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• W2105780713 abstract "Light-induced electron paramagnetic resonance (LEPR) measurements are reported in composites of poly(2-methoxy-5-(3-,7-dimethyloctyloxy)-1,4-phenylenevinylene) (MDMO-PPV) and ${[6,6]ensuremath{-}mathrm{p}mathrm{h}mathrm{e}mathrm{n}mathrm{y}mathrm{l}ensuremath{-}mathrm{C}}_{61}ensuremath{-}mathrm{b}mathrm{u}mathrm{t}mathrm{y}mathrm{r}mathrm{i}mathrm{c}$ acid methyl ester (PCBM), a soluble derivative of ${mathrm{C}}_{60}.$ Under illumination of the sample, two paramagnetic species are formed due to photoinduced charge transfer between conjugated polymer and fullerene. One is the positive polaron ${mathrm{P}}^{+}$ on the polymer backbone and the other is the radical anion on the methanofullerene. Using high-frequency (95 GHz) LEPR it was possible to separate these two contributions to the spectrum on the basis of their g factors, and moreover to resolve the g anisotropy for both radicals. The positive polaron on the conjugated polymer chain possesses axial symmetry with g values ${g}_{ensuremath{Vert}}=2.0034(1)$ and ${g}_{ensuremath{perp}}=2.0024(1).$ EPR on low doped polymer gave extra proof for the assignment to the positive polaron. The negatively charged methanofullerene has a lower, rhombic symmetry with ${g}_{x}=2.0003(1),$ ${g}_{y}=2.0001(1),$ and ${g}_{z}=1.9982(1).$ Different spin-lattice relaxation of both species gives rise to a rapid passage effect for the positive polaron spectrum." @default.
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• W2105780713 date "2001-10-19" @default.
• W2105780713 modified "2023-09-24" @default.
• W2105780713 title "High-frequency (95 GHz) electron paramagnetic resonance study of the photoinduced charge transfer in conjugated polymer-fullerene composites" @default.
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• W2105780713 doi "https://doi.org/10.1103/physrevb.64.195206" @default.
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