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Abstract The electrical conductivity of crystalline polyacetylene films having various cis‐trans compositions was measured. The resistivity and the energy gap of a 92,5% trans polymer were 1,01·10 4 Ω·cm and 0,56 eV, respectively, whereas the values of a 20,0% trans polymer were 2,35·10 8 Ω·cm and 0,93 eV, respectively. These differences are discussed in terms of the effective conjugation length estimated from visible spectra and ESR measurements, and the spacing between molecular planes obtained by x‐ray diffraction measurements.
Shirakawa et al. (Thu,) studied this question.
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