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Polyoxometalate-based metal-organic frameworks crystal material with polyoxometalates as template

A technology of organic frameworks and crystal materials, applied in the field of polyacid-based metal-organic framework crystal materials, can solve the problems of difficulty and poor catalytic activity, and achieve the effect of maintaining catalytic activity and excellent photocatalytic performance

Inactive Publication Date: 2018-12-14
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the difficulty of synthesizing polyacid-based metal-organic framework crystal materials using the prior art and the problem of poor catalytic activity of traditional polyacids as photocatalysts, and to provide a polyacid-based metal-organic framework assembled with polyacids as templates. Framework crystal material and preparation method

Method used

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  • Polyoxometalate-based metal-organic frameworks crystal material with polyoxometalates as template
  • Polyoxometalate-based metal-organic frameworks crystal material with polyoxometalates as template
  • Polyoxometalate-based metal-organic frameworks crystal material with polyoxometalates as template

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specific Embodiment approach 1

[0027] Embodiment 1: This embodiment is a polyacid-based metal-organic framework crystal material assembled with polyacid as a template. The chemical formula is [Cu Ⅰ 2 (PPZ) 4 ][H 2 GeW 12 o 40 ]·8H 2 O, where ppz is 3-(pyridin-4-yl)pyrazole; the crystal system is monoclinic; the space group is Cm; the unit cell parameters are a=90(5), b=109.9510(5), g=90 (5), a=12.5419(5) Å, b=22.4521(9) Å, c=11.6246(5) Å, z=2.

[0028] The [Cu Ⅰ 2 (PPZ) 4 ][H 2 GeW 12 o 40 ]·8H 2 The valence of Cu in O is +1, and the coordination mode is 4 coordination.

[0029] Compared with the prior art, this embodiment has the following characteristics:

[0030] The present invention adopts a simple one-step hydrothermal synthesis method, and for the first time successfully prepared a polyacid-based metal polyacid as a template assembly by using 3-(pyridin-4-yl)pyrazole organic ligand, copper chloride and germanium tungstic acid Organic framework crystal material; single crystal X-ray diffr...

specific Embodiment approach 2

[0031] Specific embodiment 2: This embodiment is a method for preparing a polyacid-based metal-organic framework crystal material assembled from polyacid as a template, which is completed in the following steps:

[0032] 1. Prepare a reaction solution with a pH value of 2.5: dissolve germanium tungstic acid, copper chloride, and 3-(pyridin-4-yl)pyrazole organic ligand into deionized water to obtain a reaction solution; adjust the pH value of the reaction solution To 2.5, the pH value obtained is 2.5 reaction solution;

[0033] The molar ratio of germanium tungstic acid to metal copper salt described in step 1 is: 0.1: (0.2-1);

[0034] The molar ratio of the germanium tungstic acid described in step 1 to the organic ligand containing 3-(pyridin-4-yl)pyrazole is: 0.1: (0.2-0.5);

[0035] The volume ratio of the amount of germanium tungstic acid described in step 1 to distilled water is: 0.1mmol: (20ml~35ml);

[0036] 2. Add the reaction solution with a pH value of 2.5 into a ...

specific Embodiment approach 3

[0040] Embodiment 3: The difference between this embodiment and Embodiment 2 is that the metal copper salt described in step 1 is copper chloride, copper nitrate or copper acetate. Others are the same as in the second embodiment.

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Abstract

The invention relates to polyoxometalate-based metal-organic frameworks crystal material assembled with polyoxometalates as a template, and relates to the polyoxometalate-based metal-organic frameworks crystal material assembled with the polyoxometalates as the template. The invention aims to solve the problem that a semiconductor structure formed between end oxygen of the polyoxometalates (POMs)in polyoxometalate-based metal-organic frameworks (POMOFs) crystal material synthesized by the prior art and metals in metal-organic frameworks (MOFs) has the conduction band greater than 0, resultingin a fact that the POMOFs material has no effect of hydrogen production by decomposing water under irradiation of a xenon lamp. The designed and developed POMOFs crystal material with the polyoxometalates as the template has the chemical formula of [CuI2(PPZ)4][H2GeW12O40].8H2O. A method comprises the steps: dissolving germanotungtic acid, copper chloride and 3-(pyridin-4-yl)pyrazole organic ligands in deionized water, adjusting the pH value, and then carrying out reaction for 3 d at the temperature of 160 DEG C. The POMOFs crystal material assembled with the polyoxometalates as the templatecan be obtained.

Description

technical field [0001] The invention discloses a polyacid-based metal organic framework crystal material assembled with polyacid as a template. Background technique [0002] Polyoxometalates (POMs for short) is the abbreviation of polyoxometalates, which is an important part of contemporary inorganic chemistry. Compared with traditional solid acid catalysts, polyoxometalates have higher catalytic activity, and the catalytic chemical reaction conditions are generally It has become a new type of green catalyst due to its mild nature, low toxicity, and few catalytic by-products, and has received extensive attention and in-depth research. Polyacids have excellent redox properties and Brönsted acid properties, and their composition elements are adjustable. Its own oxidation-reduction potential is easy to control. At the same time, due to the "pseudo-liquid phase" reaction field of polyacid, the reaction can not only be carried out on the surface, but also inside the bulk phase, i...

Claims

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Application Information

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IPC IPC(8): C08G83/00
CPCC08G83/008
Inventor 庞海军李柏男马慧媛沈清波张春晶王新铭
Owner HARBIN UNIV OF SCI & TECH
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