Iodide ion sensing material and its application in iodide ion fluorescence and chromogenic detection

A sensing material and fluorescence detection technology, which is applied in the field of iodide ion sensing, can solve the problems of increasing costs and achieve good fluorescence sensing selectivity and sensitivity

Inactive Publication Date: 2012-05-02
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently used to detect I - All materials have good selectivity or sensitivity only in fluorescence or chromogenicity, and the difference in fluorescence can only be identified by instruments at low concentrations, which increases the cost of detection

Method used

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  • Iodide ion sensing material and its application in iodide ion fluorescence and chromogenic detection
  • Iodide ion sensing material and its application in iodide ion fluorescence and chromogenic detection
  • Iodide ion sensing material and its application in iodide ion fluorescence and chromogenic detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Synthesis of polyfluorene materials with octacarbazole in the side chain

[0036] We only take the synthesis of compound OCZ as an example to illustrate the present invention, but not to limit the present invention. All polyfluorene, polyphenylene, polystyrene, polyphenylene and trapezoidal polyphenylenes with fluorescent sensing active groups (pyrrole, carbazole, aniline, diphenylamine, triphenylamine or phenothiazine, etc.) on the side chain Synthetic idea or synthetic route of luminescent material, and use it for anion I - Fluorescent sensing and color-changing sensing are all within the design concept of the present invention.

[0037] synthetic route:

[0038]

[0039] 1. Synthesis of N-(6-bromo-hexane)-carbazole

[0040] Dissolve 5g (30mmol) of carbazole and 5mL (31mmol) of 1,6-dibromohexane in tetrahydrofuran, then add dropwise to the sodium hydride that has washed off the oxide film, and stir at room temperature for 24h. The remaining sodium hy...

Embodiment 2

[0052] Example 2: Luminescence properties of OCZ

[0053] In tetrahydrofuran solvent, the absorption peaks of OCZ are respectively at 262nm, 295nm and 363nm (such as figure 1 shown), while its emission in solution was at 408nm and 430nm, and in the solution of quinine sulfate (0.1M H 2 SO 4 ) as a reference, its solution fluorescence efficiency is as high as 98%, and it is a highly efficient blue light molecule.

Embodiment 3

[0054] Embodiment 3: OCZ is to the detection of anion in homogeneous liquid state

[0055] 1. Fluorescent response properties

[0056] In this system, the quality of the material's response to anion fluorescence is mainly judged according to the degree of fluorescence quenching of the material. Among the anions tested (F - , Cl - , Br - , I - , NO 3 - , AcO - and CO 3 2- ), OCZ is only for I - There is a phenomenon of fluorescence quenching, and the fluorescence response is very sensitive: when the system I - When the concentration is 0.3mM, the fluorescence of the solution has been quenched close to 100%, but there is basically no change for the addition of other anions (see figure 2 ). This sensitivity in OCZ to I - It is also reflected in the fluorescence titration curve ( image 3 ). According to the Stern-Volmer equation

[0057] lg(I 0 -I) / I=lgKsv+nlg(Q)

[0058] We can calculate OCZ to I - The compounding ratio is 2, and its quenching constant is as h...

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Abstract

The invention belongs to the field of iodide ion (I-) sensing technology, and specifically relates to a sensing material with 2,7-position of fluorene as the main chain and flexible alkyl connected carbazole group as the side chain. The sensing material has advantages of inexpensive and easily-obtained raw materials, simple synthesis steps and excellent detection sensitivity and ion selectivity. In common negative ions, the material only has responses to I-. When the concentration of I- in the system is 0.3 mM, the fluorescence quenching of the solution is close to 100%, and there is basically no change with the addition of other negative ions. Apart from good fluorescence detection selectivity and sensitivity, the sensing material is more excellent in chromogenic detection. When the concentration of I- in the solution system reaches 0.1 mM, obvious color change (from colorless transparency to yellow) can be observed by naked eyes. The I- detectable concentration accounts for 1 / 100 ofcurrently reported I- chromogenic sensing material. Therefore, the iodide ion sensing material provided by the invention is a good sensing material and has a wide application prospect.

Description

technical field [0001] The present invention belongs to iodide ion (I - ) Sensing technology field, be specifically related to a class with 2, the sensing material of 7-position fluorene as main chain, side chain is connected carbazole group through alkyl, and this class material is in highly sensitive, highly selective I - Applications in fluorescence and chromogenic detection. Background technique [0002] So far, anion recognition technology has attracted more and more researchers' interest because of the important role of anions in life science, medicine and environment. Sensing materials that can selectively recognize important anions in organisms and the environment have a wide range of applications. The most notable of these is the iodide ion (I - ) detection. I - It is one of the essential trace elements for the human body. It participates in energy metabolism and life activities in the human body, and promotes the development of the nervous system and the synth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64G01N21/78C09K11/06C07D209/86C08G61/12
Inventor 张明赵阳
Owner JILIN UNIV
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