Add time:07/24/2019         Source:sciencedirect.com

Ln3+ complexes with the phosphonate ligands: diethyl(2-oxopropyl) phosphonate [CH3C(O)CH2P(O)(OC2H5)2] (OPP) and diethyl (2-oxo-2-phenylethyl) phosphonate [C6H5C(O)CH2P(O)(OC2H5)2] (DEPP) were synthesized and characterized. Complexation studies and spectral characterizations are performed. Based on the Nd3+ absorption spectra, using computer-assisted target factor analysis, the stability constants of Nd-OPP complexes in solution were determined to be log β11 = 2.8 ± 0.4 and log β12 = 5.0 ± 0.7. Luminescence intensities, lifetimes, τ, and quantum yields, Φ, of the Eu3+ and Tb3+ ions in the complexes were measured. The most intense luminescence was observed in the case of the Tb/DEPP system. Emission enhancements were observed for Tb3+ and Eu3+ complexes in acetonitrile solutions, which occurred as a result of sensitized luminescence. These observed luminescence intensities were over two orders of magnitude larger than those for the uncomplexed Ln(III) ions.The complexes of Ln/L/NO3, obtained in oil forms from ethanol at room temperature, were characterized by elemental analysis, IR spectroscopy, and luminescence lifetime measurements. The composition of the complexes studied is suggested to be LnL2(NO3)3, with monodentate coordination by the phosphoryl group.

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