Abstract
Two new polythieno[3,4-b]pyrazine derivatives, poly-10,12-bis(4-hexylthiophen-2-yl)dibenzo[f,h]thieno[3,4-b]quinoxaline (PDBTQ) and poly-8,10-bis(4-hexylthiophen-2-yl)acenaphtho[1,2-b]thieno[3,4-e]pyrazine(PATP) were synthesized by electrochemical polymerization and their electrochemical propertiesreported. Electroactivity of the monomer and electrochemical redox behavior of its polymerswere investigated by cyclic voltammetry. Spectroelectrochemical analysis was performed andthe band gaps of the polymers were determined as 2.0 eV and 1.2 eV from the onset of theπ–π* transitions of PDBTQ and PATP, respectively. The polymer PDBTQ shows multicoloredelectrochromic behavior with five distinct states—orange (0.0 V), yellow (+0.30 V), brown(+0.50 V),green (+0.65 V), blue-gray (0.80 V); PATP has two distinct colors—transmissive gray (0.0 V) and green (+0.80 V). The polymers revealed superior optical contrast in the near-infrared (NIR) region withfast switching times of less than 1 s.
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