UNIQUE OPTICAL AND ELECTROCHEMICAL PROPERTIES OF PI-CONJUGATED ELECTRICALLY CONDUCTING COPOLYMERS CONSISTING OF ELECTRON-WITHDRAWING PYRIDINE UNITS AND ELECTRON-DONATING THIOPHENE UNITS

Electrically conducting pi-conjugated copolymers consisting of pi-excessive thiophene-2,5-diyl and pi-deficient pyridine-2,5-diyl monomer units show a unique cyclic voltammogram with an unusually large potential difference between the doping and the undoping peaks, and their electronic and fluorescence spectra support occurrence of intramolecular charge transfer showing absorption and fluorescence peaks at lower energy compared with those of the corresponding homopolymers.