10.1021/ma3025656.s001 Esra Altınok Esra Altınok Simone Friedle Simone Friedle Samuel W. Thomas Samuel W. Thomas Furan-Containing Singlet Oxygen-Responsive Conjugated Polymers American Chemical Society 2013 polymer fluorescence quenching furan poly moietie singlet 1 O 2 pendant diarylfuran 2013-02-12 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Furan_Containing_Singlet_Oxygen_Responsive_Conjugated_Polymers/2445277 This paper describes conjugated polymers with 2,5-diarylfuran moieties as nonconjugated pendants that respond to singlet oxygen (<sup>1</sup>O<sub>2</sub>) by fluorescence quenching. By oxidizing the diarylfurans to more electron-poor moieties such as enol esters, singlet oxygen causes poly­(fluorene-<i>co</i>-phenylene) conjugated backbones to donate excited electrons to the oxidized pendants, resulting in quenching of up to 93% of the initial fluorescence of the polymer, while an analogous furan-substituted poly­(phenylene–ethynylene) showed no quenching upon furan–<sup>1</sup>O<sub>2</sub> reaction. All furan derivatives reacted rapidly with <sup>1</sup>O<sub>2</sub> (<i>k</i> = 10<sup>7</sup>–10<sup>8</sup> M<sup>–1</sup> s<sup>–1</sup>), with more electron-poor furans reacting more slowly, but yielding more efficient fluorescence quenching, than less electron-poor furans.