Liquid Crystalline Thiadiazole Derivatives IV New Liquid Crystalline Materials With Broad Smectic C Ranges

Tschierske, Carsten; Zaschke, H.; Kresse, H.; Mädicke, A.; Demus, D.; Girdziunaite, D.; Bak, G. Y.

doi:10.1080/00268949008038598

Cited by 33 publications

(12 citation statements)

References 6 publications

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“…Zaschke et al found that the low-molecular weight [23][24][25] derivatives form thermotropic nematic and smectic LC phases. We reported that twin 2,5-diphenyl-1,3,4-thiadiazoles having an octamethylenedioxy chain in the center have more stable LC melts than the corresponding 2,5-diphenyl-1,3,4-oxadiazole derivatives.…”

Section: Introductionmentioning

confidence: 99%

Thermotropic Liquid Crystalline Polymers Having Five-Membered Heterocycles as Mesogens, 7. Synthesis and Photoluminescent Properties of Semi-Rigid Thermotropic Liquid Crystalline Polyesters Based on a Quaterphenyl Analog of 2,2′-Bis(1,3,4-thiadiazole)

Sato

Notsu

Nakashima

et al. 2001

Macromol. Rapid Commun.

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Section: Introductionmentioning

confidence: 99%

Thermotropic Liquid Crystalline Polymers Having Five-Membered Heterocycles as Mesogens, 7. Synthesis and Photoluminescent Properties of Semi-Rigid Thermotropic Liquid Crystalline Polyesters Based on a Quaterphenyl Analog of 2,2′-Bis(1,3,4-thiadiazole)

Sato

Notsu

Nakashima

et al. 2001

Macromol. Rapid Commun.

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“…Many series of liquid crystalline compounds containing heterocyclic groups have been synthesised due to their potential wide range of application, such as in optical, electrical and biomedical fields [8,9]. Heterocyclic compounds such as five-membered thiadiazole or thiophene rings can be incorporated into the principal structure of calamitic mesogens [10][11][12][13]. Barbera et al [14] have synthesised 2-pyrazoline derivatives and studied their optical and mesogenic properties.…”

Section: Introductionmentioning

confidence: 99%

Mesogenic quinazolone derivatives: synthesis and characterisation

Prajapati

Modi

2010

Liquid Crystals

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Two new mesogenic homologous series of quinazolone derivatives have been synthesised by condensation of 4-n-alkoxybenzoyloxy benzaldehyde (for series I) / 4-n-alkoxy-3-methoxybenzoyloxy benzaldehyde (for series II) with 3-amino-2-methyl quinazolone in alcohol. The synthesised compounds are characterised by a combination of elemental analysis and standard spectroscopic methods. In series I, all the synthesised members exhibit the nematic mesophase. An enantiotropic smectic A phase is observed from the n-decyloxy derivative onward to the last homologue synthesised. Methoxy to n-propyloxy derivatives of series II are non-mesogenic, whereas the rest of the members exhibit a monotropic nematic mesophase. The mesomorphic properties of the present series I and II are compared with each other and with the other structurally related mesogenic homologous series to evaluate the effect of lateral methoxy substituent and quinazolone moiety on mesomorphism.

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“…Various low molecular weight compounds and polymers composed of five-membered heterocycles like furan, thiophene and 1,3,4-thiadiazole rings are reported to form stable thermotropic LC mesophases [1][2][3][4][5][6][7][8] . Zaschke et al reported preparation of a series of 2-phenyl-or 2,5-diphenyl-1,3,4-thia-and -oxadiazole derivatives analogous to biphenyls or terphenyls having flexible units at both sides or in the central part and found that the thiadiazole unit is a good smectogen [6][7][8] . The 1,3,4-thiadiazole derivatives show nematic and smectic mesophases in spite of bent molecular structures, but the corresponding 2,5-diphenyl-1,3,4-oxadiazoles form no LC phases 6) .…”

Section: Introductionmentioning

confidence: 99%

Thermotropic liquid-crystalline polymers having five-membered heterocycles as mesogens, 3. New semi-rigid thermotropic liquid-crystalline polyesters based on a twin biphenyl analogue of 1,3,4-thiadiazole

Sato¹

1999

Macromol. Rapid Commun.

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SUMMARY: New semi-rigid thermotropic liquid crystalline (LC) polyesters containing a twin biphenyl analogue of 1,3,4-thiadiazole in the main chain were prepared by melt polycondensation of the bismethyl ester derivative of twin 2-phenyl-1,3,4-thiadiazole having a decamethylene segment in the central part with three aliphatic diols. The polymer with an octamethylene segment forms a monotropic nematic phase and those with decamethylene and dodecamethylene segments form enantiotropic smectic phases, although their LC states are unstable. The melting and isotropization temperatures decrease with increasing length of alkylene spacers.

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Liquid Crystalline Thiadiazole Derivatives IV New Liquid Crystalline Materials With Broad Smectic C Ranges

Cited by 33 publications

References 6 publications

Thermotropic Liquid Crystalline Polymers Having Five-Membered Heterocycles as Mesogens, 7. Synthesis and Photoluminescent Properties of Semi-Rigid Thermotropic Liquid Crystalline Polyesters Based on a Quaterphenyl Analog of 2,2′-Bis(1,3,4-thiadiazole)

Thermotropic Liquid Crystalline Polymers Having Five-Membered Heterocycles as Mesogens, 7. Synthesis and Photoluminescent Properties of Semi-Rigid Thermotropic Liquid Crystalline Polyesters Based on a Quaterphenyl Analog of 2,2′-Bis(1,3,4-thiadiazole)

Mesogenic quinazolone derivatives: synthesis and characterisation

Thermotropic liquid-crystalline polymers having five-membered heterocycles as mesogens, 3. New semi-rigid thermotropic liquid-crystalline polyesters based on a twin biphenyl analogue of 1,3,4-thiadiazole

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