Substitution Effects on the Liquid Crystalline Properties of Thermotropic Liquid Crystals Containing Schiff Base Chalcone Linkages

Thaker, B. T.; Patel, Pranay; Vansadiya, A. D.; Kanojiya, J. B.

doi:10.1080/15421400903291533

Cited by 40 publications

(18 citation statements)

References 41 publications

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“…Molecular structure of organic compounds and their liquid crystalline properties are closely related. Table 4 summarizes the transition temperatures, mesomorphic behavior, and molecular structures of 2b and structurally related compounds reported in the literature [13,14,16,19].…”

Section: Structure-mesomorphic Propertymentioning

confidence: 99%

“…However, many years ago Chudgar and Shah [12] and Yeap et al [13] have reported homologous series containing ester-chalcone linkages. Recently, Thaker et al [14] have also synthesized mesomorphic compounds containing Schiff base-chalcone linkage. In our previous works, we have studied liquid crystals with a Schiff base central linkage and terminal halogen group [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Phase Transition Behaviours of New Chalcone Derivatives

Low

2013

Journal of Chemistry

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A series of new chalcone derivatives with a general formula of C11H27COOC6H4COCH=CHC6H4X where X=F, Cl, Br, and NO2were well synthesized and crystallized from organic solution. The physical properties as well as the chemical formulations of these compounds were determined by spectroscopic techniques (FTIR, and1H and13C NMR). Differential scanning calorimetry (DSC) and polarizing optical microscopy (POM) techniques were employed to study their transition temperatures and mesophase characteristics. DSC thermograms of compounds with fluoro and nitro substituents displayed direct isotropization and recrystallization during heating and cooling processes. Chloro and bromo analogues exhibited Cr1-to-Cr2transition within the crystal phase region. It was also found that enone linkage showed fewer tendencies to exhibit mesomorphic property compared to imine linkage. However, when enone linkage is combined with other central linkages and additional phenyl rings, it turns conducive to mesomorphism.

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Section: Structure-mesomorphic Propertymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and Phase Transition Behaviours of New Chalcone Derivatives

Low

2013

Journal of Chemistry

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“…Many years ago, Chudgar and Shah [15] and Yeap et al [16] reported a homologous series of mesogenic compounds containing ester-chalcone linkages. Recently, Thaker et al [17] also synthesized mesomorphic compounds containing a Schiff base-chalcone linkage. The emergent scientific interest in the synthesis of heterocyclic liquid crystals and the outstanding liquid crystalline behaviour of chalcone-containing compounds has prompted us to synthesize a series of mixed pyridyl-chalcone liquid crystals.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and mesomorphic properties of new heterocyclic liquid crystals with Central Ester–Chalcone linkages

Lim

Yeap

et al. 2017

Journal of Taibah University for Science

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A series of new calamitic liquid crystals, 4-[3-(pyridin-4-yl)prop-2-enoyl]phenyl 4-alkyloxybenzoates, comprising a pyridyl core, ester-chalcone central linkage and terminal alkyloxy chain were synthesized and characterized. This series consists of four members that differ by the length of the alkyloxy chain (C n H 2n+1 O , where n = 10, 12, 14, 16). The structures of the title compounds were elucidated using spectroscopic and spectrometric techniques, such as FT-IR, NMR (1 H and 13 C) and EI-MS. The mesomorphic properties were studied using differential scanning calorimetry and optical polarizing microscopy. The decyloxy-containing compound was found to be non-mesogenic, whilst the compounds containing n-dodecyloxy to n-hexadecyloxy chains exhibited an enantiotropic smectic A phase with a fan-shaped texture. From the structure-property relationship study, it was proposed that the number of carbons in the alkyloxy chain must be at least 12 (n ≥ 12) to generate the smectic phase in the corresponding substituted ArCOOArCOCH CHC 5 H 4 N compounds.

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“…These systems usually present a number of mesophases, which differ by degree of randomness of the molecular motion. The determination of molecular structure is the simplest application of molecular modeling because the structural features influence the properties of materials at the molecular level [2]. The nematic phase is the simplest of liquid crystal states, in which atoms are distributed uniformly within the molecule.…”

Section: Introductionmentioning

confidence: 99%

Molecular Structure and Conformational Behavior of a Nematogen—A Statistical Approach

Praveen¹,

Ojha²

2011

Molecular Crystals and Liquid Crystals

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Molecular structure and conformational behavior of a nematogen p-ethoxy salicylidene-n-butyl aniline (ESBA) has been studied with respect to translational and orientational motions. The atomic net charge and dipole moment components at each atomic center have been evaluated using the complete neglect differential overlap (CNDO=2) method. The modified Rayleigh-Schrodinger perturbation theory along with multicentered-multipole expansion method has been employed to evaluate the longrange intermolecular interactions, and a 6-exp potential function has been assumed for short-range interactions. The interaction energy values obtained during the different modes of molecular interactions have been taken as input to calculate the configurational probability at room temperature (300 K). On the basis of stacking, in-plane, and terminal interaction energy calculations, all possible geometrical arrangements between the molecular pairs have been considered. The effect of nonmesogenic and noninteracting solvent (benzene) has also been studied. Further, the analysis of conformational behavior provides valuable information on configurational freedom of a molecule that may be useful in understanding the structure of phases and their transitions.

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Substitution Effects on the Liquid Crystalline Properties of Thermotropic Liquid Crystals Containing Schiff Base Chalcone Linkages

Cited by 40 publications

References 41 publications

Synthesis and Phase Transition Behaviours of New Chalcone Derivatives

Synthesis and Phase Transition Behaviours of New Chalcone Derivatives

Synthesis and mesomorphic properties of new heterocyclic liquid crystals with Central Ester–Chalcone linkages

Molecular Structure and Conformational Behavior of a Nematogen—A Statistical Approach

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