One-Pot Synthesis and Characterization of All-Conjugated Poly(3-alkylthiophene)-block-poly(dialkylthieno[3,4-b]pyrazine)
- Pieter Willot ,
- David Moerman ,
- Philippe Leclère ,
- Roberto Lazzaroni ,
- Yannick Baeten ,
- Mark Van der Auweraer , and
- Guy Koeckelberghs
Abstract

The Kumada catalyst transfer polymerization (KCTP) was applied on dialkyl-substituted thieno[3,4-b]pyrazine monomer systems—a low-bandgap system consisting of a thiophene ring with a fused pyrazine ring which displays promising properties for use in electronic applications. The poly(thieno[3,4-b]pyrazine)s were synthesized through a chain-growth mechanism with best results using an external o-tolyl initiator. A block copolymer with poly(3-hexylthiophene) was successfully formed without impurities. It is shown by UV–vis, fluorescence, DSC, and AFM measurements that the electronically fundamentally different blocks influence each other substantially in terms of the self-assembly and the optical properties, generating materials with significantly different properties than the constituting homopolymers.
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