A mercury ion fluorescent sensor and its synthesis and application to detect mercury ions in pure water
A fluorescent sensor and mercury ion technology, which is applied in the field of cation detection, can solve the problems of difficult circulation, difficult detection of mercury ions, and difficult detection of mercury ions, etc., and achieve good application prospects and high sensitivity.
Inactive Publication Date: 2019-02-19
NORTHWEST NORMAL UNIVERSITY
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Problems solved by technology
[0003] So far, on the one hand, many fluorescent probes for mercury ions have been synthesized, but most of the sensors contain sulfur atoms, which easily form Hg–S bonds with mercury, and make the recognition process irreversible and difficult to cycle.
And most of the sulfur-containing sensors are easily disturbed and affected in the sulfur-rich environment, and it is difficult to play the role of detecting mercury ions
On the other hand, in biological and environmental systems, mercury ions often appear in aqueous solutions, but most sensors are insoluble in water, and it is difficult to detect mercury ions in aqueous solutions
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[0045] The synthesis of the sensor molecule H of the present invention and the detection of Hg in water are as follows through specific examples. 2+ application is further explained.
[0046] 1. Synthesis of sensor molecule H
[0047] Put 10mmol of 1,8-naphthalene dicarboxylic anhydride and 10mmol of histidine in a 100mL round bottom flask, add 15mL of DMF, heat and reflux on an oil bath at 140°C for 24h, wait for the reaction to stop and cool to room temperature, add water to precipitate, pump The resulting solid was washed with heated DMF, and the dried white solid—N,N-bis(1,8-naphthalene dicarboxamide)histidine (H 1 ), yield: 40%.
[0048] Take 5mmol intermediate H 1 , 5mmol sodium hydroxide, placed in a 50 mL round bottom flask, added 25mL of water, stirred at room temperature for 30 minutes, after the reaction was completed, the solvent was spin-dried to obtain the product; that is, N,N-bis(1,8-naphthalene dimethyl Amide) the sodium salt of histidine, which is the sen...
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The invention discloses a mercury ion fluorescent sensor molecule using a naphthalene ring as a fluorescent signal report group and histidine as a hydrophilic group. DMF is adopted as a solvent, histidine and 1,8-naphthalic anhydride are adopted as a substrate, and a reflux reaction is conducted to obtain an intermediate, namely, N,N-bis(1,8-naphthalic amide)histidine; the intermediate is allowed to react with sodium hydroxide to form a sodium salt, namely, the mercury ion fluorescent sensor molecule. The sensor molecule can be used for specifically and selectively identifying mercury ions in pure water, and the identification process has very high sensitivity (the response time is within 5 seconds) and is free from interference by other cations. The invention also provides mercury ion test paper which is loaded with the sensor molecule, and the test paper has the advantages of being convenient to carry, obvious in phenomenon, rapid in detection and the like. In addition, the process of identifying mercury ions with the synthesized sensor molecule is reversible, and the sensor molecule can be recycled and has a very good application prospect in the cation detection field.
Description
technical field [0001] The invention belongs to the field of cation detection, and relates to a sensor for fluorescent recognition of mercury ions, in particular to a mercury ion fluorescent sensor molecule with a naphthalene ring as a fluorescent signal reporting group and histidine as a hydrophilic group and a preparation method thereof; The invention also relates to the application of the mercury ion fluorescence sensor molecule in pure water to detect mercury ions. Background technique [0002] Mercury is currently widely used in chemical raw materials, electrical equipment, silver amalgam and batteries. Mercury and mercury oxides in the natural state are very harmful to the human body and the natural environment. To be able to detect and monitor mercury in a variety of situations, an effective method is needed. Among various methods for detecting mercury ions, the fluorescent probe method has the characteristics of high sensitivity and easy operation, and has attracted...
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IPC IPC(8): C07D401/06C09K11/06G01N21/64
CPCC07D401/06C09K11/06C09K2211/1029C09K2211/1044G01N21/643G01N2021/6432G01N2021/6443
Inventor 张有明仲开鹏林奇姚虹魏太保
Owner NORTHWEST NORMAL UNIVERSITY