Evolution of the magnetic properties during the electrochemical doping and undoping of polyacetylene (CH)x with lithium

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Abstract
Electrochemical cells employing cis-rich polyacetylene as one electrode have been built in order to follow continuously in situ the evolution of its ESR characteristics during successive doping and undoping cycles. Very significant and almost reversible variations of the linewidth ΔHpp and asymmetry ratio A/B have been observed on either thin or thick samples. These variations are directly correlated with (i) the doping induced isomerization, (ii) the conductivity increase of the (CH)x film upon doping, and (iii) the sudden transition for the electronic spins system from a Curie-type behavior (degenerate semiconductor) to a Pauli-type one (metal).