A new precursor, 1,3‐bis(2‐thienylmethylene)1‐1H,3H1‐thieno‐[3,4‐c]thiophene(9), for polyarenemethylenes (PAM), which are predicted to be low band gap polymers, is obtained by a Knoevenagel‐type condensation of 1H,3H1‐thieno[3,4‐c]thiophene 2‐oxide (7) with 2‐thiophenecarbaldehyde followed by reduction of the intermediate sulfoxide 8 with 2‐chloro‐1,3,2‐benzodioxaphosphole. Several investigations with cyclic voltammetry and UV‐Vis‐NIR spectroelectrochemistry (SEC) are carried out on 9. The experimental data are compared with the results of electronic band structure calculated on the basis of an MNDO‐optimized geometric structure by VEH pseudopotential method.
- 1H,3H1‐Thieno[3,4‐c]thiophene derivative
- Polymers, low band gap
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