研究目的
To explore the metal ions-controlled syntheses of coordination polymers (CPs) using a less-investigated oxalamide N,N′-bis(4-phthalic acid) (H4L) ligand, and to understand the structural diversities, magnetic properties, and luminescence of the resulting CPs.
研究成果
The research successfully synthesized five new CPs with diverse structures using a metal ions-controlled strategy. Key findings include the observation of four new coordination modes for the H4L ligand, varied magnetic properties (antiferromagnetic for 2 and ferromagnetic for 3), and strong luminescence in 1, 4, and 5. The study highlights the effectiveness of oxalamide-based ligands in fabricating CPs with tailored architectures and properties, suggesting future work could explore more metal ions or functional applications.
研究不足
The study is limited to specific metal ions and the H4L ligand; variations in other factors like pH or additional ligands were not explored. The magnetic and luminescent properties are specific to the synthesized CPs and may not generalize to other systems. Potential optimizations include investigating a broader range of metal ions or solvent conditions.
1：Experimental Design and Method Selection:
The study employed a metal ions-controlled strategy with fixed temperature and solvent ratios to synthesize five new CPs using solvothermal methods. Theoretical models for magnetic properties analysis were based on equations for magnetic susceptibility.
2：Sample Selection and Data Sources:
Samples included synthesized CPs [ZnL0.5(H2O)2]n (1), [CoL0.5(H2O)2]n (2), [Mn(H2L)(H2O)2]n (3), [Ca(H2L)(H2O)2]n (4), and [Ba(H2L)(H2O)2]n (5), with H4L ligand synthesized from literature. Data were collected from experimental measurements.
3：5(H2O)2]n (1), [CoL5(H2O)2]n (2), [Mn(H2L)(H2O)2]n (3), [Ca(H2L)(H2O)2]n (4), and [Ba(H2L)(H2O)2]n (5), with H4L ligand synthesized from literature. Data were collected from experimental measurements.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included EQUINOX-55 FT-IR spectrometer, PerkinElmer 2400C elemental analyzer, Netzsch TG209F3 TGA, Bruker D8 ADVANCE PXRD, Hitachi F-4500 fluorescence spectrophotometer, Quantum Design MPMS-XL-7 SQUID magnetometer, and Bruker SMART APEX II CCD detector for X-ray diffraction. Materials were commercially purchased reagents and solvents.
4：Experimental Procedures and Operational Workflow:
CPs were synthesized by heating mixtures of metal salts and H4L in specific solvents at 105°C for 3 days, followed by cooling. Procedures included IR spectroscopy, elemental analysis, TGA, PXRD, luminescence measurements, and magnetic susceptibility measurements.
5：Data Analysis Methods:
Data were analyzed using SHELXL-2014 for crystal structure refinement, Topos for topology calculation, and specific equations for magnetic property fitting.
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