title: Bandgap engineering through controlled oxidation of polythiophenes.
abstract: The use of Rozen's reagent (HOF⋅CH3 CN) to convert polythiophenes to polymers containing thiophene-1,1-dioxide (TDO) is described. The oxidation of polythiophenes can be controlled with this potent, yet orthogonal reagent under mild conditions. The oxidation of poly(3-alkylthiophenes) proceeds at room temperature in a matter of minutes, introducing up to 60 % TDO moieties in the polymer backbone. The resulting polymers have a markedly low-lying lowest unoccupied molecular orbital (LUMO), consequently exhibiting a small bandgap. This approach demonstrates that modulating the backbone electronic structure of well-defined polymers, rather than varying the monomers, is an efficient means of tuning the electronic properties of conjugated polymers.
authors: Department of Chemistry, Columbia University, 3000 Broadway, MC3124, New York, NY 10027 (USA) http://camposgroup.chem.columbia.edu.
authors: Sujun
authors: S
authors: Wei
authors: Jianlong
authors: J
authors: Xia
authors: Emma J
authors: EJ
authors: Dell
authors: Yivan
authors: Y
authors: Jiang
authors: Rui
authors: R
authors: Song
authors: Hyunbok
authors: H
authors: Lee
authors: Philip
authors: P
authors: Rodenbough
authors: Alejandro L
authors: AL
authors: Briseno
authors: Luis M
authors: LM
authors: Campos
keywords: Rozen’s reagent; donor-acceptor systems; n-type materials; polythiophene