Innis, PC;Masdarolomoor, F;Kane-Maguire, LAP;Forster, RJ;Keyes, TE;Wallace, GG

2007

November

Journal of Physical Chemistry B

Chemical and photoluminescence properties of purified poly(2-methoxyaniline-5-sulfonic acid) and oligomer

Published

16 ()

CONDUCTIVE POLYMERS POLYANILINE NANOTUBES POLYMERIZATION ANILINE ELECTROCHEMISTRY FLUORESCENCE ELECTROSYNTHESIS FILMS FORM PH

111

12738

12747

Both the chemical and the electrochemical synthesis of poly(2-methoxyaniline-5-sulfonate) (PMAS) in aqueous media have been found to give two distinct polymer fractions with molecular weights of approximately 8-10 and 2 kDa, respectively. It is now possible to isolate the pure high molecular weight (HMWT) PMAS and low molecular weight (LMWT) PMAS oligomer and to study their individual and combined photochemistry and redox chemistry. The HMWT PMAS fraction was confirmed to be an emeraldine salt by its characteristic redox and pH switching behavior, in contrast to the oligomeric LMWT PMAS, which was inert under the same conditions. Mixtures of these two fractions exhibit photoluminescence arising from the oligomeric LMWT PMAS fraction. The observed LMWT PMAS emission was modulated by the presence of the conducting HMWT PMAS emeraldine salt via a static resonant energy transfer arising from quenching at 460 nm when excited at 355 nm. The nonlinear fluorophore-quencher behavior suggests that the two PMAS fractions are strongly associated. The behavior fitted the static Perrin quenching model in which the oligomeric LMWT PMAS fluorophore is diffusionally restricted by the presence of HMWT PMAS quencher.

WASHINGTON

1520-6106

10.1021/jp075395o