Synthesis, Structure and Luminescent Property of Heterometallic Ln(III)–K Complexes with 4,4,4–trifluoro–1–phenyl–1,3–butanedione Ligand

Abstract

Three heterometallic β–diketonate complexes, [Ln(TFPB)₄K] (Ln = Eu (1), Lu (2), Y (3); TFPB = 4,4,4–trifluoro–1–phenyl–1,3–butanedione), were synthesized and structurally characterized using ESI–MS, IR and ¹H – NMR spectroscopies. X–ray crystallographic analysis demonstrates that (1) exists as dimer form in which the Eu³⁺ ion was coordinated by four TFPB ligands. The alkali metal K in the complex is stabilized  by electrostatic interactions with O and F atoms of TFPB ligands. The luminescence properties of (1) were determined using UV–Vis and photoluminescence methods. The results indicate that under 360 nm excitation, the Eu(III) complex emits strong red fluorescence at 616 nm, corresponding to the transition ⁵D₀ ® ⁷F₂.