Lanthanum-based metal organic framework Ln-MOF material and preparation method thereof

An organic framework and lanthanide metal technology, applied in the field of lanthanide metal-organic framework material synthesis, can solve the problems of low rare earth ion sensitization, low quantum efficiency and fluorescence lifetime, etc. The effect of ultra-high quantum efficiency

Pending Publication Date: 2022-01-07
黑龙江希光科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problem of low sensitization degree of existing ligands to rare earth ions, resulting in low quan

Method used

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  • Lanthanum-based metal organic framework Ln-MOF material and preparation method thereof
  • Lanthanum-based metal organic framework Ln-MOF material and preparation method thereof
  • Lanthanum-based metal organic framework Ln-MOF material and preparation method thereof

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Example Embodiment

[0021] DETAILED DESCRIPTION an: embodiment of the present embodiment lanthanide Ln-MOF metal organic framework material, chemical formula of lanthanide metal Ln-MOF-organic framework materials are [Ln (C 7 Hide 3 NO 4 ) (H (C 7 Hide 3 NO 4 ))] n , Where n> 0, and a is a positive integer; crystal system monoclinic space group P121 / C1, with unit cell parameters α = 90 °, β = 102.375 ° (5), γ = 90 °, Z = 4.

[0022] The present embodiment a very suitable embodiment is designed ligand (pyridine-2,6-dicarboxylic acid H 2 PDA) and lanthanide elements Ln-MOF ligands to obtain a series of homogeneous material, in this embodiment chosen ligand lanthanide ions have a strong sensitization, so that fluorescent properties of rare earth would be enhanced, and by the embodiment of the method of the crystalline material was obtained having a very high quantum efficiency and a long fluorescence lifetime, this material may be applied in the field of sensing and other aspects.

[0023] The bene...

Example Embodiment

[0027] DETAILED Embodiment 2: This embodiment of a method for preparing lanthanide Ln-MOF metal organic framework material, which is performed by the following steps:

[0028] The 2,6-pyridinedicarboxylic acid with a rare earth salt successively added to the water in the autoclave, and then distilled water was added, the stirring speed is 60r / min ~ 80r / min, conditions, stirred 30min ~ 60min, and then at a heating rate of 5 ℃ / min ~ 8 ℃ / min, the temperature was raised to 150 ℃ ~ 180 ℃, and at a temperature of 150 ℃ ~ 180 ℃ conditions, incubation time 72h ~ 120h, and finally washed, centrifuged and dried to obtain lANTHANIDE Ln-MOF material skeleton;

[0029] The dicarboxylic acid and pyridine-2,6 mass ratio of rare earth salt is 1: (1.4 to 1.5).

[0030] The ligand in the method is applicable to all lanthanide (La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu).

Example Embodiment

[0031] DETAILED DESCRIPTION III: different from the second embodiment according to the present embodiment is a specific embodiment: the mass of distilled water and 2,6-pyridinedicarboxylic acid volume ratio of 1g: (5 ~ 7) mL. DETAILED same manner as the other two embodiments.

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Abstract

The invention discloses a lanthanum-based metal organic framework Ln-MOF material and a preparation method thereof, belongs to the technical field of synthesis of lanthanum-based metal-organic framework materials, and aims to solve the problems of low quantum efficiency and low fluorescence lifetime caused by low rare earth ion sensitization degree of the existing ligand. The chemical general formula of the lanthanum-based metal organic framework Ln-MOF material is [Ln(C7H3NO4)(H(C7H3NO4))]n, wherein n is greater than 0 and is a positive integer. The preparation method comprises the following steps: sequentially adding 2,6-pyridinedicarboxylic acid and a rare earth salt into a hydrothermal kettle, adding distilled water, stirring and heating, preserving heat at a certain temperature, and finally washing, centrifuging and drying. The invention is used for the lanthanum-based metal organic framework Ln-MOF material and the preparation thereof.

Description

technical field [0001] The invention belongs to the technical field of synthesis of lanthanide metal-organic framework materials. Background technique [0002] Among many MOF-based functional materials, lanthanide metal-organic frameworks (Ln-MOFs) are a new class of organometallic framework materials because of their unusual patterns, high coordination numbers, and well-connected lanthanide ions and ligands. properties, which contribute to the formation of a multidimensional network with high thermal and chemical stability. Meanwhile, the lanthanide ions, as the metal components of Ln-MOFs, exhibit sharp luminescence and high color purity due to their large Stokes shifts. In particular, a variety of Ln-MOFs can be obtained by in-situ doping to realize color-changing sensing of luminescence, which has aroused great interest. However, due to the low sensitivity of many ligands to rare earth ions, the quantum efficiency and fluorescence lifetime are not good. Satisfactory. ...

Claims

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Application Information

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IPC IPC(8): C08G83/00C09K11/06
CPCC08G83/008C09K11/06C09K2211/182
Inventor 李玉鑫赵丽娜
Owner 黑龙江希光科技有限公司
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