title: Highly emissive pi-conjugated alkynylpyrene oligomers: their synthesis and photophysical properties.
abstract: 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).
authors.affiliation: Graduate School of Pharmaceutical Sciences, University of Toyama, Sugitani 2630, Toyama 930-0194, Japan.
authors.forename: Hisao
authors.initials: H
authors.lastname: Shimizu
authors.forename: Kazuhisa
authors.initials: K
authors.lastname: Fujimoto
authors.forename: Masaru
authors.initials: M
authors.lastname: Furusyo
authors.forename: Hajime
authors.initials: H
authors.lastname: Maeda
authors.forename: Yasuaki
authors.initials: Y
authors.lastname: Nanai
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Mizuno
authors.forename: Masahiko
authors.initials: M
authors.lastname: Inouye