Electrical conductivity and spectral properties of iodine‐doped poly(2‐ethynylpyridine)

This article includes the doping and dedoping behaviors, the electrical conductivity, and the spectral properties of poly(2‐ethynylpyridine) and iodine‐doped poly(2‐ethynylpyri‐dine). The doping ability of poly(2‐ethynylpyridine) having a pyridine substituent was greater than that of polyphenylacetylene having a phenyl substituent. The electrical con‐ductivty of iodine‐doped poly(2‐ethynylpyridine) increased with doping time and reached the value of about 5×10−3Ω−1 cm−1 when the mol ratio of iodine to poly(2‐ethynylpyridine) repeating unit was above 0.7. The spectral properties of poly(2‐ethynylpyridine) and iodine‐doped poly(2‐ethynylpyridine) were also studied by infrared and UV‐visible spectroscopies and thermogravimetric analysis.