An electrochromic diquat-quaterthiophene alternating copolymer: A polythiophene with a viologen-like moiety in the main chain
M. Krompiec , I. Grudzka , M. Filapek , Łukasz Skórka , S. Krompiec , M. Łapkowski , M. Kania , W. Danikiewicz
AbstractA bis-bithiophenyl derivative of diquat, 3,10-bis(2,2′-bithiophene-5-yl)-6,7-dihydropyrido[1,2-a:2′,1′-c]pyrazinodiynium hexafluorophosphate (bt2dq), was synthesized by quaternization of 5,5″-bis(2,2′-bithiophene-5-yl)-2,2′-bipyridine with 1,2-dibromoethane. Its UV-vis absorption spectrum is explained by TD-DFT calculations. It shows the electrochemical properties characteristic for bipyridinium salts (viologens and diquats) and can be electropolymerized to form a conjugated polymer composed of alternating quaterthiophene and diquat blocks. The polymer has been characterised by cyclic voltammetry and UV-vis spectroelectrochemistry: it can be reversibly oxidized, with spectral signs of p-doping of the oligothiophene blocks, and reversibly reduced, with formation of viologen-like cation radicals, which dimerize or form π-stacks. © 2011 Elsevier Ltd.
|Journal series||Electrochimica Acta, ISSN 0013-4686, (A 35 pkt)|
|Keywords in English||Conjugated polymer; Diquat; n-Type semiconductor; Spectroelectrochemistry; Viologen|
|Not used for evaluation||yes|
|Publication indicators||= 12; = 12; : 2011 = 1.782; : 2011 = 3.832 (2) - 2011=4.039 (5)|
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