Liquid Crystalline Structures of the 2-(<i>trans</i>-4-<i>n</i>-alkylcyclohexyl)propan-1,3-diols

Diele, Siegmar; Mädicke, A.; Geissler, Erik; Meinel, K.; Demus, D.; Sackmann, H.

doi:10.1080/00268948908037145

Cited by 30 publications

(6 citation statements)

References 3 publications

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“…In this point with respect to the temperature dependence, the results under discussion are different to those found for liquid-crystalline phases of derivatives of other diols [24], in which no temperature dependence could be observed. This was explained by the dense packing in the region of the interdigitated alkyl chains.…”

Section: Characterization Of the Mesophasescontrasting

confidence: 76%

Mesophase characterization of some long chain vicinal multihydroxy amphiphiles [1,2]

et al. 1992

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The mesophase characterization of three stereoisomeric multihydroxy compounds, the 1,2(S), 3(R),4(R)-, 1,2(R), 3(S), 4(R)-, and 1,2(S), 3(S),4(R)-icosanetetrols, as well as of an octadecafuranose derivative has been carried out by means of polarizing microscopy, X-ray diffraction etc. The four multiols with their very long flexible alkyl chains are mono-thermomesomorphic; their single mesophases are miscible with each other, with a typical carbohydrate derivative, and are characterized by X-ray diffraction having a layer structure without order in it. The phase transition data of the three icosanetetrols are strongly dependent on their stereochemistry. The measurements of the refractive indices of one of the tetrols show a typical behaviour known for S, phases or for lamellar phases, i.e. the sign of the birefringence is positive.

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Section: Characterization Of the Mesophasescontrasting

confidence: 76%

Mesophase characterization of some long chain vicinal multihydroxy amphiphiles [1,2]

et al. 1992

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“…Then we examined compounds where the thermotropic mesogenic group, a cyanobiphenyl moiety, was chemically attached to the surfactant hydrophobic chain . There have been previous reports on these materials, with much work on a variety of compounds by Tschierske et al, , on diol-containing mesogens, − and on double-chain quaternary ammonium compounds . Everaars et al .…”

Section: Introductionmentioning

confidence: 99%

Lyotropic Phase Behavior of Triethylammoniodecyloxycyanobiphenyl Bromide and the Influence of Added Thermotropic Mesogens

et al. 2000

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The lyotropic mesophases formed by the "amphitropic" surfactant triethylammoniodecyloxycyanobiphenyl bromide in water have been studied using optical microscopy, X-ray diffraction, and NMR. Only a lamellar mesophase occurs, but this has a wide temperature and composition range. There is a marked decrease in the estimated bilayer thickness (decrease in alkyl chain "ordering", increase of micelle surface curvature) with an increase of temperature, particularly at the lower surfactant concentrations. This is likely to arise from the occurrence of a defect-full lamellar phase with water-filled holes rather than a conventional structure with continuous bilayers. The influence on the liquid crystals of added thermotropic mesogens (pentylcyanobiphenyl and heptyloxycyanobiphenyl) has been compared with that of a conventional alkane, hexane. The mesogenic additives stabilize the (defective) lamellar phase, while hexane destabilizes it. The phase behavior and the NMR and the X-ray data all suggest that in the mesophase there are significant anisotropic attractive interactions between the oxycyanobiphenyl moieties, which are increased when the mesogenic additives are present. Some pointers for future directions in the search for true amphitropic mesophases are given. † Part of the Special Issue "Colloid Science Matured, Four Colloid Scientists Turn 60 at the Millennium".

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“…like soaps, tensides, phospholipids and sugars. Compound 26 [255] In recent years many different diols (e.g. [258][259][260][261]), tetraols [262-2651 and polyols (mainly derived from sugars [266][267][268][269][270]270 a]) have been synthesized.…”

Section: Associated Liquid Crystalsmentioning

confidence: 99%

Chemical Structure and Mesogenic Properties

Demus¹

1998

Handbook of Liquid Crystals Set

132

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Liquid Crystalline Structures of the 2-(trans-4-n-alkylcyclohexyl)propan-1,3-diols

Cited by 30 publications

References 3 publications

Mesophase characterization of some long chain vicinal multihydroxy amphiphiles [1,2]

Mesophase characterization of some long chain vicinal multihydroxy amphiphiles [1,2]

Lyotropic Phase Behavior of Triethylammoniodecyloxycyanobiphenyl Bromide and the Influence of Added Thermotropic Mesogens

Chemical Structure and Mesogenic Properties

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