Synthesis and luminescence properties of the Pr(III), Sm(III), Eu(III), Nd(III), and Yb(III) complexes with propane-1, 3-dione derivatives

Article abstract of DOI:10.1134/S1070328411030080

The luminescence method, mass spectrometry, and elemental analysis are used to reveal that under optimal conditions (pH 5-8) Ln³⁺ ions (Ln = Pr, Sm, Eu, Nd, and Yb) with 1-(2-hydroxy-4-meth- ylphenyl)-3-(5-methyl-1-phenyl- ¹H-1,2,3-triazol-4-yl)propane-1,3-dione form complexes with the mole ratio Ln : ligand = 2 : 3. According to the IR spectral data, Ln³⁺ ions coordinate three oxygen atoms of two carbonyl groups and one hydroxyl group. In the IR spectra of the complexes, an intense band at 628.7 cm ^-1 is assigned to the Ln-O bond vibrations. The X-ray diffraction patterns of the complexes contain no lines corresponding to the ligand. The luminescence intensity of the complexes in the visible spectral range changes in the series Eu(lll)