We demonstrated the modification of conjugated polymers containing 2,5-prydinyl (
P1) and thiazole (
P2) in the film state by treatment with acid vapors. After the acid (HCl, BF
3) vapor treatments, the absorption spectra of
P1 films were red-shifted due to a charge transfer interaction between the electron-acceptor modified-2,5-pyridinyl moiety and the electron-donor 2,5-dioctyloxyphenylene unit. On the other hand, there is no clear absorption change in
P2 film after HCl vapor treatment, even through the spectrum after BF
3-vapor treatment shows a broad absorption band that indicates a charge transfer interaction. The coordination of BF
3 to
P1 and
P2 was determined by high performance solid-state
19F NMR spectroscopy. The existence of N-B coordination bonds and a weak BF
3-triple bond interaction were supported by the characteristic
19F chemical shifts and their relaxation times (
T1F).
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