Synthesis and self-assembly of a chiral alternating sexithiophene-undeca(ethyleneoxy) block copolymer

An oligothiophene/chiral oligo(ethyleneoxy) block copolymer (PolyT6) has been synthesized in which a sexithiophene block alternates with a well-defined chiral undeca(ethyleneoxy) block. The polymer shows good soly. in chloroform, and UV-visible studies in this solvent reveal a spectrum similar to that of the chirally substituted monomeric sexithiophene (T6) analog. The aggregation of PolyT6 occurs in dioxane; however, no helicity is present in this aggregate, in contrast to aggregated T6. This behavior illustrates that although the processability and mech. robustness of block copolymers may be superior to those of analogous oligomers, the degree of self-assembled order found in oligomer-based systems may be lost in the polymers. [on SciFinder (R)]