Structural investigation of a nonconjugated conducting polymer by solid state 13C nuclear magnetic resonance spectroscopy

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Abstract
The charge‐transfer mechanism in 1,4 cis‐polyisoprene is studied using solid state 13C NMR spectroscopy as a function of doping level of iodine. The CP/MAS NMR data show that the concentration of double bonds decreases as a consequence of doping. The overall results are consistent with previous observations and indicate that cation radicals –C+‖–C⋅‖– are formed upon doping and charge transfer. The double bonds are reformed as the doped samples are compensated with ammonia indicating reversibility of the doping. The measurements also indicate that the chain mobility is restricted in the doped regions compared to the undoped regions.