PREPARATION AND CHARACTERIZATIONS OF SOLUBLE REGULARLY ALTERNATING POLYAZOMETHINES FROM OLIGOTHIENYLENES

The preparation and characterization of oligothienylene dialdehydes an d related soluble copolymers in which thenylenic segments regularly al ternate with phenylenic portions linked by azomethine moieties is pres ented. The polymer series with three, six and eight thienylenic residu es showed interesting evidences of electronic confinement in low-gap s egments (thienylenic). Self-assembled structures of oligomers can be o btained either by evaporation in high vacuum or by a proper thermal tr eatment of spin coated films, depending on the molecule length. Polyme rs prepared by different synthetic routes show different thermal and s tructural properties as a function of the ratio of two possible isomer s at imino linkage. The order degree also influences the optical prope rties in fact luminescence data are strictly related to the percentage of the two isomers. (C) 1998 Elsevier Science B.V.