2B04 キラルネマティック液晶反応場でのヘリカルポリアセチレンの合成と性質 (I)

概要

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Helical polyacetylene is expected to be available for molecular solenoid and second order nonlinear optical material. We synthesized helical polyacetylene under chiral nematic(N^*) reaction field. The N^* liquid crystal was prepared by adding 1,1'-bi-2-naphthol derivative, (R)- and (S)-PCH506-Binol, as a chiral dopant into an equi-weight mixture of two kinds of nematic liquid crystal. Then we carried out acetylene polymerizations with Ti(O-n-Bu)_4-Et_3Al catalyst that was dissolved in the N^* liquid crystal. It is found from scanning electron microscope (SEM) observaions that the polyacetylene film is composed of helical fibrils. Circular dichroism (CD) spectrum of the polyacetylene film showed positive or negative Cotton effect, depending on the helicity. The electrical conductivity was about several thousands of S/cm at room temperature after iodine doping.
日本液晶学会の論文
1998-10-12