Laterally substituted symmetric and nonsymmetric salicylideneimine-based bent-core mesogens

Findeisen-Tandel, Sonja; Weißflog, W.; Baumeister, Ute; Pelzl, G.; Murthy, H. N. Shreenivasa; Yelamaggad, C. V.

doi:10.3762/bjoc.8.15

Cited by 18 publications

(4 citation statements)

References 56 publications

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“…The synthetic route to the investigated compounds is presented in Schemes 1 and 2. Compounds 4-8 were prepared according to procedures from the literature [31][32][33][34][35]. Because their characterisation © data are in agreement with those previously reported, experimental details are not included here.…”

Section: Methodsmentioning

confidence: 99%

Mesomorphism of novel stilbene-based bent-core liquid crystals

et al. 2020

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A series of asymmetric bent-core liquid crystals, bearing the stilbene moiety in the side wing, was synthesised © and characterised © . Structural modifications of the non-stilbene wing resulted in formation of various mesophases. Compounds 1 and 3 with an ester linking group between the phenyl rings in this wing have an enantiotropic non-polar smectic-type mesophase, while compound 2, incorporating the biphenyl moiety, has a ferroelectric SmC a P F phase. The molecules of 2 undergo photoisomerisation © in solution under UV irradiation, while the mesophases are unstable and UV irradiation leads to irreversible changes. The mesophases of 1 and 3 do not show any electro-optical switching and polarisation © current. Applying low frequency AC voltage on a planarly aligned film of compound 2, smectic domains grow, while the birefringence and an image flickering increase. The observed features of these compounds identify stilbene as an attractive moiety in the design of advanced materials based on bent-core molecules.

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Section: Methodsmentioning

confidence: 99%

Mesomorphism of novel stilbene-based bent-core liquid crystals

et al. 2020

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“…There melting Liquid Crystals 1143 points above 100°C and highly ordered smectic phases were observed. [12,28] The lateral chains which have been introduced in 1 and 2 prevent efficient packing of the aromatic groups in a smectic register and thus promote the formation of a nematic phase at relatively low temperatures. [6] Quite surprising is the small temperature difference in the isotropisation temperatures of compounds 1 and 2, being only 4°C, even though a decyloxy chain has been added in 2, when compared to 1.…”

Section: Investigation Of Mesomorphic Propertiesmentioning

confidence: 99%

Mononuclear Cu(II) complexes of novel salicylidene Schiff bases: synthesis and mesogenic properties

et al. 2015

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Two new Schiff base ligands 1 and 2 (where 1 = 4-(2-hydroxybenzilidenamino)-phenyl-4-(decyloxy)-2-(pent-4-enyloxy)benzoate, 2 = 4-(4-(decyloxy)-2-hydroxybenziliden amino)-phenyl-4-(decyloxy)-2-(pent-4-enyloxy)benzoate) and their copper (Cu)(II) complexes have been synthesised and characterised. The derivatives were fully characterised structurally, and their mesomorphic behaviour was investigated by polarised optical microscopyand differential scanning calorimetry. The structure of Cu(II) complex having 1 as ligand (3) was determined by X-ray diffraction. The Schiff base ligands exhibit enantiotropic nematic phases, the Cu(II) complex 4 shows monotropic nematic phase behaviour, while compound 3 does not show mesomorphism.

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“…The liquid crystalline properties may completely disappear after the introduction of bulky lateral substituents. Sometimes, interesting modifications have been observed in the switching behavior after the introduction of small polar substituents [9,31,[33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Bent-Core Liquid Crystals: Structures and Mesomorphic Properties

Scutaru¹,

Carlescu²,

Bulai³

et al. 2019

Liquid Crystals - Self-Organized Soft Functional Materials for Advanced Applications

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Bent-core (BC) molecules became an attractive liquid crystal class due to their potential use in smart displays and photonic devices. In contrast to calamitic mesogens, bent-shaped mesogens are self-organized superstructures with remarkable properties, given the presence of polar order in mesophases, although the molecules themselves are not chiral. A particular interest represents the biaxial nematic liquid crystal materials that are used in display technology and allow a faster switching response, compared to calamitic liquid crystals, with considerably reduced costs. This chapter briefly reviews the bent-core liquid crystals with three different core units in the structure: (1) 2,5-disubstituted oxadiazole, (2) 1,3disubstituted benzene, and (3) 2,7-disubstituted naphthalene. To the central bent units (BUs) containing reactive functional groups of phenolic or aminic type, various mesogenic groups are symmetrically or asymmetrically connected, via esterification or condensation reactions. The obtained compounds showed biaxial nematic and/or smectic mesophases with high transition temperatures in the case of oxadiazole derivatives or cholesteric and banana-type mesophases with lower transition temperatures in the case of benzene and naphthalene derivatives.

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Laterally substituted symmetric and nonsymmetric salicylideneimine-based bent-core mesogens

Cited by 18 publications

References 56 publications

Mesomorphism of novel stilbene-based bent-core liquid crystals

Mesomorphism of novel stilbene-based bent-core liquid crystals

Mononuclear Cu(II) complexes of novel salicylidene Schiff bases: synthesis and mesogenic properties

Bent-Core Liquid Crystals: Structures and Mesomorphic Properties

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