Gasochromic rare earth complex and preparation method and application thereof

A rare-earth complex and aerochromic technology, which are applied to compounds containing group 3/13 elements of the periodic table, color-changing fluorescent materials, chemical instruments and methods, etc., can solve the problems of luminous brightness and monochromaticity, response efficiency, and stability The complexity of preparation of active complexes is low, the performance parameters cannot meet the needs of aerochromic materials, and the production and promotion of materials are restricted, so as to achieve the effects of improved response intensity, high yield, and simple method

Inactive Publication Date: 2010-08-11
SUN YAT SEN UNIV
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  • Claims
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Problems solved by technology

But so far, the examples of aerochromism based on metal-organic complexes are basically limited to complexes of transition metals such as Pd, Pt, Ir, and Au, especially noble metals. The complexity of the preparation of the material is lower than the performance parameters required for practical applications
Moreover, since most of the metals used to prepare aerochromic materials are relatively scarce, the production and promotion of such materials are further restricted.
Existing technologies are far from meeting market demand for aerochromic materials

Method used

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  • Gasochromic rare earth complex and preparation method and application thereof
  • Gasochromic rare earth complex and preparation method and application thereof
  • Gasochromic rare earth complex and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Preparation of ligand:

[0026] (1) Add 16.2g (0.15mol) of o-phenylenediamine and 9.6g (0.05mol) of amine triacetic acid into a 250ml round bottom flask, add 60ml of ethylene glycol and stir evenly, heat the oil bath to 140-200 degrees to reflux 8-12 hours, during the reaction process, a water separator can be installed to draw the generated water out of the reaction system; after the reaction, cool slightly while stirring and pour into 200ml of water, filter, recrystallize ethanol (decolorize with activated carbon if necessary), and obtain the product NTB (Yield 85%).

[0027] (2) In a 150ml three-necked flask, 1.02g (0.0025mol) NTB and 50ml of tetrahydrofuran treated with sodium metal were added in batches under the protection of nitrogen flow, 0.3g (0.0077mol, due to the oxidation of potassium and the incomplete removal of Water, metal potassium requires a little excess) metal potassium until no hydrogen is produced, then refluxed for 1-2 hours, and the system be...

Embodiment 2

[0032] The test of the luminescent properties of the complex: measured by the FLS920 fluorescence analyzer of EDINBURGH Company in the United Kingdom, the sample emits the characteristic linear emission of Eu(III) ions at 594, 611, and 620 nm under the excitation of 370 nm incident light.

[0033] The fluorescence test shows that under the excitation of 370nm ultraviolet light, the ligand absorbs energy and transfers it to the rare earth metal, emitting the characteristic red line emission of Eu(III), as shown in the attached figure 2 shown.

Embodiment 3

[0035] Test of gasochromism of complexes:

[0036] The complex was exposed to methanol or acetonitrile vapor for 10 minutes, and the schematic diagram of the fluorescence enhancement under the vapor atmosphere is shown in the attached image 3 shown. Pictured (left) is the initial sample, (middle) exposed to an atmosphere of methanol, and (right) exposed to an atmosphere of acetonitrile.

[0037] The results show that when the complex is exposed to methanol or acetonitrile vapor, obvious aerochromic phenomenon occurs, and the fluorescence intensity is increased by 18.1 times and 15 times respectively, and the response speed is fast. Reach the strongest within.

[0038] Then methanol or acetonitrile vapor was removed, and nitrogen gas was introduced for 10 minutes. The fluorescence intensity of the former weakened and returned to the initial state before the methanol vapor was not passed, while the fluorescence intensity of the latter did not weaken with the removal of aceton...

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Abstract

The invention discloses a gasochromic rare earth complex. The structure of the gasochromic rare earth complex is obtained by the coordination of rare earth metal Eu (III) and a tripod type ligand MeNTB. The invention also discloses a preparation method of the above complex, comprising: carrying out coordination on rare earth salt and MeNTB ligand at the molar ratio of 1:2 to obtain the gasochromic rare earth complex. The gasochromic phenomenon obtained by the complex of the invention has high signal strength, speed, stability and repeatability; moreover, the response strength, response range and response time can be further improved by decorating the ligand and selecting metal; in addition, the complex can be used for designing gasochromic switches and logic gate devices and has wide application prospect.

Description

technical field [0001] The invention relates to a rare earth complex with aerochromic phenomenon, its preparation method and device design, in particular to the preparation of a luminescent rare earth complex sensitive to methanol and acetonitrile vapor and the aerochromic compound based on the complex. Design methods for color-changing switches and logic gate devices. Background technique [0002] In recent years, aerochromic materials have attracted much attention because of their applications in molecular recognition and chemical sensors. Among them, gasochromic materials based on metal-organic complexes have opened up a new world in the design and application of this field because of their strong chemical modification, wide response range, fast speed, and good thermal stability. But so far, the examples of aerochromism based on metal-organic complexes are basically limited to complexes of transition metals such as Pd, Pt, Ir, and Au, especially noble metals. The comple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F5/00C07D235/14C09K9/02G02F3/00
Inventor 潘梅刘煜严诚李康王雪涛苏成勇
Owner SUN YAT SEN UNIV
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