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Synthesis of Spirobifluorene-alt-Carbazole Copolymers with Oxadiazole Pendants and their Thermal, Electrochemical, and Photoluminescent Properties

✍ Scribed by Kai Zhang; Yang Zou; Xichen Xu; Shaolong Gong; Chuluo Yang; Jingui Qin

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
315 KB
Volume
29
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

Two new carbazole derivatives with the oxadiazole moiety substituted at the 9 position of carbazole have been facilely synthesized by an aromatic nucleophilic substitution reaction of arylamine and fluoroarenes. Alternating copolymers with spirobifluorene were then prepared by a Suzuki coupling reaction. Spirobifluorene units together with the bulky oxadiazole pendant significantly enhance the morphological stability of the copolymers. An increased π‐electron delocalization in P2 with 2,7‐coupling of carbazole results in a decrease of absorption and phosphorescence emission energies as compared to P1 with 3,6‐coupling of the carbazole. The bandgaps and energy levels of the polymers can be tuned by different coupling positions between carbazole and the spirobifluorene moieties.

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