Thuong H. Nguyen, Cheng Zhang, Rui Li and Sam-Shajing Sun Synthesis and characterization of new sulfone-derivatized phenylenevinylene-based conjugated copolymers with evolving energy levels and gaps Journal of Polymer Science Part A: Polymer Chemistry 50
A series of stable, processable, and end functionalizable sulfone phenylenevinylene based conjugated polymers with different donor co-monomers have been synthesized and characterized. The donor/acceptor interactions cause red shift in absorption and narrowing of resulting polymer LUMO/HOMO energy gaps. The color of the polymers in solvent tetrahydrafuran (THF) changes from dark red to light red, and to light greenish yellow for P(pyrrole-SFPV), P(OC6TV-SFPV), and P(TV-SFPV), respectively. Narrowing of energy gaps of polymers are partly due to the increasing electron donating strength from benzene to pyrrole, as well as the lowering resonance energies of 36 Kcal/mol for benzene, 29 Kcal/mol for thiophene, and 22 Kcal/mol for pyrrole.
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