Soluble poly (o-toluidine) (POT), poly(o-anisidine) (PAs) and poly (o-
chloroaniline) (PCAn) were doped with camphorsulfonic acid (CSA). The
conductivity and UV-Vis spectra of the CSA-doped POT, PAs and PCAn wer
e studied. These properties were found to be dependent on the solvent
used. The cast films from m-cresol solution exhibit more effective dop
ing and higher conductivity.