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

Shinichiro Imabayashi, Noboru Kitamura, Shigeo Tazuke

Research output: Contribution to journalArticle

3 Citations (Scopus)


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 languageEnglish
Pages (from-to)23-26
Number of pages4
JournalChemical Physics Letters
Issue number1
Publication statusPublished - 1988 Dec 2
Externally publishedYes


ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Surfaces and Interfaces

Cite this