ルイス塩基性ユニットと内部アルキンを有する共役系高分子膜に対するブレンステッド酸およびルイス酸改質

抄録

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, BF₃) 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 BF₃-vapor treatment shows a broad absorption band that indicates a charge transfer interaction. The coordination of BF₃ to P1 and P2 was determined by high performance solid-state ¹⁹F NMR spectroscopy. The existence of N-B coordination bonds and a weak BF₃-triple bond interaction were supported by the characteristic ¹⁹F chemical shifts and their relaxation times (T₁^F).