Abstract
Polyacetylene film, containing varying amounts of trans isomer, has been chemically oxidized with SnCl 4. The reaction product has been studied by Mössbauer spectroscopy. The results suggest the existence of SnCl 5 − as the inserted species. From the temperature dependence of the recoil-free fraction the Mössbauer lattice temperature, θ, was estimated as 95K. This low value of θ indicates a significant mobility of SnCl 5 − ions at RT. Raman and EPR results are consistent with the Mössbauer effect measurements. Upon doping a broad ( Δ Hpp = 5 G ) EPR line, which is a super-position of the lines characteristics of all trans polyacetylene and cis-rich polyacetylene, is transformed into a narrow ( Δ Hpp = 0.8 G ), slightly assymetric ( A/ B = 1.23 ) line characteristic of partially oxidized trans-(CH) x chain of high conductivity. The same doping induced isomerization can also be evidenced by Raman spectroscopy showing the disappearance of cis-(CH) x modes after the oxidation.
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