ON THE FLUORESCENCE OF SUBSTITUTED OLIGOTHIOPHENES

An anomalous behavior of the fluorescence of substituted oligothiophen es (alpha-alpha' linkages) as a function of the number of rings has be en reported. In this work we have theoretically investigated this phen omenon. Theoretical characterizations of both ground and excited state s of oligothiophenes were carried out through the use of sophisticated semi-empirical methods. Our results have shown that the experimentall y observed charge transfer suppression can be explained in terms of th e evolution and the nature of the electronic configurations.