Circular dichroism spectra of regioregular poly{3 (S)-2-methylbutyl -thiophene} and of poly{3,4-di (S)2-methylbutyl -thiophene}

Ultraviolet absorption and Circular Dichroism spectra in the region 300-700 nm for highly regioregular samples of Poly{3[(S)- 2-methylbutyll-thiophene] are reported for solutions in good and poor solvents, at variable temperature, and for films in various conditions. In the latterc asen ovel CD datau p to the melting temperaturep rovide some hints for the self-assemblingp rocesst owards supramolecularo rganization. UV-visible and CD data are also reported on the related polymer Poly{3 ,4-di[ (S) -2-methylbutyl]- thiophene].