研究目的
To synthesize and characterize a series of two-dimensional lanthanide coordination polymers for their magnetic and luminescence properties, and to investigate their potential as selective sensors for heavy metal ions and toxic solvents.
研究成果
The synthesized coordination polymers exhibit weak antiferromagnetic interactions and strong luminescence properties. CP2 and CP4 show high sensitivity and selectivity for Fe3+ ions and acetone through fluorescence quenching, making them potential fluorescent sensors. The quenching mechanisms involve competitive absorption and energy transfer.
研究不足
The study is limited to specific lanthanide ions (Gd, Dy, Nd, Sm) and one organic ligand. The sensors may have selectivity issues in complex mixtures, and the stability under various conditions was not extensively tested. Further optimization for real-world applications is needed.
1：Experimental Design and Method Selection:
The study involved the synthesis of four coordination polymers (CP1-CP4) using solvothermal methods with lanthanide ions and biphenyl-3,3',5,5'-tetracarboxylic acid. Structural characterization was performed using single-crystal X-ray diffraction, elemental analysis, IR spectra, powder X-ray diffraction, and thermogravimetric analysis. Magnetic properties were measured with a SQUID magnetometer, and luminescence properties were studied using fluorescence spectroscopy.
2：Sample Selection and Data Sources:
Samples were synthesized from commercially available reagents without further purification. Crystals were grown under solvothermal conditions at 160°C for 3 days.
3：List of Experimental Equipment and Materials:
Equipment included a Labsys NETZSCH TG 209 Setaram apparatus for TGA, D/Max-2500 X-ray diffractometer for PXRD, PerkinElmer analyzer for elemental analysis, Bruker Tensor 27 spectrometer for IR spectra, Quantum Design MPMS-XL7 SQUID magnetometer for magnetic measurements, and F-4600 FL for fluorescence spectra. Materials included GdCl3·6H2O, DyCl3·6H2O, NdCl3·6H2O, SmCl3·6H2O, H4BPTC, N,N-dimethylacetamide (DMA), and deionized water.
4：Experimental Procedures and Operational Workflow:
Synthesis involved mixing lanthanide salts with H4BPTC in DMA and water, heating in a Teflon-lined vessel, cooling, and washing crystals. Characterization steps included structural analysis, magnetic susceptibility measurements from 2.0-300 K, and luminescence quenching experiments with various metal ions and solvents.
5：0-300 K, and luminescence quenching experiments with various metal ions and solvents.
Data Analysis Methods:
5. Data Analysis Methods: Data were analyzed using TOPOS for topological analysis, and luminescence quenching was quantified with the Stern-Volmer equation.
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