Synthesis and Optical Properties of Poly(2-substituted-9,9-dipropargylfluorene)s

Abstract

Poly(9,9-dipropargylfluorene) and poly(2-substituted-9,9-dipropargylfluorene)s (X = Ac, Br, NO₂) were prepared by the palladium-catalyzed dehydrocoupling polymerization reaction of 2-substituted-9,9-dipropargylfluorenes. The thermal and optical properties of the polymers have been investigated. The diacetylenic functions in polymer main chain started to be thermally crosslinked in the range of 143–177°C. The photoluminescence spectra of polymers were in the range of 407–410 nm, which are corresponded to the photon energy of 3.05–3.03 eV. The quantum yield of poly(DPF-Br) is the highest value (55.84%), which means probably the contribution of electron-donating character of Bromine at the 2-position of fluorene.

Keywords:

• cross-linking
• dehydrocoupling
• diacetylenic
• fluorene derivative
• photoluminescence, quantum yield

Acknowledgments

This work was supported by grant No. (R12-2002-055-01003-0) from the Basic Research Program of the Korea Science & Engineering Foundation.