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- W2073586999 abstract "Abstract A novel series of well-defined soluble poly[2,7-(9,9-dialkyfluorenyl)-alt-pyridinyl] (except for PDHFP-25, a polymer with same composition but different weight-average molecular mass ( M w ) was reported in reference [B. Liu, W.L. Yu, Y.H. Lai, W. Huang, Chem. Mater. 13 (2001), 1984–1991] were synthesized using palladium-catalyzed Suzuki cross-coupling reactions in good to high yields. In the series of alternating copolymers, 2,7-(9,9-dialkylfluorenyl) was used as the light emitting unit and the electron deficient pyridinyl unit was employed to provide improved electron transportation. All these polymers were characterized by 1 H NMR, 13 C NMR, GPC, thermal analyses, UV–vis and fluorescence spectroscopy. The shorter pendant 9,9-dihexyl at fluorenyl unit is better to polymer for higher thermal stability and higher T g than 9,9-dioctyl at fluorenyl unit. The meta-linkage (3,5- or 2,6-linkage) of pyridinyl units in the polymer backbone is more favourable to polymer for pure blue emission and prevention of aggregation of polymer chain than the para-linkage (2,5-linkage) of the pyridinyl units." @default.
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- W2073586999 date "2005-02-01" @default.
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- W2073586999 title "Novel fluorene–pyridine-based alternating copolymers: syntheis, characterization and optical properties" @default.
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