Novel chiral calamitic liquid crystalline oxadiazoles as ferroelectric materials

Parra, M.; Hidalgo, Paulina I.; Soto‐Bustamante, Eduardo; Barberá, Joaquín; Elgueta, Elizabeth; Trujillo‐Rojo, V. H.

doi:10.1080/02678290802513790

Cited by 27 publications

(3 citation statements)

References 50 publications

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“…Ever since the phenomenon of ferroelectricity in a chiral smectic C mesophase was observed in 1975, ferroelectric liquid crystals have attracted continuous attention owing to their potential applications in new technologies. Aer some initial research in chiral liquid crystalline 1,3,4-oxadiazoles, 29 Parra's group successfully obtained a chiral liquid crystalline 1,3,4-oxadiazole 20 (Scheme 10), 30 which exhibited enantiotropic chiral nematic (N*) and smectic C (SmC*) mesophases with wide temperature ranges, and a monotropic blue phase with a narrow temperature range. This was the rst example of a calamitic liquid crystalline 1,3,4-oxadiazole exhibiting ferroelectric properties with a large spontaneous polarization and a fast switching time (in the range of tens of milliseconds).…”

Section: Chiral Liquid Crystalsmentioning

confidence: 99%

1,3,4-Oxadiazole based liquid crystals

Han

2013

J. Mater. Chem. C

117

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Section: Chiral Liquid Crystalsmentioning

confidence: 99%

1,3,4-Oxadiazole based liquid crystals

Han

2013

J. Mater. Chem. C

117

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“…In spite of having similar structure, compounds based on 2,5‐diphenyl‐1,2,4‐oxadiazole units are not much explored either in the area of liquid crystals or in the area of OLEDs in comparison to substituted 1,3,4‐oxadiazole derivatives . Asymmetrical nature of 2,5‐diphenyl‐1,2,4‐oxadiazole derivatives provide a strong lateral dipole, which stabilizes different LC phases in comparison to their 1,3,4‐oxadiazole isomer . In addition, the bent angle is 141° which is more than that of 1,3,4‐oxadiazole derivative (bent angle of 134°), which in turn provides a much linear structure, thus helping in the mesophase stabilization.…”

Section: Introductionmentioning

confidence: 99%

Hexacatenars Exhibiting π-π Driven Supergelation, Aggregation Induced Blue Light Emission and Thermochromism

et al. 2016

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Two series of five ring polycatenars, which vary from each other with respect to the position of connection to the central benzene ring are reported. The overall shape of the molecule plays a major role than the number of flexible tails in the periphery in dictating the self-assembly (liquid crystallinity and gelation) and the photophysical behavior. Tetracatenars were crystalline and meta-substituted compounds exhibited reduced tendency to stabilize the mesophase. In the para-substituted series, all the hexacatenars exhibited columar hexagonal phase. p-Sub-stituted hexacatenar with n-dodecyloxy tails exhibited thermochromism, with the highly emissive Col h phase and non-emissive soft crystal phase. Three p-substituted compounds exhibited supergelation exclusively promoted by p-p interactions. Besides the capability to form self-standing, moldable gel, one of the compounds exhibited technologically important aggregation-induced blue light emission. The columnar order and emissive nature in the aggregated state makes these molecules promising for the application in emissive displays.

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“…Liquid crystalline polymers are widely studied because of their application in electronic and optical devices. 85 Liquid crystalline polymers, bearing photo-active chromophores, are important for the development of polymer-based smart materials, 106 reversible and irreversible information storage media, 107,108 holographic applications 109 and liquid crystalline display devices. 110 A range of polymers, bearing the BBCA moiety, were synthesized with backbone architectural variations and characterized for their liquid crystalline (LC) and other properties.…”

Section: Bisbenzylidene Polymers 1 Photoactive Liquid Crystalline Pol...mentioning

confidence: 99%

Bisbenzylidene cycloalkanone: a versatile molecule as a polymer building block

Murali

Samui

2010

J. Mater. Chem.

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Bisbenzylidene cycloalkanone [BBCA], a versatile photo-active molecule, has already shown its potential for applications in biology, chemistry, materials science and technology. The molecule possesses the dual nature of a photo-active molecule and a mesogenic unit. It was studied as such for medical applications and by incorporating it into polymer architectures for harnessing its properties as a photo-active as well as a mesogenic unit. It was incorporated into almost all kinds of polymer architectures from polyester to polyimide. The special features of the polymer bearing this unit are high thermal stability, photo-curing ability (for adhesives, photo-resists, holography), electronic conductivity, fluorescence, etc. Even during the past decades progress was made mostly in the methods of synthesis and structural understanding of these polymers, the functional understanding and application of these polymers are still in their infancy. Quite recently, bisbenzylidene cycloalkanone polymers (linear and hyperbranched) have been reported by our group. The hyperbranched polymers address some problems regarding the solubility and quick photo-response of bisbenzylidene polymers. We discuss the state-of-the-art of this multi-disciplinary BBCA molecule and BBCA containing polymers reported to date. We believe this article will be very useful as the progress in science and technology concerning this molecule is rather slow. Our aim is to bring together details of the work reported so-far and its significance that will be useful to the scientific community.

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Novel chiral calamitic liquid crystalline oxadiazoles as ferroelectric materials

Cited by 27 publications

References 50 publications

1,3,4-Oxadiazole based liquid crystals

1,3,4-Oxadiazole based liquid crystals

Hexacatenars Exhibiting π-π Driven Supergelation, Aggregation Induced Blue Light Emission and Thermochromism

Bisbenzylidene cycloalkanone: a versatile molecule as a polymer building block

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