Chemical synthesis, characterization, and properties of conducting copolymers of imidazole and pyridine

Abstract

A series of conducting copolymers were synthesized by chemical oxidative polymerization of imidazole (Imi) and pyridine (Py) in acetonitrile medium at ambient temperature. The yield, solubility, and conductivity of the copolymers were measured by changing the Imi/Py molar ratio from 0/100 to 100/0. The as-prepared Imi/Py conducting copolymers were characterized by UVVisible, FTIR, 1 H-NMR, DSC, TGA, and XRD. The results suggest that the resulting copolymers were more easily soluble in most of the organic solvents than in polyimidazole. The polymer obtained is a real copolymer containing imidazole and pyridine units, but the Imi content calculated on the basis of the proton NMR spectra is lower than feed Imi content. The thermostability of the Imi/Py copolymer increases with increasing Imi unit content. The copolymers show comparatively higher conductivity and higher thermal stability than the homopolymer polypyridine and are lower than those of polyimidazole.

Charge Transfer Platform and Catalytic Amplification of Phenanthroimidazole Derivative: A New Strategy for DNA Bases Recognition

“…The monomer and its derived polymer show similar signals at 1271 and 1272 cm –1 owing to the C–N stretching from tertiary amines . The peaks at 1450 cm –1 of monomer and 1455 cm –1 of polymer are attributed to the CN- stretching band of imidazole . The absorption band around the 1050–1100 cm –1 region can be ascribed to the out of plane bending vibrations of the aromatic ring.…”

“…39 The peaks at 1450 cm −1 of monomer and 1455 cm −1 of polymer are attributed to the CN-stretching band of imidazole. 40 The absorption band around the 1050−1100 cm −1 region can be ascribed to the out of plane bending vibrations of the aromatic ring. The peaks at the region from 690 to 550 cm −1 are assigned to the stretching vibrations of C−Br.…”

Chemical and physical properties of low-molecular-weight poly(2,6-dimethyl-1,4-phenylene oxide) (LMW-PPO) synthesized by peroxydisulfate and metal/non-metal catalysts

“…The low PPO yield of 42.3% and the high DPQ content of 15.2% in the obtained PPO indicate that pure water is not appropriate for producing PPO with PDS, but facilitates the formation of more DPQ (Table S1 †). Given that CH 3 CN is always an appropriate solvent for organic synthesis with PDS as the oxidant, 35,36 CH 3 CN was then used in the following experiments. Fig.…”

Functionalization of Graphene Derivatives with Conducting Polymers and Their Applications in Uric Acid Detection

“…When analyzed by FTIR spectroscopy, the PImox-GO composite presented IR bands characteristic of both PIm and GO. Therefore, the IR bands assigned to the C=C vibrational mode of the aromatic ring and the C=N-stretching vibration, located at 1642 and 1468 cm −1 , respectively, were attributed to PIm, together with the bands situated at 2850 and 2918 cm −1 belonging to the stretching vibration of C-H bonds [46,47]. In addition, the corresponding C=C bond band (1642 cm −1 ) in the PIm-GO spectrum was stronger than that for PIm.…”