Intramolecular excimer formation of diastereoisomeric model compounds of polystyrene in fluid solution. Their local molecular motion and photophysical properties

Hideyuki Itagaki, Kazuyuki Horie, Itaru Mita, Masakazu Washio, Seiichi Tagawa, Yoneho Tabata

研究成果: Article

5 引用 (Scopus)

抄録

The dynamic process of intramolecular excimer formation in diastereoisomeric oligomers [dimers: meso (m)- and racemic (r)-4,6-diphenylnonane (PS2), trimers: mm-, mr- and rr-4, 6,8-triphenylundecane (PS3), and tetramers: mmm-, mmr-, mrm-, rrm-, and rrr-4, 6,8, 10-tetraphenyltridecane (PS4)], model compounds of polystyrene, was investigated by using a picosecond pulse radiolysis technique. Monomer fluorescence of all-racemic isomers (r PS2, rr PS3, rrr PS4) and rrm PS4 decays single-exponentially, while that of other isomers decays dual-exponentially. Multicomponent fluorescence decay curves are supposed to be mainly induced by conformational changes. The results suggest that the excimer in oligostyrenes (or polystyrene) is formed mainly in meso diad. It is proved that there exists singlet energy migration in styrene trimer and tetramer systems. The conformational change in PS3 and PS4 is concluded to occur by cooperative motions in backbone chains bond such as a crankshaft transition, but not by way of independent rotation around each carbon-carbon bond of the backbone chain.

元の言語English
ページ(範囲)597-603
ページ数7
ジャーナルRadiation Physics and Chemistry
34
発行部数4
出版物ステータスPublished - 1989
外部発表Yes

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excimers
polystyrene
trimers
fluids
decay
isomers
fluorescence
carbon
picosecond pulses
radiolysis
oligomers
styrenes
monomers
dimers
curves
energy

ASJC Scopus subject areas

  • Radiation

これを引用

Intramolecular excimer formation of diastereoisomeric model compounds of polystyrene in fluid solution. Their local molecular motion and photophysical properties. / Itagaki, Hideyuki; Horie, Kazuyuki; Mita, Itaru; Washio, Masakazu; Tagawa, Seiichi; Tabata, Yoneho.

:: Radiation Physics and Chemistry, 巻 34, 番号 4, 1989, p. 597-603.

研究成果: Article

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T1 - Intramolecular excimer formation of diastereoisomeric model compounds of polystyrene in fluid solution. Their local molecular motion and photophysical properties

AU - Itagaki, Hideyuki

AU - Horie, Kazuyuki

AU - Mita, Itaru

AU - Washio, Masakazu

AU - Tagawa, Seiichi

AU - Tabata, Yoneho

PY - 1989

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