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Alternate conjugated copolymers consisting of phenylene or biphenylylene unit and linear carbons unit such as cumulene and polyyne were synthesized. The optical property of these polymers was investigated by UV-Vis and fluorescence spectroscopies. Among cumulene-type polymers, the polymer having allene moiety showed a unique hypsochromic shift and intense blue fluorescence in solution, while poly(phenylenebutadiynylene)s,...
Helical polyacetylene recently developed is anticipated to show novel electromagnetic and optical properties. We have synthesized for the first time helical polyacetylene films with left- and right-handed screw structures under chiral nematic reaction field. We discuss the influence of the chiral nematic reaction field on film properties, morphology, crystal structure, electrical conductivity, and...
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