Banana-shaped 1,2,4-oxadiazoles

Torgova, S. I.; Geivandova, T. A.; Francescangeli, O.; Strigazzi, Alfredo

doi:10.1007/bf02708306

Cited by 52 publications

(31 citation statements)

References 20 publications

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“…Even molecules with a chemical structure very similar to that of the compounds studied by Kumar and Samulski do not have a N b phase but display other interesting properties, like the formation of nematic phases with cybotactic clusters [41] stable over a quite wide range of temperatures.…”

Section: Methodsmentioning

confidence: 98%

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Computer simulations of biaxial nematics

Berardi

Muccioli

Orlandi

et al. 2008

J. Phys.: Condens. Matter

120

108

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Abstract. Biaxial nematic (N b ) liquid crystals are a fascinating condensed matter phase that has baffled for more than thirty years scientists engaged in the challenge of demonstrating its actual existence, and which has only recently been experimentally found. During this period computer simulations of model N b have played an important role, both in providing the basic physical properties to be expected from these systems, and in giving clues about the molecular features essential for the thermodynamic stability of N b phases. However, simulations studies are expected to be even more crucial in the future for unravelling the structural features of biaxial mesogens at molecular level, and for helping in the design and optimisation of devices towards the technological deployment of N b materials. This review article gives an overview of the simulation work performed so far, and relying on the recent experimental findings, focusses on the still unanswered questions which will determine the future challenges in the field.

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Section: Methodsmentioning

confidence: 98%

“…Theories for the elastic [76,77,78,79,80,81,82,83,41], flexoelectric [84,85], and rheological [86] behaviour of N b have also been proposed. However, computer simulations of the associated mesoscopic coefficients (e.g.…”

Section: Order Parameters and Theoriesmentioning

confidence: 99%

Computer simulations of biaxial nematics

Berardi

Muccioli

Orlandi

et al. 2008

J. Phys.: Condens. Matter

120

108

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“…Here we focus on a system composed of asymmetric 3,5-bis-{4-[4-(n-nonyloxy)benzoyloxy]phenyl}-1,2,4-oxadiazoles (9BPO), [22] presenting both tilted SmC and N phases [23,24] extending over a very wide temperature range (Scheme 1), for which preliminary experiments suggested the presence of polar ordering. [23] …”

Section: Introductionmentioning

confidence: 99%

Ferroelectric Response and Induced Biaxiality in the Nematic Phase of Bent‐Core Mesogens

Francescangeli

Stanić

Torgova

et al. 2009

Adv Funct Materials

194

170

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The still undiscovered fluid ferroelectric nematic phase is expected to exhibit a much faster and easier response to an external electric field compared to conventional ferroelectric smectic liquid crystals; therefore, the discovery of such a phase could open new avenues in electro‐optic device technology. Here, experimental evidence of a ferroelectric response to a switching electric field in a low molar mass nematic liquid crystal is reported and connected with field‐induced biaxiality. The fluid is made of bent‐core polar molecules and is nematic over a range of 120 °C. Combining repolarization current measurements, electro‐optical characterizations, X‐ray diffraction and computer simulations, ferroelectric switching is demonstrated and it is concluded that the response is due to field‐induced reorganization of polar cybotactic groups within the nematic phase. This work represents significant progress toward the realization of ferroelectric fluids that can be aligned at command with a simple electric field.

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“…In Ref. 12, several asymmetric heterocyclic structures are proposed, leading to molecules with bend-shape and mesogenic properties ( Figure 5). The 1,2,4-oxadiazole compounds display distinct aspects such as an asymmetrical distribution of electronic density, giving a dipole moment of ≈ 1.5 D. A distortion of the linearity of the molecule due to the bonding angles is observed and then the authors named the compounds as bananashaped 1,2,4-oxadiazoles.…”

Section: The 35-disubstituted-124 Oxadiazoles With Bend-shapementioning

confidence: 99%

Some Features of Liquid Crystalline Oxadiazoles

Sparavigna¹

2013

ijSciences

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Abstract:We propose a survey of some features of those oxadiazole compounds which are mesogenic, that is, which are displaying liquid crystalline properties induced by their rod-or disk-like molecules. We will see that they can have bend-shaped molecules too, creating biaxial phases, and other interesting peculiarities in the nematic and smectic phases. With large electric dipoles and luminescent properties, these materials are also very appealing for technological applications.

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Banana-shaped 1,2,4-oxadiazoles

Cited by 52 publications

References 20 publications

Computer simulations of biaxial nematics

Computer simulations of biaxial nematics

Ferroelectric Response and Induced Biaxiality in the Nematic Phase of Bent‐Core Mesogens

Some Features of Liquid Crystalline Oxadiazoles

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