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I 2 -doped and pyrrole ring-iodinated semi-conducting oligomers of N-vinyl-3-alkyl-2-phenylpyrroles have been synthesized by free-radical polymerization of the above monomers (AIBN, 2–5wt%, 60–80°C) and further exposure of the oligomers obtained to I 2 vapor. The parent oligomers exhibit paramagnetic and fluorescent properties and stable up to 300–370°C.