Unsymmetrical banana-shaped liquid crystalline compounds 1 derived from 2,7-dihydroxynaphtalene

Simion, Alecsandru; Huzum, Cosmin-Constantin; Carlescu, Irina; Lisă, Gabriela; Bălan, Mihaela; Scutaru, Dan

doi:10.2298/jsc140725126s

Cited by 2 publications

(4 citation statements)

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“…The introduction of benzyl unit to compounds 19a-19e led to compounds 23a-23e, where only the last three compounds of the series showed enantiotropic behavior [53]. It was noted that though the melting and isotropization transition temperatures were lower, considering the hydrogen bonding interaction in compounds 19a-19e, but at the same time, the mesophase domains were larger, up to 35°C in compound 23e.…”

Section: Bent-core Compounds Based On 27-dihydroxynaphtalene Corementioning

confidence: 99%

“…Changing the azo linkage in compounds 23a-23e with ester results in compounds 24a-24e, where only the first three homologous compounds, with shorter alkyl chains, presented enantiotropic behavior [53]. The presence of ester linkage increases the transition temperatures but decreases the mesophase range, if one considers compound 24c (21°C), compared with 23c (30°C).…”

Section: Bent-core Compounds Based On 27-dihydroxynaphtalene Corementioning

confidence: 99%

“…This chapter proposes to describe the relationship between the structure and supramolecular ordering properties of symmetrical and asymmetrical bent-core liquid crystals synthetized by our research group. In order to keep this chapter within a certain length, the detailed study on synthesis and complete characterization of compounds is not included here and may be found in the original papers [39][40][41][42][43][44][45][46][47][48][49][50][51][52][53]. In the following sections, the transition temperature (°C) and the type of mesophase for each compound are given below its chemical structure, while transitions in square brackets refer to monotropic phase.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Bent-core Compounds Based On 27-dihydroxynaphtalene Corementioning

confidence: 99%

Section: Bent-core Compounds Based On 27-dihydroxynaphtalene Corementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…The synthesis and mesom orphic properties of banana shaped compounds derived from 2,7-dihydroxy naphthalene have also been reported. [13][14][15][16][17] Rahman et al [18] have reported new pyrimidine-based photo-switchable bentcore liquid crystals.…”

Section: Introductionmentioning

confidence: 99%

Mesogenic Terminal Naphthyl Derivatives with Azomethine/Azo and Ester Central Linkages

Patel¹,

Prajapati²

2018

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Two new mesogenic homologous series of naphthalene with different central linkages: (E)-naphthalen-2-yl 4-(4-n-alkoxybenzylideneamino)benzoate (I) and (E)-naphthalen-2-yl 4-(4-n-alkoxyphenylazo)benzoate (II) have been synthesized and characterized by a combination of elemental analysis and standard spectroscopic methods. In series I, all the twelve synthesized compounds exhibit mesomorphism. Methoxy to n-tetradecyloxy derivatives exhibit enantiotropic nematic mesophase. The SmA mesophase commences from n-pentyloxy derivative as an enantiotropic and persists up to the n-hexadecyloxy homologue synthesized. In series II, all the twelve synthesized compounds exhibit enantiotropic nematic mesophase. SmA mesophase commences from n-heptyloxy as monotropy and persist up to the n-hexadecyloxy homologous synthesized. The mesomorphic properties of present series were compared with each other and with a structurally related mesogenic homologous series to evaluate the effects of central linkage on mesomorphism.

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Unsymmetrical banana-shaped liquid crystalline compounds 1 derived from 2,7-dihydroxynaphtalene

Cited by 2 publications

References 1 publication

Bent-Core Liquid Crystals: Structures and Mesomorphic Properties

Bent-Core Liquid Crystals: Structures and Mesomorphic Properties

Mesogenic Terminal Naphthyl Derivatives with Azomethine/Azo and Ester Central Linkages

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