A cationic cadmium-based metal-organic framework crystalline material and its preparation method and application
A cationic, organic framework technology, applied in the direction of luminescent materials, analytical materials, material excitation analysis, etc., can solve the problems of iodine burden and damage, and achieve the effect of low cost, high repeatability and high yield
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Embodiment 1
[0023] The preparation method of embodiment 1 cationic metal-organic framework material
[0024] Weigh 19mg (0.04mmol) organic ligand 1,1'-bis(4-carboxyphenyl)-(4,4'-bipyridinium)dichloride (abbreviated as H 2 bcbp·2Cl) and 39mg (0.1mmol) of cadmium iodide in a polytetrafluoroethylene liner, add 2ml of acetonitrile and 2mL of deionized water to the mixture, and mix well by ultrasonication for 30 minutes, then place the polytetrafluoroethylene liner Tighten it in a stainless steel reaction kettle jacket, put it in a constant temperature oven at 140°C to react for 6 days, take it out and let it cool down to room temperature naturally, open the polytetrafluoroethylene liner to get a yellow block transparent crystal. Rinse the crystal with deionized water, filter and collect the crystal, and dry at room temperature to obtain a cationic metal-organic framework crystalline material based on the transition metal cadmium, whose molecular formula is {[Cd(bcbp) 2 ] n · nCdI 4}.
Embodiment 2
[0025] Example 2 Structural characterization of cationic metal-organic framework materials
[0026] The crystal structure of the cationic metal-organic framework was obtained by analyzing the X-ray single crystal diffraction data. Single crystal test results show that the target material crystallizes in the monoclinic system P2 1 / c space group. The asymmetric unit contains a cadmium ion, two bcbp ligand molecules, and a tetraiodide cadmium complex ion ( figure 1 a). A cadmium ion is linked by four adjacent bcbp ligand molecules to form a positively charged cationic metal-organic framework ( figure 1 b). The sample purity and air stability of the cationic MOFs were characterized by X-ray powder diffraction ( figure 2 ).
Embodiment 3
[0027] Embodiment 3 Characterization of thermal stability of cationic metal-organic framework materials
[0028] The characterization of the thermal stability of cationic metal-organic framework materials is to use a thermogravimetric analyzer to heat the sample to 800 ° C in a nitrogen environment, and judge its stable temperature range through the weight loss during the heating process of the sample. Such as image 3 As shown, the target material gradually loses solvent molecules before 105 °C, while the framework structure of the target material remains stable. The main frame structure of the target material starts to collapse after 350 °C.
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