Polymers thienopyrazine-based

Wudl et al. synthesized a thienopyrazine-based monomer 3.21f (Chart 1.47) by attaching octyl groups at the 3-position of the thiophene moiety [334]. Monomer 3.21f was chemically polymerized with FeC to generate polymer P3.21f. The polymer covered a very broad absorption range from 300 to 980 nm. 

Co-oligomers of EDOT and thienopyrazine 3.24 were synthesized by Berlin et al. (Chart 1.47) [337, 338]. Similarly to other thienopyrazine-based polymers, electrochemically generated polymers of 3.24 exhibited ambipolar electroactivity. P3.24a had an in situ conductivity of 0.5 Scm in the oxidized state and 0.01 S cm in the reduced state and corresponding values for alkylated derivative P3.24b were 15 and 0.03 Scm Both polymers had broad absorption bands peaking at 950 nm, suggesting small bandgaps [337]. 

Cheng KF, Liu CL, Chen WC (2007) Small band gap conjugated polymers based on thiophene-thienopyrazine copolymers. J Polym Sci A Polym Chem 45 5872... 

Mondal R, Miyaki N, Becerril HA, Norton JE, Parmer J, Mayer AC, Tang ML, Bredas J-L, McGehee MD, Bao Z (2009) Synthesis of acenaphthyl and phenanthrene based fused-aromatic thienopyrazine co-polymers for photovoltaic and thin film transistor applications. Chem Mater 21 3618... 

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