For the purpose of preparing materials for nonlinear optics applications, a 3-ethylthiophene
bearing an NLO-active chromophoric group as a substituent at the end of the ethylic chain was
copolymerized with 3-hexylthiophene. Different FeCl3-based oxidative polymerization conditions in solvents
such as CH3NO2 and CCl4 and their effects on the copolymers characteristics and solubility in CHCl3
(i.e., the copolymer’s soluble fraction) were examined. This work allowed to achieve a satisfactory
chloroform-soluble fraction of the copolymer, still containing a notable amount of NLO-active group, and
to tune to some extent the main characteristics of the copolymer; moreover, the behavior of the monomerssolvent-
oxidant system was investigated.
