Synthesis and characterization of functionalized trough click chemistry poly(2,5-dithienylpyrrole) derivatives

In the first step of this study, the synthesis of electroactive and clickable, azide functionalized 2,5-dithienylpyrrole (SNS-N3) unit was achieved and as the latter step, the synthesis of alkyne functionalized fluorescent active groups were carried out. As the final step, the novel monomers of 9-((1-(2-(2,5-di(thiophen-2-yl)-1H-pyrrol-1-yl)ethyl)-1H-1,2,3-triazol-4-yl)methyl)-9H-carbazole (SNS-Karbazol), 1-(2-(2,5-di(thiophen-2-yl)-1H-pyrrol-1-yl)ethyl)-4-(9,9-dimethyl-9H-fluoren-2-yl)-1H-1,2,3-triazole (SNS-Floren) and 4-((anthracen-9-ylmethoxy)methyl)-1-(2-(2,5-di(thiophen-2-yl)-1H-pyrrol-1- yl)ethyl)-1H-1,2,3-triazole (SNS-Antrasen) were synthesized by the substitution of groups like carbazole, floren and antracene to the SNS-N3 through click chemistry. Characterization of the monomers and the intermediate compounds were performed by of 1H NMR, 13C NMR, MS, UV-Vis and fluorescence spectroscopy techniques. The redox behaviours of the monomers were investigated by cyclic voltametry and the homopolymers P(SNS-N3), P(SNS-Karbazol), P(SNS-Floren) and P(SNS-Antrasen) were achieved under appropriate conditions. Moreover, the copolymers of all of the monomers were achieved in the presence of 3,4-ethylenedioxythiophene (EDOT) through potentiodynamical or potentiostatical electrochemical polymerization. The surface morphologies of the homopolymers and copolymers were evaluated via SEM and AFM techniques. Furthermore, to determine the electrocromic properties of the polymers, spectroelectrochemistry, kinetic and colorimetric studies were carried out and as a result of these studies, the band gap, switching time, optical contrast, coloration efficiency and quantification of the colors of the polymers were obtained. In this study, the effects of substituent variation and copolymerization on the optoelectronic properties of the polymers were evaluated.