Synthesis and characterization of some novel polythiophene derivatives containing pyrazoline

• Published in: Designed monomers and polymers Vol. 25; no. 1; pp. 136 - 147
• Main Authors: Trung, Vu Quoc, Duong, Tran Thi Thuy, Dua, Nguyen Thi, Linh, Nguyen Ngoc, Cuong, Lai Dang, Thao, Dao Phuong, Huy, Vo Khac, Phuong, Nguyen Hoang Ha, Hien, Nguyen, Linh, Duong Khanh, Manh, Vu Quoc, Chinh, Nguyen Thuy, Hoang, Thai, Van Meervelt, Luc
• Format: Journal Article
• Language: English
• Published: England Taylor & Francis 31.12.2022; Taylor & Francis Ltd; Taylor & Francis Group
• Subjects: chemical polymerization; Chemical synthesis; Chemistry; crystal structure; Electrical resistivity; Ethanol; Ferric chloride; Full Length; Morphology; NMR; Nuclear magnetic resonance; Optical properties; Polymerization; Polymers; Polythiophene; Polythiophene derivatives; pyrazoline heterocycle; Secondary schools; Solvents; Thermal stability; crystal structure; pyrazoline heterocycle; Polythiophene derivatives; chemical polymerization
• ISSN: 1385-772X; 1568-5551; 1568-5551
• DOI: 10.1080/15685551.2022.2086413

Eight polythiophene derivatives containing pyrazoline side groups were synthesized by a chemical oxidative coupling polymerization using FeCl 3 . The crystal structures of four monomers were determined which confirm the almost perpendicular orientation of the thiophene and pyrazoline rings, while the other substituents are more coplanar. Analyses of IR, 1 H-NMR, Raman and UV-Vis spectra demonstrated that the suggested polymerization was successful to generate the synthesized polythiophenes with the expected structures. The morphology of the synthesized polythiophenes was studied by SEM. The different substituents attached to the 1- and 3-positions of the pyrazoline side chain led to differences in optical properties, electrical conductivity, and thermal stability of the synthesized polythiophenes. By adding a pyrazoline side chain to polythiophenes, some polymers achieve good solubility, electrical conductivity of about 1.3 × 10 -6 S/cm, high fluorescence intensity (above 40,000 a.u.) at 505-550 nm and thermal stability up to 590°C in the air.