研究目的
To obtain Eu(III) complexes with large quantum yields at large concentrations by taking advantage of the steric effects effected by the phosphine oxide ligand.
研究成果
Dinuclear Eu(III) complex with macrocyclic TPTO ligand 2 has a large quantum yield (? =0.54) even at the large concentration of 1×10?3 mol/l (Eu(III) ion base) in ethyl acetate. Eu(III) complex 2 is a promising candidate for some applications because it can be dissolved at large concentration in media and large photoluminescence intensity can be obtained. Macrocyclic TPTO ligand has a function as a “separator” of Eu(III) ions that prevents concentration quenching of Eu(III) complexes.
研究不足
The study focuses on the photoluminescence properties of dinuclear Eu(III) complexes with a specific ligand, and the findings may not be directly applicable to other lanthanide complexes or ligands.
1：Experimental Design and Method Selection:
Synthesis of dinuclear Eu(III) complexes with macrocyclic tetraphosphine tetraoxide ligand and investigation of their photoluminescence properties.
2：Sample Selection and Data Sources:
Eu(III) complexes 1 and 2 were synthesized and characterized.
3：List of Experimental Equipment and Materials:
Fluoromax 4 spectrofluorescence photometer, SII Technology DSC220, JNM-ECZ400 spectrometer, V-670 spectrophotometer.
4：Experimental Procedures and Operational Workflow:
Synthesis of complexes, measurement of photoluminescence and excitation spectra, determination of melting points and thermodynamic properties, measurement of absolute quantum yields, NMR spectra, and absorption spectra.
5：Data Analysis Methods:
Density functional theory (DFT) calculations for structure analysis and electronic spectra simulation.
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