The EPR spectroscopy and the measurement of AC magnetic susceptibility have
been used to study the magnetic properties of poly(3-dodecylthiophene) dop
ed with FeCl3. The homogeneous doping (at a low level of the dopant) leads
to a high degree of diamagnetism, the extent of which depends on conformati
onal temperature changes and the amount of the dopant in a polymer. In this
work, the potential mechanism of diamagnetism generated in the system will
be discussed. (C) 2000 Elsevier Science B.V. All rights reserved.