Synthesis and characterization of new luminescent 1,10-phenanthroline- and pyridine-containing π-conjugated polymers. Their optical response to protic acid, Mn+, and solvents

Takuma Yasuda, Takakazu Yamamoto

Research output: Contribution to journalArticle

96 Citations (Scopus)

Abstract

New π-conjugated polymers comprised of alternating 1,10-phenanthroline/1,4-didodecyl-oxybenzene, 1,10-phenanthroline/9.9-dioctylfluorene, or pyridine/1,4-dialkoxybenzene units were prepared by palladium(0)-catalyzed coupling reaction in 84-98% yields. The derived polymers gave Mn of 5400-8800 in GPC analysis, and they possessed good solubility in organic solvents and high thermal stability. Electrochemical reduction (or n-doping) of the polymers proceeded with peaks in the range -2.3 to -2.6 V vs Ag+/Ag. The polymers were highly photoluminescent, and strong blue emission with the peak in the range 412-434 nm was observed in solutions. The emission peak as well as the UV-vis absorption peak of the polymer was influenced by the solvent polarity, protonation, and formation of metal complexes. When the polymers were protonated with trifluoroacetic acid, a large red-shift (ca. 40-60 nm) of the absorption peak was observed. The photoluminescent properties of the polymers were tuned by coordination of the polymer with metal ions. Polymers with long side chains formed an ordered structure in the solid state as judged from their XRD patterns.

Original languageEnglish
Pages (from-to)7513-7519
Number of pages7
JournalMacromolecules
Volume36
Issue number20
DOIs
Publication statusPublished - Oct 7 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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