Synthesis and Properties of Polyacetylenes Connecting Carbazole at the 2- and 3-Positions: Effect of Polymerization Catalysts and Substitution Positions on the Optoelectronic Properties

✍ Scribed by Fumio Sanda; Ritsuya Kawasaki; Masashi Shiotsuki; Tetsuya Takashima; Akihiko Fujii; Masanori Ozaki; Toshio Masuda

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 236 KB
• Volume: 208
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200600423

✦ Synopsis

Abstract

The new carbazole‐containing acetylene monomers, 2‐ethynyl‐9‐tert‐butoxycarbonylcarbazole (1) and 3‐ethynyl‐9‐tert‐butoxycarbonylcarbazole (2) were synthesized and polymerized with Rh^+^(nbd)[η^6^–C~6~H~5~B^−^(C~6~H~5~)~3~], [(nbd)RhCl]~2~–Et~3~N, [(nbd)RhCl]~2~–KN(SiMe~3~)~2~, and WCl~6~–Ph~4~Sn catalysts. The corresponding polyacetylenes with number‐average molecular weights ranging from 23 000 to 185 000 were obtained in 80%‐quantitative yields, except for the polymerization of 1 with W catalyst. Rh‐based poly(1) showed UV‐Vis absorption in the longer wavelength region than Rh‐based poly(2). W‐based poly(2) showed an absorption band edge at a wavelength longer than the Rh‐based polymer. W‐based poly(2) emitted fluorescence at 375 nm upon excitation at 291 nm, while the Rh‐based compound emitted almost no fluorescence. The polymers exhibited new absorption around 360–600 nm based on electrochemically doped species by application of an external voltage.

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