13C NMR spectrum analysis of electrochemically prepared polythienylene films

The 13C NMR spectrum analysis of electrochemically prepared polythienylene films has been investigated. Both a film doped with ClO−4 ions (PT–ClO4) and an undoped film (PT0) through the electrochemical reduction of PT–ClO4 give only two sharp absorption bands. The spectra of PT–ClO4 and PT0 are remarkably similar to each other in shape. These results demonstrate that both polythienylene are well‐defined polymers with only two kinds of carbon atoms which are compatible with dominance of the α–α′ linkage. The upfield shift of the absorption band for PT0 compared with PT–ClO4 is consistent with the increase in electron density through the electrochemical reduction.