18][19][20] or carbosilane [21] groups attached, tend to show a ferroelectric organization due to a microsegregation of the three incompatible units [8]. The typical optically isotropic textures with domains of opposite handedness is often observed for bent-core molecules with siloxane segments.…”

Section: Introductionmentioning

confidence: 86%

Banana‐shaped side chain liquid crystalline siloxanes

et al. 2006

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Eight banana-shaped side chain liquid crystalline oligomers and polymers have been synthesized by hydrosilylation of vinyl-terminated bent-core mesogens with trimethylsilylterminated siloxanes. The synthesized oligomers and polymers, and their olefinic precursors, were investigated by polarizing optical microscopy (POM), differential scanning calorimetry, X-ray diffraction (XRD), electro-optical experiments and Maldi-Tof. The short-tailed olefins form a Col r mesophase, whereas those with longer chains exhibit the SmCP A mesophase. All the oligomers and polymers studied show liquid crystalline properties and do not crystallize upon cooling. Most oligomers with around four repeating siloxane units, show a lamellar (layer) structure and antiferroelectric switching properties, the SmCP A phase. XRD shows that the layer spacings are hardly influenced by the length of the terminal tails. The oligomer prepared from the smallest olefinic precursor, having the shortest alkyl tail, shows an XRD pattern reminiscent of a columnar phase, although POM displays domains of opposite chirality, and no switching behaviour could be detected. The polymers with around 35 repeating siloxane units are liquid crystalline, but due to their high viscosity a thorough characterization of the liquid crystalline phases was impossible.

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Section: Introductionmentioning

confidence: 86%

Banana‐shaped side chain liquid crystalline siloxanes

et al. 2006

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“…For the synthesis of the target compound, 4-cyanoresorcinol (1) 21 was acylated with 4-(3-fluoro-4-octyloxybenzoyloxy)benzoic acid (2), which was obtained according to the methods described in the literature. 22 For details and analytical data see ESI †.…”

Section: Synthesismentioning

confidence: 99%

Evidence of a polar cybotactic smectic A phase in a new fluorine substituted bent-core compound

et al. 2011

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“…The non-symmetry of the molecular structure was introduced, for example, by different length and type of the terminal chain (14)(15)(16)(17)(18)(19)(20)(21)(22)(23), by different functionalities in the central unit (14)(15)(16)(24)(25)(26)(27)(28)(29)(30), different number and lateral substitution of the benzene units in the arms (16,18,19,27,(29)(30)(31)(32)(33), the type, number and orientation of the linking groups (28,(34)(35)(36)(37)(38)(39)(40), and combination of all these factors. A special sub-type of non-symmetrical bent-shaped liquid crystals are the hockey-stick mesogens, denomination of which was introduced for five-ring materials with non-symmetrical position of the bend (41).…”

Section: Introductionmentioning

confidence: 99%

Novel hockey‐stick mesogens with the nematic, synclinic and anticlinic smectic C phase sequence

et al. 2008

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New hockey-stick mesogens have been synthesised and their mesomorphic properties studied. The molecular structure consists of a laterally substituted central naphthalene unit prolonged by two non-symmetrical arms, both of which contain ester units of identical orientation. The shorter arm possesses only one and the longer arm three benzene rings. Nematic, synclinic smectic C and anticlinic smectic C phases were identified and their physical properties studied. No banana-type ordering producing dipolar phases has been found.

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Monofluorinated unsymmetrical bent‐core mesogens

Cited by 11 publications

References 29 publications

Banana‐shaped side chain liquid crystalline siloxanes

Banana‐shaped side chain liquid crystalline siloxanes

Evidence of a polar cybotactic smectic A phase in a new fluorine substituted bent-core compound

Novel hockey‐stick mesogens with the nematic, synclinic and anticlinic smectic C phase sequence

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