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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 21, Number 2
BKCSDE 21(2)
February 20, 2000 

Magnetic Properties of Conducting Polyanilines Induced by Organic Acids and Solvents
Kwang Sun Ryu, Soon Ho Chang, Sang Kuk Jeong, Eung Ju Oh, Chul Hyun Yo
Characteristic paramagnetism induced by organic acids and solvents was observed for conducting polyanilines. Most of spins in this material are localized below 100 K therfore the Curie spin contribution became large. Above 100 K, however, the polyaniline showed metallic features that is most spins are delocalized. Pauli susceptibility and total density of state at the Fermi level were determined as ~5 ×10 -5 emu/mol and 1-2 state/eV in 2-ring unit, respectively. Curie spin concentration reaches a maximum around 50 K. The effect of solvent on these magnetic properties need to be emphasized for the cases of emeraldine base (EB)-camphosulfonic acid (CSA) and dodecylbenzenesulfonic acid (DBSA)/acetic acid. This solvent can form the localized small spindomains, in which all the spins align parallel to each other at low temperature. The formation of spindomains increases the net magnetic dipole and finally enlarges the magnetic susceptibility.
238 - 240
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