Dimerization of Some Liquid Crystalline 4′4′-Alkyl-Cyanophenyl Derivatives in Solid Phase and Inert Matrices

Шабатина, Т. И.; Khasanova, T.V.; Vovk, E.V.; Andreev, G. A.; Morosov, Yu. N.; Sergeev, G. B.

doi:10.1080/10587259608046033

Cited by 3 publications

(1 citation statement)

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“…Finally, we note that there is a frequency shift associated with homeotropic anchoring but not with planar anchoring. Recent transmission IR experiments and theoretical calculations based on the GAMESS program suite have shown that this shift is associated with the formation of dimers. − This correlates well with the observation of complete orientational wetting by homeotropic nematic molecules at the substrate−isotropic interface, when the substrate is very low energy. Namely, such a class of complete wetting would have to be driven by nCB−nCB interactions and/or structural entropy.…”

Section: Discussionsupporting

confidence: 53%

Polarized ATR-IR Studies of Surface-Field-Induced Anchoring of Alkyl Cyanobiphenyls

et al. 1998

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We report initial studies of the use of polarized ATR-IR spectroscopy to obtain information on molecular alignment, on the mesoscopic scale, in the interfacial region of alkyl cyanobiphenyl liquid crystals in contact with self-assembled monolayers (SAMs). Specific mesoscopic alignment was induced by variation of the surface field, via the ω-functional group of self-assembled monolayers of alkanethiol derivatives. Our experimental approach involved the deposition of a thin gold layer onto a ZnSe prism. The presence of this layer strongly attenuates the s-polarized field leading to an “effective surface selection rule”, which can be used to determine the average orientation of the liquid crystal molecules within the attenuation depth of the evanescent field. A frequency shift of the C⋮N stretching band was seen in the case of homeotropic anchoring.

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Section: Discussionsupporting

confidence: 53%

Polarized ATR-IR Studies of Surface-Field-Induced Anchoring of Alkyl Cyanobiphenyls

et al. 1998

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Production and spectroscopic study of low-temperature silver complexes with mesogenic cyanobiphenyl derivatives

Vovk¹,

Шабатина²,

Vlasov³

et al. 1997

Supramolecular Science

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Infrared Electroabsorption Spectroscopic Study of Association Structures of 5CB in the Solution, Isotropic Liquid and Nematic Liquid Crystal States

2002

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The association structures of 4-n-pentyl-4’-cyanobiphenyl (5CB) in the solution, isotropic liquid, and nematic liquid crystal states have been studied by infrared electroabsorption spectroscopy. In a 0.5 mol dm-3 carbon tetrachloride solution, the determined value of dipole moment of 5CB (4.9D) agrees excellently with a literature value (4.85D) for monomer, indicating that the 5CB molecule exist as a monomer. Monomeric response of the 5CB molecule to the external field has also been found for the isotropic liquid state. For the nematic phase, marked deviation from the monomeric response has been found, showing the domain formation of the 5CB molecules. The size dependence of the domain response to the applied electric field has also been elucidated.

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Dimerization of Some Liquid Crystalline 4′4′-Alkyl-Cyanophenyl Derivatives in Solid Phase and Inert Matrices

Cited by 3 publications

References 4 publications

Polarized ATR-IR Studies of Surface-Field-Induced Anchoring of Alkyl Cyanobiphenyls

Polarized ATR-IR Studies of Surface-Field-Induced Anchoring of Alkyl Cyanobiphenyls

Production and spectroscopic study of low-temperature silver complexes with mesogenic cyanobiphenyl derivatives

Infrared Electroabsorption Spectroscopic Study of Association Structures of 5CB in the Solution, Isotropic Liquid and Nematic Liquid Crystal States

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