Excited-state dynamics of conjugated polycarbosilane oligomers with branched dimethyl or diphenyl group

I. W. Hwang, N. W. Song, D. Kim, Y. T. Park, Y. R. Kim

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19 Citations (Scopus)


Dimethyl or diphenyl branched conjugated polycarbosilane oligomers in solutions, including poly[[1,4-bis(thiophenyl)buta-1, 3-diyne]-alt-(dimethylsilane)], poly-[[1,4-bis(thiophenyl)buta-1,3-diyne]-alt- (diphenylsilane)], poly[[1,4-bis(phenyl)buta-1, 3-diyne]-alt-(dimethylsilane)], and poly[[1,4-bis(phenyl)buta-1,3-diyne]-alt- (diphenylsilane)], were investigated by steady-state and picosecond time-resolved spectroscopies to elucidate the effect of silicon-atom introduction into the π-conjugated copolymer backbone and the substitution of the aromatic phenyl group on the silicon atom. The introduction of silicon atoms into π-conjugated copolymer backbones induces slow decay emission components with lifetimes of about 450 ps in addition to π-π* local excited-state relaxations in the time-resolved fluorescence decay profiles. The diphenyls, which are branched in the silicon atoms, bring about broad, structureless emission bands in the low-frequency region of the steady-state fluorescence spectra. However, such broad bands do not occur in the case of dimethyl branched conjugated polycarbosilane oligomers. The time-resolved and solvent-dependent studies of these bands imply that the excited-state dynamics of diphenyl branched conjugated polycarbosilane oligomers can be related to an intramolecular charge-transfer dynamics through an inductive and (d-p) π-conjugation effect between the π-conjugated backbone and the branched phenyl ring.

Original languageEnglish
Pages (from-to)2901-2908
Number of pages8
JournalJournal of Polymer Science, Part B: Polymer Physics
Issue number20
Publication statusPublished - 1999 Oct 15

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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