研究目的
To explore the reactivity of ligand L toward the entire series of lanthanides and to complete the series of lanthanide complexes of L1, investigating their structural and luminescence properties.
研究成果
The study successfully synthesized and characterized a series of lanthanide coordination polymers with novel luminescence properties. The absence of ligand-to-metal energy transfer in visible-light-emitting lanthanides and the unique nonemissive behavior of the Eu-based polymer highlight the complex interplay between structural and electronic factors in determining luminescence properties. The findings contribute to the understanding of lanthanide-based materials for potential applications in luminescence and sensing.
研究不足
The study is limited by the insolubility of the coordination polymers in common solvents, which restricts solution-phase characterization. Additionally, the unique nonemissive behavior of the Eu derivative with the 9,10-anthracenylene bridge lacks a complete explanation, indicating areas for further investigation.
1：Experimental Design and Method Selection:
The study involved the synthesis of coordination polymers using ditopic phosphonic ester ligands with biphenylene and 9,10-anthracenylene bridges. The methodology included microwave-assisted synthesis for ligand preparation and slow evaporation for polymer formation.
2：Sample Selection and Data Sources:
Lanthanide nitrate salts and the synthesized ligands were used as starting materials. Single-crystal X-ray diffraction was employed for structural characterization.
3：List of Experimental Equipment and Materials:
Microwave reactor (CEM DISCOVER-SP), NMR spectrometers (Varian 400 MHz and 500 MHz), IR spectrometer (Bruker ATR IR), luminescence measurement systems (Hamamatsu C11347, Horiba Jobin-Yvon Fluorolog III), and X-ray diffractometers (STOE IPDS 2, STOE StadiVari).
4：Experimental Procedures and Operational Workflow:
Ligands were synthesized via microwave heating, and coordination polymers were formed by slow evaporation of solvent mixtures containing lanthanide salts and ligands. Products were characterized by combustion analysis, IR spectroscopy, and luminescence measurements.
5：Data Analysis Methods:
Structural data were solved using SHELXT and refined with SHELXL-2018/3. Luminescence data were analyzed using ORIGIN 2017.
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