研究目的
To investigate the structural diversity and multi-responsive luminescent sensing capabilities of Cd(II)-organic frameworks fabricated by a N-rich ligand and flexible dicarboxylates for toxic anions and ethylenediamine.
研究成果
The study successfully synthesized three Cd(II)-organic frameworks with versatile structures, demonstrating their potential as chemosensors for toxic anions and ethylenediamine. Complex 1 showed multifunctional sensing capabilities, while complexes 2 and 3 were selective for Cr2O7 2- anion. The structural diversity was achieved by varying the dicarboxylate ligands, highlighting the importance of ligand choice in designing MOFs with desired properties.
研究不足
The study focuses on the luminescent sensing properties of the synthesized complexes towards specific anions and ethylenediamine. The potential for broader applications or sensing of other substances was not explored. Additionally, the mechanisms of fluorescence quenching and enhancement were not fully elucidated.
1：Experimental Design and Method Selection:
The study involved the synthesis of three Cd(II)-organic frameworks under solvothermal conditions using a N-rich ligand and different aliphatic dicarboxylate ligands. The structures were characterized by single-crystal X-ray diffraction.
2：Sample Selection and Data Sources:
The samples were synthesized from mixtures of the N-rich ligand, dicarboxylate ligands, and Cd(NO3)2·4H2O in component solvents.
3：List of Experimental Equipment and Materials:
A Perkin-Elmer 240 C analyzer for elemental analysis, WQF-510A FT-IR spectrometer for IR spectra, Rigaku Miniflex 600 for PXRD measurements, and Perkin-Elmer STA-6000 standard TG-DTA analyzer for thermogravimetric analyses.
4：Experimental Procedures and Operational Workflow:
The synthesis involved heating mixtures in Teflon-lined stainless-steel reactors, followed by cooling to obtain crystals. Fluorescent sensing was performed by soaking ground samples in DMF/DMA solutions and measuring fluorescence intensities upon addition of various anions and organic molecules.
5：Data Analysis Methods:
Fluorescence quenching and enhancement effects were analyzed using the Stern–Volmer equation to determine detection limits and quenching constants.
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