Effects of bulky substituents on intramolecular exciplex formation in 1-(1-pyrenyl)-3-N,N-dimethylaminophenylpropane derivatives

Shin ichiro Imabayashi; Noboru Kitamura; Shigeo Tazuke

doi:10.1016/0009-2614(88)80126-X

Effects of bulky substituents on intramolecular exciplex formation in 1-(1-pyrenyl)-3-N,N-dimethylaminophenylpropane derivatives

Shin ichiro Imabayashi, Noboru Kitamura, Shigeo Tazuke

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

Intramolecular exciplex formation in 1-(1-pyrenyl)-3-N,N-dimethylaminophenylpropane (I) and its derivatives with one (II) and two (III) ester substituent(s) at the 2-position of the propane linkage has been studied in isooctane. Introduction of the two bulky ester groups (i.e. III) is characterized by a large decrease in the quantum yield of exciplex formation as well as by the appearance of two rise components of exciplex emission (4.2 and 24.1 ns at 35°C). Extremely slow rise time and low quantum yield of exciplex emission in III are explained by steric hindrance of the bulky ester groups for the structural change from (tt) to (tg^±) and from (tg^±) to (g^±g^∓) conformers in the excited singlet state.

Original language	English
Pages (from-to)	23-26
Number of pages	4
Journal	Chemical Physics Letters
Volume	153
Issue number	1
DOIs	https://doi.org/10.1016/0009-2614(88)80126-X
Publication status	Published - 1988 Dec 2
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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10.1016/0009-2614(88)80126-X

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abstract = "Intramolecular exciplex formation in 1-(1-pyrenyl)-3-N,N-dimethylaminophenylpropane (I) and its derivatives with one (II) and two (III) ester substituent(s) at the 2-position of the propane linkage has been studied in isooctane. Introduction of the two bulky ester groups (i.e. III) is characterized by a large decrease in the quantum yield of exciplex formation as well as by the appearance of two rise components of exciplex emission (4.2 and 24.1 ns at 35°C). Extremely slow rise time and low quantum yield of exciplex emission in III are explained by steric hindrance of the bulky ester groups for the structural change from (tt) to (tg±) and from (tg±) to (g±g∓) conformers in the excited singlet state.",

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AU - Imabayashi, Shin ichiro

AU - Kitamura, Noboru

AU - Tazuke, Shigeo

PY - 1988/12/2

Y1 - 1988/12/2

N2 - Intramolecular exciplex formation in 1-(1-pyrenyl)-3-N,N-dimethylaminophenylpropane (I) and its derivatives with one (II) and two (III) ester substituent(s) at the 2-position of the propane linkage has been studied in isooctane. Introduction of the two bulky ester groups (i.e. III) is characterized by a large decrease in the quantum yield of exciplex formation as well as by the appearance of two rise components of exciplex emission (4.2 and 24.1 ns at 35°C). Extremely slow rise time and low quantum yield of exciplex emission in III are explained by steric hindrance of the bulky ester groups for the structural change from (tt) to (tg±) and from (tg±) to (g±g∓) conformers in the excited singlet state.

AB - Intramolecular exciplex formation in 1-(1-pyrenyl)-3-N,N-dimethylaminophenylpropane (I) and its derivatives with one (II) and two (III) ester substituent(s) at the 2-position of the propane linkage has been studied in isooctane. Introduction of the two bulky ester groups (i.e. III) is characterized by a large decrease in the quantum yield of exciplex formation as well as by the appearance of two rise components of exciplex emission (4.2 and 24.1 ns at 35°C). Extremely slow rise time and low quantum yield of exciplex emission in III are explained by steric hindrance of the bulky ester groups for the structural change from (tt) to (tg±) and from (tg±) to (g±g∓) conformers in the excited singlet state.

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Effects of bulky substituents on intramolecular exciplex formation in 1-(1-pyrenyl)-3-N,N-dimethylaminophenylpropane derivatives

Abstract

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