The synthesis and high optical birefringence of nematogens incorporating 2,6-disubstituted naphthalenes and terminal cyano-substituent

Hird, Michael; Toyne, Kenneth J.; Gray, G. W.; Day, SE; McDonnell, D. G.

doi:10.1080/02678299308031946

Cited by 213 publications

(45 citation statements)

References 39 publications

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“…Hird and coworkers from Hull University investigated analogues of phenyl tolanes with naphthalene moieties and butoxy or butylsulphanyl as well as cyano or isothiocyanato terminal groups [114,115]. Characteristic examples are given in Table 12.…”

Section: Phenyl Tolanesmentioning

confidence: 99%

High Birefringence Liquid Crystals

2013

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Liquid crystals, compounds and mixtures with positive dielectric anisotropies are reviewed. The mesogenic properties and physical chemical properties (viscosity, birefringence, refractive indices, dielectric anisotropy and elastic constants) of compounds being cyano, fluoro, isothiocyanato derivatives of biphenyl, terphenyl, quaterphenyl, tolane, phenyl tolane, phenyl ethynyl tolane, and biphenyl tolane are compared. The question of how to obtain liquid crystal with a broad range of nematic phases is discussed in detail. Influence of lateral substituent of different kinds of mesogenic and physicochemical properties is presented (demonstrated). Examples of mixtures with birefringence ∆n in the range of 0.2-0.5 are given.

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Section: Phenyl Tolanesmentioning

confidence: 99%

High Birefringence Liquid Crystals

2013

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“…Thus, present study is aimed to synthesize novel LC substances to understand and establish the effects molecular structure [20,22] on LC properties and evaluated data; will be interpreted in terms of molecular rigidity and flexibility. [23,26] …”

Section: Introductionmentioning

confidence: 99%

Mesomorphism Dependence on Molecular Rigidity Flexibility of Ester Compounds

Chauhan¹

2017

WJPR

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A Novel homologous series of mesogens have been synthesized and studied with a views to understand and establish the relations between molecular structure and liquid crystal properties of a Compounds.Totally eleven members of series synthesized. Mesogenic behaviors commences from C 6 member of a series and continued up to C 16 member. The rest of the members C 1 to C 5 are nonmesogenic.Mesogenic homologues ( C 6 to C 16 ) are enantiotropically nematogenic.

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“…Thermometric behaviors of novel homologues will be studied and will be characterized through analytical and spectral data. Evaluated thermometric data will be interpreted and discussed in terms of molecular rigidity and flexibility [12,13,14,15]. Then it's some LC properties will be compared with structurally similar series to derive group efficiency order etc.…”

Section: Introductionmentioning

confidence: 99%

Study of the Effect of Chalconyl Central Bridge on Mesomorphism

Rakhasia

Bhola

Bhoya

2015

ILCPA

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ABSTRACT.A novel homologous series of chalconyl ester derivatives of thermotropic type of liquid crystals (LC) variety have been synthesized with its general molecular formula RO-C 6 H 4 -CH=CH-COO-C 6 H 4 -CO-CH=CH-C 6 H 4 -N(CH 3 ) 2 (Para). Present investigation is planned with a view to understand and establish the relation between molecular structure and the mesomorphic behaviorur of the constituent homologue derivatives as well as to avail novel mesomorphic (LC) substances to the researcher working on multidisciplinary thermotropic LC material with different aims, objects and views at different angles. Novel homologous series consists of twelve homologues C 1 to C 5 homologues are nonliquid crystals (NLC) and the rest of the C 6 to C 16 are monotropically nematogenic liquid crystals. Transition temperatures and texture of the LC and NLC were determined by an optical polarizing microscopy equipped with heating stage (POM). Textures of nematic phase are threaded or schlieren. Analytical and spectral data confirms the molecular structures of homologues. Thermal stability for monotropy is very low of the magnitudes of few second and of negligible degree of temperature difference. Thermal properties of present novel series are compared with of structurally similar series, data interpreted in terms of molecular rigidity and flexibility to derive group efficiency order.

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The synthesis and high optical birefringence of nematogens incorporating 2,6-disubstituted naphthalenes and terminal cyano-substituent

Cited by 213 publications

References 39 publications

High Birefringence Liquid Crystals

High Birefringence Liquid Crystals

Mesomorphism Dependence on Molecular Rigidity Flexibility of Ester Compounds

Study of the Effect of Chalconyl Central Bridge on Mesomorphism

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