Helical polyacetylene synthesized under chiral nematic liquid crystals

We synthesized helical polyacetylene films under asymmetric and anisotropic reaction field consisting of chiral nematic (N *) liquid crystals. A series of axially chiral binaphthols and chiral phenylcyclohexyl derivatives were used as chiral dopants to induce N * liquid crystals. Acetylene polymeriz...

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Bibliographic Details
Published in:Synthetic metals 1999-06, Vol.102 (1), p.1406-1409
Main Authors: Akagi, K., Piao, G., Kaneko, S., Higuchi, I., Shirakawa, H., Kyotani, M.
Format: Article
Language:English
Subjects:
Anisotropic reaction field
Applied sciences
Chiral nematic solvent
Circular dichroism
Exact sciences and technology
Helical structure
Morphology
Organic polymers
Physicochemistry of polymers
Polyacetylene
Polymers with particular properties
Preparation, kinetics, thermodynamics, mechanism and catalysts
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Summary:We synthesized helical polyacetylene films under asymmetric and anisotropic reaction field consisting of chiral nematic (N *) liquid crystals. A series of axially chiral binaphthols and chiral phenylcyclohexyl derivatives were used as chiral dopants to induce N * liquid crystals. Acetylene polymerizations were carried out with Ti(O- n-Bu) 4-Et 3Al under N * reaction field. Measurements of SEM and CD spectra showed that the polyacetylene films are composed of clockwise or counter-clockwise helical structures not only in fibril but also in each polyene chain. By virtue of its high electrical conductivity of 1.51.8 x 103 S/cm after iodine doping, the helical polyacetylene might serve as a molecular solenoid based on conducting polymer. The helicity of the present film also suggests a feasibility of second-order nonlinear optical material.
ISSN:0379-6779
1879-3290
DOI:10.1016/S0379-6779(98)00342-7