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Synthesis and characterization of poly(fluorene-co-alt-phenylene) containing 1,3,4-oxadiazole dendritic pendants

All Rights Reserved. Synthesis and characterization of poly(fluorene-co-alt-phenylene) containing 1,3,4-oxadiazole dendritic pendants. Wu, Chung-Wen; Sung, Hsiao-Hsien; Lin, Hong-Cheu (Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, Taiwan). Journal of Polymer Science, Part A: Polymer Chemistry, 44(23), 6765-6774 (English) 2006 John Wiley & Sons, Inc. CODEN: JPACEC. ISSN: 0887-624X.Several reagents with their cas registry numbers 14753-51-6 and 900804-96-8 are used here. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Section cross-reference(s): 76 A series of poly(fluorene-co-alt-phenylene)s contg. various generations of dendritic oxadiazole (OXD) pendent wedges were synthesized by the Suzuki polycondensation of OXD-functionalized 1,4-dibromophenylene with 9,9-dihexylfluorene-2,7-diboronic ester. The obtained polymers possessed excellent soly. in common solvents and good thermal stability. Photophys. studies showed that the dendronized polymers appended with higher generations of OXD dendrons exhibited enhanced photoluminescence efficiencies and narrower values of the full width at half-max. This was attributed to the shielding effect induced by the bulky dendritic OXD side chains, which prevented self-quenching and suppressed the formation of aggregates/excimers. The energy transfer from the OXD dendrons to the polymer backbones was very efficient when excitation of the peripheral OXD dendrons resulted mainly in the polymer backbone emission alone. In particular, the photoluminescence emission intensities by the sensitized excitations of OXD dendrons in solid films of the polymers were all stronger than those by the direct excitations of their polymer conjugated backbones. .