| Abstract
| - The thermochromic and solvatochromic properties of a series of fluorene-based conjugatedpolymers have been investigated. Both poly(2,7-(9,9-dioctylfluorene)) and poly(2,5-(thiophene)-alt-2,7-(9,9-dioctylfluorene)) have revealed interesting chromic properties which, on the basis of theoreticalcalculations, seem to be related to a relatively flexible backbone. On the other hand, the sterically hindered,nonplanar poly(2,5-(3,4-dimethylthiophene)-alt-2,7-(9,9-dioctylfluorene)) does not exhibit any significantsolvatochromic and thermochromic properties which could be explained by an important energy barrieragainst planarity. Finally, investigations on poly(2,5-(3,4-ethylenedioxythiophene)-alt-2,7-(9,9-dioctylfluorene)) have revealed a highly conjugated conformational structure which is not significantly modifiedupon temperature or solvent changes.
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