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

I. W. Hwang, N. W. Song, Dongho Kim, Y. T. Park, Yong Rok Kim

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

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
Volume37
Issue number20
DOIs
Publication statusPublished - 1999 Oct 15

Fingerprint

polycarbosilanes
Silicon
oligomers
Oligomers
Excited states
Atoms
silicon
excitation
atoms
copolymers
Copolymers
Fluorescence
fluorescence
decay
conjugation
Charge transfer
Substitution reactions
charge transfer
Spectroscopy
substitutes

All Science Journal Classification (ASJC) codes

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

Cite this

@article{68f1362177f84966ad97e14f4e14ec86,
title = "Excited-state dynamics of conjugated polycarbosilane oligomers with branched dimethyl or diphenyl group",
abstract = "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.",
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Excited-state dynamics of conjugated polycarbosilane oligomers with branched dimethyl or diphenyl group. / Hwang, I. W.; Song, N. W.; Kim, Dongho; Park, Y. T.; Kim, Yong Rok.

In: Journal of Polymer Science, Part B: Polymer Physics, Vol. 37, No. 20, 15.10.1999, p. 2901-2908.

Research output: Contribution to journalArticle

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T1 - Excited-state dynamics of conjugated polycarbosilane oligomers with branched dimethyl or diphenyl group

AU - Hwang, I. W.

AU - Song, N. W.

AU - Kim, Dongho

AU - Park, Y. T.

AU - Kim, Yong Rok

PY - 1999/10/15

Y1 - 1999/10/15

N2 - 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.

AB - 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.

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