Terminal trifluoromethyl-alkoxy and-alkenyloxy nematic liquid crystals for LCDs with active matrix addressing

Skelton, G. W.; Brett, Pete; Jones, John C.; Kelly, Stephen M.; Minter, Victoria; Tuffin, Rachel P.

doi:10.1080/02678290010011580

Cited by 5 publications

(4 citation statements)

References 29 publications

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“…A range of liquid crystalline 1,4-disubstituted [2.2.2]octanes have been designed for use as components of nematic mixtures of positive dielectric anisotropy for TN-LCDs [9][10][11][12][13][14][15][16][17][18][19][20]. A number of these LCs incorporate phenyl rings with a halogen atom in a terminal or lateral position [13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Terminal end‐group efficiency for the nematic phase using model bicyclo[2.2.2]octanes

et al. 2007

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The synthesis is reported of new liquid crystals incorporating the 1,4-disubstituted bicyclo[2.2.2]octane ring and a series of substituents in a terminal position on the molecular core. The nature of the terminal substituent is varied from apolar with a small dipole moment to polar with a strong dipole moment. The angle of the dipole moment with respect to the molecular axis is also varied. An updated order of terminal group efficiency for substituents in a terminal position for the nematic phase is provided. The bicyclo[2.2.2]octane ring shields halogen substituents in a lateral position on phenyl rings attached to the bicyclooctane ring to a small degree and reduces the steric efects of these substituents, giving rise to high relative nematic-isotropic transition temperatures.

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Section: Introductionmentioning

confidence: 99%

“…A number of these LCs incorporate phenyl rings with a halogen atom in a terminal or lateral position [13][14][15][16][17][18][19][20]. However, the presence of two or three halogen atoms are required to generate a dipole moment large enough to induce a significant magnitude of the dielectric anisotropy [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Terminal end‐group efficiency for the nematic phase using model bicyclo[2.2.2]octanes

et al. 2007

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“…3,4 Selective enhancement of smectic phases is noted when perfluorinated hydrocarbon chains are employed. 5 To realize high dielectric anisotropy, significant and large longitudinal dipole moments are necessary, and they can be introduced on the long axis of the mesogen by polar functional groups such as F, CN, and NO 2 . There have been relatively few studies dedicated to enhancing the polarizability and dipole moments of liquid crystals using the hypervalent SF 5 group.…”

Section: Introductionmentioning

confidence: 99%

“…Fluorinated liquid crystals are expected to have low rotational viscosities. Several useful reviews have appeared, emphasizing the importance of the location of fluorine groups in the mesogenic structure. , Selective enhancement of smectic phases is noted when perfluorinated hydrocarbon chains are employed …”

Section: Introductionmentioning

confidence: 99%

SF₅-Terminated Fluorinated Schiff Base Liquid Crystals

et al. 2004

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Novel liquid crystals based on fluorinated carbon chains and terminated with SF 5 groups are presented for the first time. Attachment of an SF 5 group separated from a benzylidine group by a fluorinated spacer leads to monotropic nematic and smectic phases, while an enantiotropic nematic phase is observed in mixtures. The phase sequence of these new compounds is comparable to hydrocarbon analogues of nO.m (n-alkoxym-alkylbenzylidine) series. Despite a long alkoxy chain, the nematic f smectic A transition is closer to second order, with M TCP predicted ≈ 0.995 values that are even higher than for the nCB (n-alkylcyanobiphenyls) series. Single crystal and quantum computational studies suggest that electrostatic interactions play a major role in governing the value of M TCP . Molecular packing in the crystal structure exhibits monoclinic P2 1 /a symmetry. A flexible synthetic strategy that allows the synthesis of another homologous series with a bend in the molecular structure is also presented. The bent core structure of 10O.2 SF 5 investigated shows a monotropic, tilted smectic phase for the higher C 10 alkoxy chain. The compounds in this series reveal a high degree of undercooling (well above 50 °C), which is rationalized using finite size effects on nucleation.

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Multichiral liquid crystals based on terphenyl core laterally substituted by chlorine atom

Podoliak

Cigl

Hamplová

et al. 2021

Journal of Molecular Liquids

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Terminal trifluoromethyl-alkoxy and-alkenyloxy nematic liquid crystals for LCDs with active matrix addressing

Cited by 5 publications

References 29 publications

Terminal end‐group efficiency for the nematic phase using model bicyclo[2.2.2]octanes

Terminal end‐group efficiency for the nematic phase using model bicyclo[2.2.2]octanes

SF₅-Terminated Fluorinated Schiff Base Liquid Crystals

Multichiral liquid crystals based on terphenyl core laterally substituted by chlorine atom

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Terminal trifluoromethyl-alkoxy and-alkenyloxy nematic liquid crystals for LCDs with active matrix addressing

Cited by 5 publications

References 29 publications

Terminal end‐group efficiency for the nematic phase using model bicyclo[2.2.2]octanes

Terminal end‐group efficiency for the nematic phase using model bicyclo[2.2.2]octanes

SF5-Terminated Fluorinated Schiff Base Liquid Crystals

Multichiral liquid crystals based on terphenyl core laterally substituted by chlorine atom

Contact Info

Product

Resources

About

SF₅-Terminated Fluorinated Schiff Base Liquid Crystals