Multifunctional rare earth metal-organic framework and preparation method thereof

Abstract

The invention relates to a multifunctional rare earth metal-organic framework of which the chemical formula is {[Ln(FDA)1.5(DMF)].DMF}n, wherein Ln is Eu or Tb, the FDA is furyl-2,5-dicarboxylic acid, and the DMF is N,N-dimethylformamide; and the rare earth metal framework structure has an Eu<3+> / Tb<3+> ion in a coordination environment, and forms a three-dimensional framework structure containing one-dimensional honeycomb channels. The preparation method comprises the following steps: by using europium nitrate hexahydrate or terbium nitrate hexahydrate as a metal salt, H2FDA as a ligand and DMF as a solvent, stirring the mixed solution, baking, separating and washing the solid to obtain the multifunctional rare earth metal-organic framework. The multifunctional rare earth metal-organic framework provided by the invention has an fluorescent identification function on cancerigenic organic solvents, such as methylbenzene, benzene and acetone, has excellent selective adsorptivity for gas and high acting force with H2, contains high adsorptive enthalpy, and thus, is a multifunctional novel-structure microporous MOF (metal-organic framework) material.

Description

Technical field

[0001] The invention relates to a fluorescent probe, a gas adsorption and separation dual-functional material, in particular to a multifunctional rare earth metal-organic framework and a preparation method thereof.

Background technique

[0002] Metal-Organic Frameworks (MOFs) are porous crystalline materials formed by coordination bonds between metal ions or clusters and organic ligands. Aspects such as gas adsorption and separation, catalysis, photoelectric and magnetic materials, and sensors have attractive application potentials, and are rapidly developing into research hotspots in the interdisciplinary fields of energy, materials, and life sciences. (See: Yaghi OM et al., Nature, 1995, 378, 703; Zhou HC et al., Chem. Soc. Rev., 2009, 38, 1477).

[0003] For a long time, compared with the main group metal and transition metal MOFs, the research on rare earth MOFs is still relatively small. This may be due to the high coordination numbers and flexible...

Examples

Embodiment 1

[0020] A method for preparing a multifunctional rare earth metal-organic framework, using europium nitrate hexahydrate as the metal salt, and using H 2 FDA is used as a ligand, and DMF is used as a solvent. The synthesis steps are as follows:

[0021] 1) 44.6mg of Eu(NO 3 ) 3 ·6H 2 O and 31.2 mg of H 2 Put FDA's into the polytetrafluoroethylene liner of the hydrothermal reactor and mix, then add 2mL of DMF solvent, and stir for 2min at room temperature;

[0022] 2) Put the reaction kettle with the above mixed solution in an oven, bake at 120°C for 21 hours, and separate the solid after taking out the product;

[0023] 3) The above solid was washed 3 to 5 times with DMF to obtain light yellow strip crystals of the metal framework material of europium or terbium ions, and the yield calculated based on metal Eu was 63%.

Embodiment 2

[0025] A method for preparing a multifunctional rare earth metal-organic framework, using terbium nitrate hexahydrate as the metal salt, and using H 2 FDA is used as a ligand, and DMF is used as a solvent. The synthesis steps are as follows:

[0026] 1) Add 45.3mg of Tb(NO 3 ) 3 ·6H 2 O and 31.2 mg of H 2 Put FDA's into the polytetrafluoroethylene liner of the hydrothermal reactor and mix, then add 2mL of DMF solvent, and stir for 2min at room temperature;

[0027] 2) Put the reaction kettle with the above mixed solution in an oven, bake at 120°C for 21 hours, and separate the solid after taking out the product;

[0028] 3) The above solid was washed 3 to 5 times with DMF to obtain light yellow strip crystals of the metal framework material of europium or terbium ions, and the yield calculated based on metal Tb was 66%.

[0029] Characterization of the multifunctional metal-organic framework material structure:

[0030] 1) Structural determination of the metal-organic fram...

Technical field

[0001] The invention relates to a fluorescent probe, a gas adsorption and separation dual-functional material, in particular to a multifunctional rare earth metal-organic framework and a preparation method thereof.

Background technique

[0002] Metal-Organic Frameworks (MOFs) are porous crystalline materials formed by coordination bonds between metal ions or clusters and organic ligands. Aspects such as gas adsorption and separation, catalysis, photoelectric and magnetic materials, and sensors have attractive application potentials, and are rapidly developing into research hotspots in the interdisciplinary fields of energy, materials, and life sciences. (See: Yaghi OM et al., Nature, 1995, 378, 703; Zhou HC et al., Chem. Soc. Rev., 2009, 38, 1477).

[0003] For a long time, compared with the main group metal and transition metal MOFs, the research on rare earth MOFs is still relatively small. This may be due to the high coordination numbers and flexible...

Examples

Embodiment 1

[0020] A method for preparing a multifunctional rare earth metal-organic framework, using europium nitrate hexahydrate as the metal salt, and using H 2 FDA is used as a ligand, and DMF is used as a solvent. The synthesis steps are as follows:

[0021] 1) 44.6mg of Eu(NO 3 ) 3 ·6H 2 O and 31.2 mg of H 2 Put FDA's into the polytetrafluoroethylene liner of the hydrothermal reactor and mix, then add 2mL of DMF solvent, and stir for 2min at room temperature;

[0022] 2) Put the reaction kettle with the above mixed solution in an oven, bake at 120°C for 21 hours, and separate the solid after taking out the product;

[0023] 3) The above solid was washed 3 to 5 times with DMF to obtain light yellow strip crystals of the metal framework material of europium or terbium ions, and the yield calculated based on metal Eu was 63%.

Embodiment 2

[0025] A method for preparing a multifunctional rare earth metal-organic framework, using terbium nitrate hexahydrate as the metal salt, and using H 2 FDA is used as a ligand, and DMF is used as a solvent. The synthesis steps are as follows:

[0026] 1) Add 45.3mg of Tb(NO 3 ) 3 ·6H 2 O and 31.2 mg of H 2 Put FDA's into the polytetrafluoroethylene liner of the hydrothermal reactor and mix, then add 2mL of DMF solvent, and stir for 2min at room temperature;

[0027] 2) Put the reaction kettle with the above mixed solution in an oven, bake at 120°C for 21 hours, and separate the solid after taking out the product;

[0028] 3) The above solid was washed 3 to 5 times with DMF to obtain light yellow strip crystals of the metal framework material of europium or terbium ions, and the yield calculated based on metal Tb was 66%.

[0029] Characterization of the multifunctional metal-organic framework material structure:

[0030] 1) Structural determination of the metal-organic fram...

Images