Preparation method and application of constructed metal-organic limited domain structure based on flexible ligand
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A flexible ligand and flexible metal technology, applied in the field of supramolecular recognition, can solve the problems of less research and achieve the effects of strong adaptability, strong supramolecular interaction, and high specificity and selectivity
Inactive Publication Date: 2018-10-12
SHANDONG UNIV OF TECH
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[0004] Currently, the reported host-guest selective recognition process between metal-organic confinement materials and natural small molecules is mainly based on metal-organic confinement structures with rigid Relatively little research has been done on the role of confined structures in molecular recognition
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Embodiment 1
[0035] Embodiment 1 (synthesis of Ce-BHP)
[0036] Weigh the ligands BHP (0.067 g, 0.10 mmol), Ce(NO 3 ) 3 (0.033 g, 0.10 mmol) and KOH (0.017 g, 0.30 mmol) were dissolved in 20 mL of N,N-dimethylformamide solution, heated and stirred at 70°C for about 3 hours, and the reaction solution was cooled to room temperature Filtrate, add every 3 mL of filtrate into a test tube, seal it with tape, place it in a jar filled with ether, and seal it with vacuum grease. After one week, black blocky crystals are obtained, with a yield of 52%.
Embodiment 2
[0037] Embodiment 2 (synthesis of Ce-HHB)
[0038] Weigh the ligand HHB (0.076 g, 0.15 mmol), Ce(NO 3 ) 3 (0.033 g, 0.10 mmol) and KOH (0.017 g, 0.30 mmol) were dissolved in 20 mL of N,N-dimethylformamide solution, heated and stirred at 70°C for about 3 hours, and the reaction solution was cooled to room temperature Filtrate, add every 3 mL of filtrate into a test tube, seal it with adhesive tape, place it in a jar filled with ether, and seal it with vacuum grease. After one week, black blocky crystals are obtained, with a yield of 36%.
Embodiment 3
[0039] Embodiment 3 (synthesis of Eu-TQP)
[0040] The ligand TQP (0.039 g, 0.05 mmol) was weighed and dissolved in 6 mL of a mixed solution of methanol and chloroform (volume ratio 1:4), placed in the lower layer of the test tube, Eu(NO 3 ) 3 ·6H 2 O (0.034 g, 0.075 mmol) was dissolved in a solution of 6 mL of methanol and placed on the upper layer of the test tube, and a 1:1 mixed solution of methanol and chloroform was used as a transition layer. After standing for two weeks, yellow blocky crystals were obtained. The yield 47%.
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Abstract
The invention relates to the technical field of supramolecular recognition, and discloses a preparation method and application of a constructed metal-organic limited domain structure based on a flexible ligand. Ce3+, Eu3+ or Tb3+ which are provided with certain coordination modes in rare earth metal salt are taken as nodes, and a metal-organic clathrate compound of a flexible limited domain cavitystructure is prepared by regulating and controlling the proportion of coordination sites to metal nodes in the ligand and utilizing a poor solvent diffusion method or layering diffusion method. Flexible functional groups are introduced in the target material to strengthen the interaction effect between limited range host molecules and guest small molecules, can show adaptive ability similar to 'abreath effect' in the supramolecular interaction process, and can show excellent selective recognition on natural small molecules with similar structures and sizes. Compared with the prior art, the method has the advantages of good adaptability, high supramolecular interaction, high concentrated selectivity, convenient visual detection and the like and has a better application prospect in the fields of molecular recognition, fluorescence probes and the like.
Description
technical field [0001] The invention relates to a preparation method and application of a metal-organic confinement structure based on flexible ligands, and belongs to the technical field of supramolecular recognition. Background technique [0002] Orderly and complex life processes are constantly going on in organisms. For the highly specific recognition, reaction, transportation, regulation and other processes in organisms, the interaction between molecules constitutes the basis for their occurrence. To design a specific and efficient artificial simulation system, it is necessary to realize non-covalent intermolecular forces (electrostatic forces, hydrogen bonds, van der Waals forces, etc.) above match. Supramolecular Chemistry, which is at the intersection of multiple disciplines, is considered to be "chemistry beyond molecules", which covers more complex chemical, physical and biological properties than molecules themselves, and has certain "chemical properties" at the ...
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