
10: POLY(OXADIAZOLE)S 245
exhibit a significantly higher molecular weight and
have less structural defects as those prepared by the
polycondensation route.
10.2.3 Heck Coupling
Poly(p-phenylenevinylene) derivatives with 1,3,4-
oxadiazole and pyrazole rings along the main chain
have been synthesized by Heck coupling [42]. These
conjugated polymers are soluble in common organic
solvents due to a fully conjugated backbone with dode-
cyloxy side groups. Relatively high glass transition
temperatures up to 160
◦
C and a good thermal
stability are observed. The polymers emit blue-
greenish light with photoluminescence emission max-
ima around 490–500 nm in solution. ...