SEARCH

SEARCH BY CITATION

Keywords:

  • aggregation;
  • boron;
  • fluorophores;
  • ketoiminates;
  • luminescence

Abstract

A series of boron ketoiminate derivatives that exhibited clear aggregation-induced emission (AIE) characteristics (in THF: ΦPL≤0.01; in the solid state: ΦPL=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[BOND]nitrogen (B[BOND]N) bond. Furthermore, the optical properties were controllable by steric hindrance of the substituted groups on the nitrogen atom.