Highly emissive boron ketoiminate derivatives as a new class of aggregation-induced emission fluorophores.
A series of boron ketoiminate derivatives that exhibited clear aggregation-induced emission (AIE) characteristics (in THF: Φ(PL)≤0.01; in the solid state: Φ(PL)=0.30-0.76) were prepared by the reactions of 1,3-enaminoketone derivatives with boron trifluoride-diethyl etherate. The structures and optical properties were investigated by UV-visible spectroscopy, photoluminescent (PL) spectroscopy, and X-ray single-crystal measurements. These results indicate that the AIE characteristics were derived from molecular motions of the boron-chelating rings with a boron-nitrogen (B-N) bond. Furthermore, the optical properties were controllable by steric hindrance of the substituted groups on the nitrogen atom.
Department of Polymer Chemistry, Kyoto University, Katsura, Kyoto 615-8510, Japan.
Ryousuke
R
Yoshii
Atsushi
A
Nagai
Kazuo
K
Tanaka
Yoshiki
Y
Chujo
D001896:Boron Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D005456:Fluorescent Dyes / Q000138:chemical synthesis* / Q000737:chemistry; D007097:Imines / Q000138:chemical synthesis* / Q000737:chemistry; D007659:Ketones / Q000138:chemical synthesis* / Q000737:chemistry; D015394:Molecular Structure
D001896:Boron Compounds; D005456:Fluorescent Dyes; D007097:Imines; D007659:Ketones