New Liquid Crystalline Tetrahydropyran Derivatives

We synthesized new low polar derivatives of tetrahydropyran with nematic and smectic behaviour. Quantum chemical calculations show, that the most elongated conformers of the cyclohexane and tetrahydropyran derivatives have nearly identical molecular shape. The different liquid crystalline behaviour...

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Bibliographic Details
Published in:Molecular Crystals and Liquid Crystals 2009-01, Vol.509 (1), p.245/[987]-262/[1004]
Main Authors: Fujita, Atsuko, Masukawa, Tokifumi, Kawasaki, Subaru, Demus, Dietrich
Format: Article
Language:English
Subjects:
Chemical synthesis
Comparative studies
Crystallography
Mathematics
Molecular structure
nematics
quantum chemical calculations
synthesis
tetrahydropyrans
viscosity
Δϵ and Δn
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Summary:We synthesized new low polar derivatives of tetrahydropyran with nematic and smectic behaviour. Quantum chemical calculations show, that the most elongated conformers of the cyclohexane and tetrahydropyran derivatives have nearly identical molecular shape. The different liquid crystalline behaviour can be explained by different amounts of conformers deviating from the most elongated shape. The Δϵ and Δn have been calculated and compared with the experimental data obtained by extrapolation from basic mixtures. The two-ring compounds dissolved in the basic mixture have low order parameters and excellent solubility. By linear extrapolation, the two-ring compounds possess negative viscosities, but positive by logarithmic extrapolation.
ISSN:1542-1406
1563-5287
1527-1943
DOI:10.1080/15421400903065705