Structure of polyfurane/perchlorate doped films by FTIR spectroscopy: Effect of the synthesis conditions

The structure of stable polyfurane films doped with perchlorate anions (PFu /ClO4), electrogenerated at constant deposition overpotential, has been stu died by FTIR spectroscopy. Electropolymerization overpotential, and monomer /electrolyte concentration ratio were the variables analyzed in this study as a mean of determining the synthesis conditions that would best produce m ore aromatic polymers (which would imply a larger extended pi-conjugated sy stem). The spectra revealed a clear influence of both variables on the film s generated, and although ring opening was detected, justified by the exist ence of aliphatic CH, OH, and C=O stretching vibrations, the spectra of the se electroactive films showed higher aromaticity than had been previously r eported by others authors. To study the aromaticity level and ring rupture of the PFu/ClO4 films, the experimental profile of the 1829-1345 cm(-1) FTI R region was fitted to theoretical function, and the resulting three bands were assigned and analyzed as a function of the synthesis conditions. (C) 2 000 John Wiley & Sons, Inc.