Highly emissive pi-conjugated alkynylpyrene oligomers: their synthesis and photophysical properties.
We newly prepared para- and meta-linked alkynylpyrene oligomers and examined their photophysical properties. Oligomerization of monomeric building blocks was performed by CuI-promoted oxidative coupling reaction. The resulting oligomers mainly consist of 2-mer to 6-mer that were assigned on the basis of MALDI-TOF mass spectra, and the 2-mer, 3-mer, and 4-mer were isolated and fully characterized. From their absorption and fluorescence spectra, the para-linked oligomers were found to be somewhat pi-conjugated compared with meta-linked ones, and the fluorescence quantum yields decreased with increasing oligomer length (Phif = 0.79-0.55).
Shimizu
Hisao
H
Graduate School of Pharmaceutical Sciences, University of Toyama, Sugitani 2630, Toyama 930-0194, Japan.
Fujimoto
Kazuhisa
K
Furusyo
Masaru
M
Maeda
Hajime
H
Nanai
Yasuaki
Y
Mizuno
Kazuhiko
K
Inouye
Masahiko
M