Synthesis of carbazole-based copolymers containing carbazole-thiazolo[5, 4-d]thiazole groups with different dopants and their fluorescence and electrical conductivity applications. Issue 73 (20th July 2016)

• Record Type: Journal Article
• Authors: Sathiyan, Govindasamy; Thangamuthu, Rangasamy; Sakthivel, Pachagounder
• Is Part Of: RSC advances. Volume 6:Issue 73(2016)
• Page Start: 69196
• Page End: 69205
• Publication Date: 2016-07-20
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra08888k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The electrical conductivity of poly(carbazole-thiazolo[5, 4- d ]thiazole) was measured with the introduction of five different dopants (HCl, Fe(iii ), Cu(ii ), H3 BO3, and I2 ) into its framework through protonation of a nitrogen atom or complex formation. Abstract : To improve the electrical conductivity of poly(carbazole-thiazolo[5, 4- d ]thiazole) (p-CzTT), five different dopants, such as HCl, Fe(iii ), Cu(ii ), H3 BO3, and I2, were introduced into its framework through protonation of a nitrogen atom or by complex formation. Carbazole-thiazolo[5, 4- d ]thiazole (CzTT) and poly(carbazole-thiazolo[5, 4- d ]thiazole) (p-CzTT) were synthesized by the reactions of carbazole aldehydes and dithiooxamide. The synthesized monomer and polymer were confirmed by FT-IR, UV-vis, 1 H, 13 C-NMR, and GPC studies. The doped polymers were examined by FT-IR spectroscopy, UV-visible absorption, fluorescence, thermogravimetric analysis (TGA), cyclic voltammetry (CV), and electrical conductivity. The optical band gap ( E optg) of CzTT and p-CzTT were found to be 2.74 eV and 1.95 eV, respectively. The thermal stability of the polymer showed 5% weight loss at 358 °C. Based on CV analysis, the HOMO and LUMO energy levels and the electrochemical band gap ( E cvg) of p-CzTT were obtained as −5.86 eV, −3.19 eV, and 2.67 eV, respectively. The CzTT and p-CzTT exhibited fluorescence emission at 461 nm and 448 nm, respectively. Among the dopants introduced, Fe(iii )- and I2 -doped polymer showed excellent electrical conductivities of 6.8 × 10 −5 S cm −1 and 5.9 × 10 −5 S cm −1, respectively.