Structure and Luminescent Property of Y(III) and Eu(III) Complexes Containing Tris(β–Diketonate) for Singlet Oxygen Detection

The complexes of Y(III) and Eu(III) rare earth elements with 2-naphthoyltrifluoroacetonate (TFNB) as ligand and 1-(anthracen-9-yl)-N-(pyridine-2-ylmethyl)methanamine (AnPy) as auxiliary ligand were synthesized. The structure of the [Y(TFNB)3AnPy] (M1) complex was determined by infrared spectroscopy and nuclear magnetic resonance spectroscopy. The structure and luminescent property of the [Eu(TFNB)3AnPy] (M2) complex were investigated using infrared spectroscopy, absorption spectroscopy and photoluminescence spectroscopy. The results showed that Y(III) and Eu(III) ions are coordinated to six O atoms of three TFNB ligands and two N atoms of AnPy ligand. The Eu(III) complex strongly absorb in the range of 220 to 400 nm but is poorly emissive. The M2 complex, upon reaction with 1O2, forms the M3 complex, which has a luminescence intensity about 8 times stronger than that of M2.