Poly(p-phenylene-1.3.4-oxadizole) (POD) shows two solid state modifica
tions which can be distinguished by X-ray diffraction and IR-spectrosc
opy. Molecular modelling reveals that the chain conformations of both
forms are different. Aromatic poly(1,3,4-oxadiazole)s can be electroch
emically doped by reduction reaction whereby radical anions are formed
. The influence of the molecular aromatic structure on the reduction p
otential is discussed in detail,