Abstract
Three new carbazole-containing polymers were synthesized through Suzuki cross-coupling between N-octylcarbazole-3,6-bis(ethyleneboronate) (NOctCz(BO2Et)2) and several arylene dibromides. 2,5-Dibromothiophene (DBT), 2,2‘-dibromo-5,5‘-bithiophene (DBBT), and 4,7-dibromo-2,1,3-benzothiadiazole (DBBTD) gave the three polymers PCzTh, PCzBi, and PCzBTD, respectively. Cyclic voltammetry showed two separate redox processes for each polymer, PCzTh (E1/2 = 0.33 V and E1/2 = 0.65 V vs Fc/Fc+), PCzBi (E1/2 = 0.32 V and E1/2 = 0.60 V vs Fc/Fc+), and PCzBTD (E1/2 = 0.56 V and E1/2 = 0.84 V vs Fc/Fc+). The two redox couples signify the presence of stable radical cation and dication oxidation states. In addition, the three materials were observed to display electrochromic properties. UV/vis/NIR absorbance spectroscopy revealed that each of the polymers displayed a unique absorbance maximum (345 nm for PCzTh, 375 nm for PCzBi, and 460 nm for PCzBTD) in their neutral states. Spectroelectrochemical analyses demonstrated tha...
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