Hyperbranched Poly(phenylenesilolene)s: Synthesis, Thermal Stability, Electronic Conjugation, Optical Power Limiting, and Cooling-Enhanced Light Emission

By Junwu Chen, Han Peng, C. Law, Yuping Dong, J. Lam, Ian D. Williams, Boxin Tang. 2003

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Silole-containing hyperbranched polyphenylenes (1) are synthesized, which exhibit high thermal stability, extended electronic conjugation, excellent optical power limiting performance, and novel cooling-enhanced photoluminescence. The homopolycyclotrimerization of 1,1-diethynyl-2,3,4,5-tetraphenylsilole (2) and its copolycyclotrimerizations with 1-octyne catalyzed by TaCl5−Ph4Sn proceed smoothly at room temperature and produce completely soluble polymers in high yields (up to ∼85%). The molecular structures of 1 are characterized by spectroscopic analyses. The thermal stability of 1 is evaluated by thermogravimetric analyses, which detect virtually no weight losses when the polymers are heated to ∼300 °C. The hyperbranched polyphenylenes are electronically conjugated, as suggested by their strong absorption in the visible spectral region (λmax ∼ 520 nm). Because of this extended electronic conjugation, polymers 1 are nonlinear optically active and strongly attenuate the optical power of intense laser puls...

Subfields: Biomedical Engineering, Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/9f2466a240a600026d45ea5689c57ff4016e011f