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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 quantum efficiency and low fluorescence lifetime, and provides a lanthanide metal-organic framework Ln-MOF material and a preparation method thereof

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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specific Embodiment approach 1

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

[0022] This embodiment has designed a very suitable ligand (2,6-pyridinedicarboxylic acid H 2 PDA) coordinates with lanthanide elements to obtain a series of isomorphic Ln-MOF materials. The ligands selected in this embodiment have a strong sensitization effect on lanthanide ions, which improves the fluorescence properties of rare earths. The crystal material prepared by the method in the embodiment has very high quantum efficiency and long fluorescence lifetime, and this material can be applied in the fields of sensing and the like.

[0023] The be...

specific Embodiment approach 2

[0027] Specific embodiment two: present embodiment a kind of preparation method of lanthanide metal organic framework Ln-MOF material, it is carried out according to the following steps:

[0028] Add 2,6-pyridinedicarboxylic acid and rare earth salts into the hydrothermal kettle in turn, then add distilled water, and stir for 30min-60min at a stirring speed of 60r / min-80r / min, and then increase the temperature at a rate of 5°C / min~8℃ / min, the temperature is raised to 150℃~180℃, and under the condition of 150℃~180℃, the holding time is 72h~120h, finally washed, centrifuged and dried to obtain lanthanide metal organic Skeleton Ln-MOF material;

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

[0030] This ligand is suitable for all lanthanide metals (La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) in this method.

specific Embodiment approach 3

[0031] Embodiment 3: This embodiment is different from Embodiment 2 in that: the volume ratio of the mass of 2,6-dipicolinic acid to distilled water is 1 g:(5-7) mL. Others are the same as in the second embodiment.

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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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