Merve İçli-Özkut, Jetmire Mersini, Ahmet M. Önal and Atilla Cihaner
Three eletrochromic polymers, poly(3,4-dihydro-3,3-bis((naphthalen-1-yl)methyl)-2H-thieno[3,4-b][1,4]dioxepine), poly(3,3-dibenzyl-3,4-dihydro-2H-selenopheno[3,4-b][1,4] dioxepine), and poly(3,3-dibenzyl-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepine), were synthesized electrochemically and the effect of substituents and heteroatoms on the electrochromic properties were investigated for the similar systems. All polymers show electrochromism from a colored state when neutralized to transmissive when oxidized. It was observed that, instead of using bulky substituents, flexible alkyl chains can also be used to increase optical contrast. Thus, using flexible alkyl groups will not only increase the optical contrast value but also enhance the solubility of corresponding polymer.