Synthesis of monodisperse pheyl-capped oligoaniline pentamer and hexamer in the leucoemeraldine oxidation state and EB state and its UV studies

Aniline pentamer and hexamer in the leucoemeraldine oxidation state were sy nthesized through a novel method. The method was accomplished by the reacti on of parent aniline tetramer in the pernigraniline oxidation state with di phenylamine and N-phenyl-1,4-phenylenediamine in the leucoemeraldine oxidat ion state respectively. The oligomers in the leucoemeraldine oxidation stat e were characterized by IR, NMR, elemental analysis and MALDI-MS. Aniline p entamer and hexamer in the emeraldine oxidation state were synthesized by t he oxidation of Ag2O in DMF. It was found that some fragmentation occurred when the pentamer and hexamer were oxidized by (NH4)(2)S2O8 and FeCl3. 6H(2 )O. The pentamer and hexamer in the emeraldine oxidation state was studied by UV/Vis spectra. The relative intensity of exciton peak for pentaaniline showed a little increase compared with that of hexaaniline.