Conjugated polymers with strongly twisted backbones, such as MEHPPV with fluorinated vinylene units (F-MEHPPV), demand a redefinition of the all-important 'effective conjugation length' ECL, which we extract here by a facile graphical method. In MEHPPV (being essentially planar), the ECL coincides with the 'maximum conducive chain length' MCC and extends over about n ≈ 9 repetition units (RU). In F-MEHPPV, the MCC is similarly long with n ≈ 8, but the ECL localizes on just one RU. The strong twist in F-MEHPPV persists in the excited state, broadening the emission spectrum and quenching the fluorescence with reduced radiative and enhanced non-radiative rates.
Effective conjugation in conjugated polymers with strongly twisted backbones: A case study on fluorinated MEHPPV
Farinola, Gianluca M.;
2016-01-01
Abstract
Conjugated polymers with strongly twisted backbones, such as MEHPPV with fluorinated vinylene units (F-MEHPPV), demand a redefinition of the all-important 'effective conjugation length' ECL, which we extract here by a facile graphical method. In MEHPPV (being essentially planar), the ECL coincides with the 'maximum conducive chain length' MCC and extends over about n ≈ 9 repetition units (RU). In F-MEHPPV, the MCC is similarly long with n ≈ 8, but the ECL localizes on just one RU. The strong twist in F-MEHPPV persists in the excited state, broadening the emission spectrum and quenching the fluorescence with reduced radiative and enhanced non-radiative rates.| File | Dimensione | Formato | |
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J. Mater. Chem. C, 2016, 4, 6900.pdf
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