The phase behaviour of 4-n-pentylphenyl-4′-n-heptyloxythiobenzoate

Ossowska‐Chruściel, M. D.; Zalewski, Sławomir; Rudzki, A.; Filiks, A.; Chruściel, J.

doi:10.1080/01411590600881958

Cited by 22 publications

(9 citation statements)

References 5 publications

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“…The 7OS5 compound, investigated in this study, is the compound with the shortest carbon chain in the nOS5 series which develops more than one liquid crystalline phase: an enantiotropic nematic (N) phase and a monotropic smectic C (SmC) phase. The nematic phase is characterized by a longrange orientational order only, while the SmC phase exhibits A few crystal phases of 7OS5 were observed and there were reported the influence of thermal treatment, deuteration and type of layer ordering in a flat cell on the polymorphism in the solid state (Chruściel et al, 1981;Ossowska-Chruściel et al, 2006). For the higher nOS5 homologues (n > 7), rich polymorphism of liquid crystalline phases is observed, including a nematic phase and smectic phases with different intralayer order.…”

Section: Introductionmentioning

confidence: 99%

Single crystal X-ray structure determination and temperature-dependent structural studies of the smectogenic compound 7OS5

Deptuch¹,

Jaworska–Gołąb²,

Kusz³

et al. 2020

Acta Crystallogr Sect B

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Structural characteristics of solid and liquid crystalline phases of 7OS5 (4-n-pentylphenyl-4′-n-heptyloxythiobenzoate), the achiral smectogenic mesogen with the shortest terminal carbon chain in the nOS5 homologous series, are studied by complementary methods. Simultaneously perfomed X-ray diffraction and differential scanning calorimetry occur to be a powerful tool to study metastable phases. The single crystal structure of a high-temperature phase, supercooled from the room temperature down to −183°C [orthorhombic crystal system; space group Pca21; a = 54.285 (5) Å, b = 5.5843 (3) Å, c = 14.841 (1) Å, Z = 8] is determined. Lamellar ordering of elongated molecules is stabilized by hydrogen bonds . Temperature dependence of unit-cell parameters in two crystal phases as well as structural parameters of liquid crystalline phases (smectic layer spacing, tilt angle, average distance between the long axes of molecules and correlation lengths) are determined by X-ray diffraction. The obtained results are compared with the data available for other compounds in the nOS5 homologous series.

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Section: Introductionmentioning

confidence: 99%

Single crystal X-ray structure determination and temperature-dependent structural studies of the smectogenic compound 7OS5

Deptuch¹,

Jaworska–Gołąb²,

Kusz³

et al. 2020

Acta Crystallogr Sect B

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“…At 1989, features of the antiferroelectricity of MHPOBC compound were reported by Chandani et al [2]. The properties of ferro-and antiferro- recorded signal depends on the wavelength, which allows for detecting the subtle changes of a texture color [8,9]. GSmX(−50…”

Section: Introductionmentioning

confidence: 99%

Studies of Phase Diagram and Glass Transitions of a Liquid Crystal with Ferro- and Antiferroelectric Phases

et al. 2013

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Based on the results of the dierential scanning calorimetry, of transmitted light intensity measurements and of texture observations the phase diagram of 4-(6-heptauorobutanoiloxyhexyloxy)biphenyl-4 -carboxylate(S)--4-(methyloheptyloxy-1-carbonyl)-phenyl (4H6) was obtained. The following phases were identied on cooling:isotropic, smectic A, smectic C * , smectic C * A phases and a highly ordered phase called SmX and its glass. During heating transformation from glass of SmX to SmX phase and then transition to a metastable Cr2 phase, evolving to the more stable Cr1 phase, were observed. On further heating SmC * A , SmC * and Sm phases were identied.When Cr2 was cooled, a glass transition was also observed.

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“…The temperature was controlled with a Linkam controller with an accuracy of ±0.1°C, coupled with Linkam programmable heating stage THMSE 600. A detailed description of our TLI measurements can be found in [20]. DSC scans were taken with a DSC 822e Mettler Toledo Star System DSC.…”

Section: Methodsmentioning

confidence: 99%

Phase polymorphism and thermal stability of new cholesterol thioesters derivatives

et al. 2015

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We report the fundamental properties of a series of new mesogens with cholesteric esters, cholesteryl 4-(4-alkoxybenzoylothio)benzoates C n H 2n+1 OC 6 H 4 COSC 6 H 4 COOch, where ch = cholesteryl, for n = 7-10, nOSBch in short. They share a common feature, which is a high temperature cholesteric mesophase. In addition, the n = 10 compound has a monotropic ferroelectric smectic C* phase. The chemical structure and purity of nOSBch were confirmed by standard methods: 1 H nuclear magnetic resonance (NMR), 13 C NMR, Fourier transform infrared spectroscopy and elemental analysis. Differential scanning calorimetry (DSC), polarising optical microscopy and transmitted light intensity were used to study the polymorphism of these mesogens. The substances were proved stable up to 240-270°C (thermal stability deduced from DSC scans). The crystal structures were determined from X-ray diffraction data. Possible conformational disorder as well as nearest-neighbours intermolecular interactions were inferred from quantum chemical calculations.

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The phase behaviour of 4-n-pentylphenyl-4′-n-heptyloxythiobenzoate

Cited by 22 publications

References 5 publications

Single crystal X-ray structure determination and temperature-dependent structural studies of the smectogenic compound 7OS5

Single crystal X-ray structure determination and temperature-dependent structural studies of the smectogenic compound 7OS5

Studies of Phase Diagram and Glass Transitions of a Liquid Crystal with Ferro- and Antiferroelectric Phases

Phase polymorphism and thermal stability of new cholesterol thioesters derivatives

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