Synthesis and Characterization of Poly(o-toluidine) in Ionic Liquid and Lanthanum Chloride

Abstract

Poly(o-toluidine) of high conductivity (10.14 S cm^-1) was synthesized
 
by chemical process in a solution containing LaCl₃ and ionic liquid.
 
The conductivity, UV-Vis, FTIR spectra, X-ray diffraction and thermogravimetric
 
analysis were investigated. The results of conductivity
 
showed that the cooperative effect of La³⁺ and ionic liquid remarkably
 
improved the conductivity of poly(o-toluidine). Meantime, the energy
 
gaps of the π-π* and quinoid ring transitions are affected by the cooperative
 
effect of La³⁺ and ionic liquid in UV-Vis. The peak of Q-NH⁺-B
 
or B-NH⁺-B in poly(o-toluidine) doped with La³⁺ shifts to longer wavelength
 
in FTIR spectra in the presence of ionic liquid. La³⁺ and ionic
 
liquid hardly affect the crystallinity of poly(o-toluidine).