Abstract
57Fe Mössbauer spectroscopy and EPR spectroscopy were applied to study the chemical nature of the intercalant in polyacetylene oxidized (doped) chemically with FeCl 3 and FeBr 3. For the (CH) x/FeCl 3 system the Mossbauer lattice temperature ( θ M = 89 K) was estimated from the temperature dependence of the recoil-free fraction. The strong influence of the high Fe III state of the dopant is clearly evidenced through EPR spectra of both systems: while the chloride system shows a superposition of a narrow and a broad lines, the bromide one exhibits only a narrow line, whose intensity decreases with increasing dopant concentration.
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