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Syntheses and Optoelectronic Properties of Quinoxaline Polymers: The Effect of Donor Unit

Sendur, Merve
Balan, Abidin
Baran, Derya
Toppare, Levent Kamil
Tuning the bandgap of electrochromic polymers is one of the important research topics in electrochromism. To understand clearly the effect of donor unit in donor-acceptor-donor-type polymers, 2,3-bis(4-tert-butylphenyl)-5,8-di(thiophen-2-yl)quinoxaline and 2,3-bis(4-tert-butylphenyl)-5-(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-8-(thiophen-2-yl)quinoxaline were synthesized and polymerized potentiodynamically. Their electrochemical and spectroelectrochemical studies were performed, and the results were compared with those of poly(2,3-bis(4-tert-butylphenyl)-5,8-bis(2,3-dihydro-thieno[3,4-b][1,4]dioxin-5-yl)quinoxaline) (Gunbas et al., Adv Mater 2008, 20, 691-695). A blue shift in the polymer pi-pi* transitions revealed that the bandgap of such polymers with the same acceptor unit is related to the electron density of donor units. (C) 2011 Wiley Periodicals, Inc. J PolymSci Part A: PolymChem 49: 4065-4070, 2011