Mesogenic properties of cycloalkylmethyl 4-(4′-octoxybiphenyl-4-carbonyloxy)benzoate

Tsai, Wen‐Liang; Hsu, F. S. L.; Chen, Jo-Nan

doi:10.1080/02678290410001648679

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…The small rings with a long alkoxy chain behave like a long alkoxy chain and can, therefore, be used as a terminal group for the formation of the SmC phase. 16,17 Recently our primary results in a preliminary communication 18 indicated that cyclohexylmethanol, cyclopentylmethanol, cyclobutylmethanol, and cyclopropylmethanol can be used to provide terminal groups effective for the formation of liquid crystals exhibiting SmC phase. In order to study the influence of the ring size of the alicyclic rings and the chain length of the flexible alkoxy chain on the phase behavior, four series of compounds were synthesized and investigated.…”

Section: Introductionmentioning

confidence: 98%

Synthesis and Mesogenic Properties of Liquid Crystals Containing Terminal Cyclohexylmethanol, Cyclopentylmethanol, Cyclobutylmethanol and Cyclopropylmethanol Moiety

Chen

Hsu

Wang

et al. 2006

J Chinese Chemical Soc

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Four series of compounds 11~50 containing terminal alicyclic rings such as cyclohexylmethyl, cyclopentylmethyl, cyclobutylmethyl, and cyclopropylmethyl rings were synthesized and their liquid crystal behavior studied. The ring size and the length of flexible alkoxy chain influence the phase formation in different ways. While the smaller ring and the shorter alkoxy chain tend to favor the formation of the N phase, the larger ring and the longer alkoxy chain tend to favor the formation of the SmC phase. All the compounds except 11 and 21 exhibit SmA phases. The widest temperature range of the N, SmA, and SmC phases are found in the compounds 41, 46, and 20, respectively, which are 75 o C for 41, 115 o C for 46, and 100 o C for 20.

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Section: Introductionmentioning

confidence: 98%

Synthesis and Mesogenic Properties of Liquid Crystals Containing Terminal Cyclohexylmethanol, Cyclopentylmethanol, Cyclobutylmethanol and Cyclopropylmethanol Moiety

Chen

Hsu

Wang

et al. 2006

J Chinese Chemical Soc

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“…A low-temperature smectic phase, called SmX (i.e. undefined), occurs in different substances with quite different phases [18][19][20]. It has a simple lamellar structure with a layer spacing of ,34 Å and it develops a spontaneous polarization on cooling.…”

Section: Introductionmentioning

confidence: 99%

Dielectric spectroscopy of a smectic liquid crystal

2007

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Complex dielectric spectroscopy (frequency range 5 Hz-13 MHz) has been used to analyse the frequency, temperature and bias-field dependences of the molecular dynamics of a very highspontaneous-polarization ferroelectric liquid crystalline material exhibiting SmA, SmC* and unknown SmX smectic phases. Different smectic phase transition temperatures have been observed from the study of the temperature dependence of the dielectric strength and the relaxation frequency. The phase transition temperatures (crystalline to isotropic phases) have also been described very accurately from the temperature-dependent symmetric and asymmetric shape parameters of the relaxation function and also the dc conductivity. In a planar aligned cell, two symmetric modes (Goldstone mode and domain mode) have been observed in both the SmX and SmC* phases. One asymmetric mode (X-mode) observed in the SmC* and SmA phases could be related to the interaction of dipoles of the ferroelectric liquid crystals being affected by the surface of the cell. The soft mode, which usually appears very close to the SmC*-SmA phase transition was not observed until the bias field was applied. The second order nature of the SmC*-SmA phase transition was revealed.

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Aromatic Heterocycles Used as Terminal Groups of Calamitic Liquid Crystals

Liu

Huang

Cheng

et al. 2012

J Chinese Chemical Soc

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Three series of compounds 1-21 were prepared by using 2-, 3-, and 4-pyridinemethanol as terminal group of calamitic liquid crystals. These compounds have some similarities in their phase behavior. They all exhibit SmA phase. A tilt smectic phase, SmC, will be formed when their flexible alkoxy chain is longer than hexoxy group. The profound difference between them is that the compounds 15-17 possess a short temperature range of N phase. The compounds 3 and 6 have the widest SmA phase, up to 94°C, and SmC phase, up to 46°C, respectively. . fore, three series of compounds 1-21 were derived from 2-, 3-, and 4-pyridinemethanol and their mesogenic properties were studied. The synthesis and structures of these compounds are shown in Fig. 1. RESULTS AND DISCUSSIONThree series of compounds 1~21 were prepared by the esterification of seven analogous aromatic carboxylic acids and 2-pyridinemethanol, 3-pyridinemethanol, or 4-pyridinemethanol. Their structures were identified by IR, 1 H-NMR, 13 C-NMR, and MS. The spillting pattern and chemical shift of H-atom positioned ortho to hetero N-atom of pyridyl ring will give enough evidence to differentiate these three pyridyl ring system. The liquid crystal phases and phase transition temperatures of 1~21 were determined by DSC measurement and texture observation. These data

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Mesogenic properties of cycloalkylmethyl 4-(4′-octoxybiphenyl-4-carbonyloxy)benzoate

Cited by 3 publications

References 2 publications

Synthesis and Mesogenic Properties of Liquid Crystals Containing Terminal Cyclohexylmethanol, Cyclopentylmethanol, Cyclobutylmethanol and Cyclopropylmethanol Moiety

Synthesis and Mesogenic Properties of Liquid Crystals Containing Terminal Cyclohexylmethanol, Cyclopentylmethanol, Cyclobutylmethanol and Cyclopropylmethanol Moiety

Dielectric spectroscopy of a smectic liquid crystal

Aromatic Heterocycles Used as Terminal Groups of Calamitic Liquid Crystals

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