研究目的
To design and synthesize a dinuclear alkoxo bridged cobalt(III) Schiff base complex that mimics phosphatase enzyme activity and acts as a photocatalyst for degrading organic dye contaminants like methylene blue.
研究成果
The synthesized dinuclear cobalt(III) complex effectively mimics phosphatase enzyme activity with a turnover number of ~1.4 s-1 and serves as an efficient photocatalyst for degrading methylene blue under visible light, achieving up to 82% degradation. It demonstrates multifunctional potential in bioanalytical and environmental applications, with structural integrity maintained post-reaction.
研究不足
The study is limited to specific ligands and metal complex; generalizability to other systems may require further investigation. Photocatalytic efficiency is moderate (up to 82% degradation), and the complex's stability under various conditions was not extensively tested. The mechanistic insights are based on computational models and may need experimental validation.
1：Experimental Design and Method Selection:
The study involved synthesizing a dinuclear cobalt(III) complex using Schiff base ligands, characterized by elemental analysis, IR, UV-Vis spectroscopy, X-ray crystallography, and DFT calculations. Methods included kinetic studies for phosphatase mimicking activity and photocatalytic degradation experiments under visible light irradiation.
2：Sample Selection and Data Sources:
The complex was synthesized from cobalt(II) acetate tetrahydrate, 5-bromosalicyldehyde, 2-amino-1-butanol, and sodium azide in acetonitrile-methanol medium. Substrates included 4-nitrophenylphosphate (4-NPP) for hydrolysis studies and methylene blue (MB) for photocatalytic degradation.
3：List of Experimental Equipment and Materials:
Equipment included Perkin-Elmer 240C elemental analyzer, PerkinElmer Spectrum Two FTIR spectrophotometer, JASCO V-630 UV-Vis spectrophotometer, Waters QTOF Micro YA263 mass analyzer, STOE IPDS 2T diffractometer, and computational tools like GAUSSIAN-09 and Crystal Explorer. Materials were purchased from Sigma-Aldrich (Merck, India).
4：Experimental Procedures and Operational Workflow:
Synthesis involved refluxing precursors, adding cobalt salt and azide, crystallization, and characterization. Kinetic measurements monitored 4-nitrophenolate formation at 425 nm. Photocatalytic degradation involved irradiating MB solutions with the complex, sampling at intervals, and measuring absorbance at ~600 nm.
5：Data Analysis Methods:
Data were analyzed using Michaelis-Menten kinetics, Lineweaver-Burk, Hanes, and Eadie-Hofstee plots for kinetic parameters. DFT calculations at M06-2X/def2-TZVP level with Grimme's dispersion correction and NCI plot index were used for supramolecular interaction analysis.
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