研究目的
To explore the influence of different aromatic dicarboxylate ligands on the final structures and properties of ternary Cd(II) MOFs and to investigate their application as dual-responsive luminescent sensors for toxic metal ions in water.
研究成果
Two new luminescent Cd-MOFs based on L, H2atpa/H2tbta ligands were successfully synthesized and characterized. Both MOFs exhibit highly sensitive towards detection of Cu2+ and Cr2O7 2- with 1, Hg2+ and Cr2O7 2- with 2, making them promising candidates as dual-responsive luminescence sensors for sensitization metal ions.
研究不足
The study is limited to the detection of specific metal ions (Cu2+, Hg2+, and Cr2O7 2-) in aqueous solutions. The mechanisms of luminescence quenching are not fully elucidated.
1：Experimental Design and Method Selection
Hydrothermal synthesis was employed to synthesize two new Cd(II) MOFs using different aromatic dicarboxylate ligands. The structures were characterized by IR spectroscopy, elemental analysis, and single-crystal X-ray diffraction.
2：Sample Selection and Data Sources
The samples were synthesized from Cd(OAc)2·2H2O, the ligand L, and either H2atpa or H2tbta under hydrothermal conditions.
3：List of Experimental Equipment and Materials
Perkin-Elmer 240C Elemental Analyzer, Avatar 360 (Nicolet) spectrophotometer, Rigaku D/Max-2500PC diffractometer, Netzsch STA449 F1 thermogravimetric analyzer, Edinburgh FS5 fluorescence spectrophotometer, UV-Vis spectrophotometer (Puxi Instrument, T9).
4：Experimental Procedures and Operational Workflow
The mixtures were placed in Teflon-lined high-pressure containers and heated at 140 °C for 72 h, then cooled to room temperature. The crystals obtained were characterized by various spectroscopic and diffraction techniques.
5：Data Analysis Methods
The luminescent properties were analyzed using fluorescence spectrophotometry. The quenching constants and detection limits were calculated using the Stern-Volmer equation.
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Perkin-Elmer 240C Elemental Analyzer
240C
Perkin-Elmer
Elemental analysis (C, H, and N)
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Rigaku D/Max-2500PC diffractometer
D/Max-2500PC
Rigaku
Powder X-ray diffraction (PXRD) investigations
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Edinburgh FS5 fluorescence spectrophotometer
FS5
Edinburgh
Solid state luminescence excitation and emission spectra measurement
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Avatar 360 spectrophotometer
360
Nicolet
FT-IR data collection
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Netzsch STA449 F1 thermogravimetric analyzer
STA449 F1
Netzsch
Thermogravimetric analyses (TGA)
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UV-Vis spectrophotometer
T9
Puxi Instrument
Solid-state UV-Vis diffuse reflectance spectroscopy
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