[Ln4] complexes based on 8-hydroxylquinoline-schiff base: Synthesis, crystal structure and near-infrared emission.

In this article, six rare earth complexes based on 8-hydroxylquinoline-schiff base (HL = 5-(2-furanimino)-8-hydroxylquinoline) were synthesized and characterized. Notably, complex 3 emits characteristic near-infrared luminescence of the corresponding Er3+ ions when excited by ultraviolet spectrum of 350 nm, which demonstrates the efficient energy transfer from the excited triplet states of the ligands to the central Er3+ ions. [Display omitted] Five lanthanide-containing complexes, featured with the structural formula of [Ln 4 (L 1) 4 (L) 6 (μ 3 -OH) 2 ]·m(CH 3 CN) and a related binuclear Yb-based complex, were synthesized and structurally characterized (HL = 5-(2-furanimino)-8-hydroxylquinoline; HL 1 represents for β -diketone ligand). The solid-state near-infrared fluorescence was also tested. Complex 3 emits characteristic near-infrared luminescence of the corresponding Er3+ ions when excited by ultraviolet spectrum of 350 nm, which demonstrates the efficient energy transfer from the excited triplet states of the ligands to the central Er3+ ions. [ABSTRACT FROM AUTHOR]