The cubic mesophase of analogous chiral and achiral hydrazine derivatives

Göring, Petra; Diele, Siegmar; Fischer, Sean A.; Wiegeleben, A.; Pelzl, G.; Stegemeyer, H.; Thyen, W.

doi:10.1080/026782998205976

Cited by 46 publications

(20 citation statements)

References 26 publications

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“…26 A hydrazine derivative, 1,2-bis(4-n-octyloxybenzoyl)hydrazine, exhibits a cubic phase with Ia3d on both heating and cooling and it was pointed out that the formation of nuclei of the cubic structure in the preceding phase would be important for the appearance of the phase. 61 These dependences of cubic formation on the thermal cycle, not seen for lyotropic liquid crystalline systems, may be characteristic of thermotropic liquid crystalline systems, especially one-chain systems with a long aliphatic chain at each terminal.…”

Section: Discussionmentioning

confidence: 99%

Phase Transitions of 4‘-n-Hexacosyloxy-3‘-nitrobiphenyl-4-carboxylic Acid (ANBC-26): Two Types of Thermotropic Cubic Phases

et al. 2000

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The phase transitions of 4′-n-hexacosyloxy-3′-nitrobiphenyl-4-carboxylic acid (ANBC-26, where "26" indicates the number of carbon atoms in the alkoxy group) were investigated by differential scanning calorimetric (DSC), polarizing optical microscopic, and X-ray diffraction (XRD) measurements. ANBC-26 is a new liquid crystalline material which exhibits successively two types of three-dimensionally ordered cubic mesophases on heating; the low-temperature cubic (CubI) phase has a space group of Im3m, and the high-temperature one (CubII phase) is of Ia3d type, identical with the cubic phase of shorter alkoxy chain homologues such as ANBC-16, and a cubic-cubic phase transition occurs at 435 K on DSC. Reversibility of the transitions between them was studied and the structures of those mesophases are discussed. The transformation from a onedimensionally ordered smectic C (SmC) to the CubI phase and to the CubII phase can be interpreted qualitatively in terms of the increased curvature of the interface. The structured liquid I 1 phase, an intermediate phase between the CubII and a true isotropic liquid I 2 phases, has been also studied, indicating that this phase could be characterized by Ornstein-Zernike type short-range fluctuation, which means the presence of molecular clusters consisting of several ANBC-26 dimers in the temperature region.

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Section: Discussionmentioning

confidence: 99%

Phase Transitions of 4‘-n-Hexacosyloxy-3‘-nitrobiphenyl-4-carboxylic Acid (ANBC-26): Two Types of Thermotropic Cubic Phases

et al. 2000

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“…10.38 for the chemical structure) [97,98]. We found that locally oriented aggregates of molecular bundles exist.…”

Section: Nanostructured Liquid Crystalline Phasementioning

confidence: 76%

Physics of Liquid Crystals

Tabe

Urayama

Matsuyama³

et al. 2014

The Liquid Crystal Display Story

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“…Such a structure has been realized in a coassembly of niobia nanoparticles with a triblock poly(isoprene-b-styrene-b-ethylene oxide) copolymer [146]. Using a hydrazine derivative, Goering et al [147] reported the first cubic liquid crystal phase in a chiral mesogen that displayed chirality in optical measurement. While a similar but achiral hydrazine derivative showed the bicontinuous Ia3d phase (a = 6.5 nm), for the chiral cubic phase space group I432 was proposed (a = 9.6 nm) even though other symmetries such as I23, I2 1 3, and I4 1 32 could not be ruled out.…”

Section: Chiral Cubic and Smectic-q Phasesmentioning

confidence: 99%