Hyperbranched Poly(aryleneethynylene)s: Synthesis, Thermal Stability and Optical Properties

✍ Scribed by Han Peng; Jacky W. Y. Lam; Ben Zhong Tang

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 114 KB
• Volume: 26
• Category: Article
• ISSN: 1022-1336
• DOI: 10.1002/marc.200500033

✦ Synopsis

Abstract

Summary: Alkyne copolycyclomerizations of aromatic diynes 2,7‐bis(4‐ethynylphenylethynyl)‐9,9‐dihexylfluorene (I) and 1,4‐bis(4‐ethynylphenylethynyl)benzene (II) with an aliphatic monoyne 1‐dodecyne (A) were effected by CpCo(CO)~2~__hv__ in THF, producing hyperbranched poly(aryleneethynylene)s (1 and 2) of high molecular weights ($\overline M _{\rm w}$ up to 4.4 × 10^4^ Da) in high isolation yields (up to 97%). The polymers possessed outstanding thermal stability and emitted strong deep blue light of ≈400 nm when their solutions were photoexcited. The polymers effectively limited the light of a 532 nm laser, with the performance of 2 being better than that of C~60~, a well‐known optical limiter, under similar linear transmittance.

The structure of hyperbranched poly(aryleneethynylene).

imageThe structure of hyperbranched poly(aryleneethynylene).