Synthesis and optical properties of highly fluorescent oligo-(phenylene vinylene)

Oligo- and poly-mp-phenylene vinylenes were synthesized via metathesis and Heck coupling chemistry using (a) unsubstituted m- and p-divinylbenzenes, ( b) unsubstituted m- and p-divinylbenzenes copolymerised with norbornene dia cetate and (c) unsubstituted p-divinylbenzene and 4-alkoxy-1,3-dibromobenze ne (alkoxy pentyloxy and decyloxy). For(a) it could be observed that there is a shift to the blue in the photoluminescence if the concentration of inc orporated m-units in the oligomers is increased, for (b) that the quantum e fficiency is > 50% and for (c) that the substituents have little influence on the photoluminescence.