| Metal-organic frameworks (MOFs) are a class of three dimensional network structure builting from organic ligands and metal ions through coordination bond, so it can also be called metal-organic networks or coordination polymers. In recent decades, MOFs have received tremendous attention due to their powerful attributes on structural and chemical versatility and tailorffability. The purpose of this article is to synthesize two fluorescent MOFs and apply in detection of 2,4,6-trinitrophenol and malachite green, respectively.The article includes four parts:Part one:IntroductionA brief introduction including the classification of MOFs, synthetic methods, direction of its research and application fields are given.Part two:The synthesis and characterization of bis(8-hydroxyquinoline) metal complexIn this chapter, we report a Bhq-Al complex, composed of 5,5'-methylenebis-(8-quinolinol) (Bhq) as a ligand coordinated to aluminium(lll) ions, and self-assembled into nanoparticles. The composition and structure were characterized by chemical analysis, elemental analysis, ultraviolet spectrum, infrared spectroscopy, and their fluorescence intensities were analyzed. The complex has strong fluorescence.Part three:Selective detection of 2,4,6-trinitrophenol based on a fluorescent nanoscale bis(8-hydroxyquinoline) metal complexNitro aromatic compounds are widely used in the preparation of pesticides, Pharmaceuticals, explosives, dyes, chemical fibres, and rubber products. However, because of their toxicity, carcinogenicity to living organisms, and the risk to national security, they pose serious threats to our lives. In particular, TNP is more powerful but less stable than the more commonly used explosive TNT. Furthermore, discharged as a component of industrial liquid waste, TNP can significantly pollute water and soil. Bhq-Al appears to be a very promising fluorescent probe for TNP. There exists a large absorption spectral overlap between Bhq-Al (388 nm) and TNP (370 nm). Owing to the strong absorption of TNP, the excitation light for Bhq-Al is weakened. The results show that a good linear relationship between analytical signal of (Io/I)-1 and TNP concentration was observed from 0.5 to 90.9 ?mol/L, with a limit of detection of 0.28 ?mol/L at a signal-to-noise ratio of 3. The Ksv value was calculated to be 5.08*104 L/mol with a correlation coefficient R2 of 0.9914. To evaluate the sensing specificity of Bhq-Al for TNP, the sensing for TNT,2,4-DNT,2,6-DNT,4-nitrotoluene (4-NT), 1,3-dinitrobenzene (DNB), nitrobenzene (NB), methylbenzene (MB), aniline (AN), phenol, benzene, benzoic acid (BA), and p-nitrophenol (PN) were also investigated. Notably, the quenching of TNP was found to be much higher than those of other researched compounds. The Bhq-Al exhibits the ability to sense the nitro explosive TNP via a fluorescence quenching mechanism with high sensitivity and high selectivity.Part four:Selective detection of malachite green based on a lanthanide-MOFsMG has been used commonly worldwide in aquaculture as early as the 1930s and is considered by many in the food industry as an effective antifungal agent. It has been used for the treatment of parasitic, fungal and protozoan diseases in fish. Long-term surfeit use of MG was found to be toxic to the liver, cause anaemia and abnormalities in the thyroid, and affect the foetal development of the experimental animals. MG has been banned more widely from aquaculture. A lanthanide MOF was prepared and used for detecting MG. There exists a large emission spectral overlap between Eu-Yb-BTC (616 nm) and absorption spectral MG (618 nm). Based on inner filter effect (IFE), a sensitive method for the determination of the MG was developed. |
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