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 synthesized through a novel method. The method was accomplished by the reaction of parent aniline tetramer in the pernigraniline oxidation state with diphenylamine and N-phenyl-1,4-phenylenediamine in the leucoemeraldine oxidation state respectively. The oligomers in the leucoemeraldine oxidation state were characterized by IR, NMR, elemental analysis and MALDI-MS. Aniline pentamer and hexamer in the emeraldine oxidation state were synthesized by the 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.