New n-type rigid rod full aromatic poly(l,3,4-oxadiazole)s and their application in organic devices

By introducing linear or branched alkoxy groups as side chains into the backbone, it is possible to synthesize rigid rod fully aromatic poly(l,3,4-oxadiazole)s which are soluble in organic solvents. Two different synthetic routes are used. First, a classical polycondensation reaction is developed involving an aromatic diacid dichloride and a dihydrazide followed by a ring closure reaction. As another polymerization reaction, the Suzuki coupling reaction is applied to synthesize polymers with a well-defined structure. The charge transport and optical properties are investigated by cyclic voltammetry (CV), current-voltage measurements and both absorption and photoluminescence spectroscopy. According to the CV-measurements, the oxadiazoles possess electron transport properties. First results will be presented about the application of these polymers in diodes. (C) 2001 Elsevier Science B.V. All rights reserved.