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Cadmium coordination polymer and application thereof to detection of nitro compounds in water

A technology for cadmium coordination polymers and compounds, which is applied to cadmium organic compounds, chemical instruments and methods, fluorescence/phosphorescence, etc. Product purification, high quenching efficiency, simple post-processing effect

Inactive Publication Date: 2015-05-06
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ma Jianfang's group reported the application of a coordination polymer in the detection of nitrobenzene (see: Yuan-Chun He, Hong-Mei Zhang, Ying-Ying Liu, Qiu-Yi Zhai, Qiu-Tong Shen, Shu-Yan Song, Jian-Fang Ma. Cryst. Growth Des. 2014, 14(7), 3174–3178); However, this method has a relatively high detection limit for nitro compounds and the detection of nitro compounds is relatively single
Wang Yaoyu's group reported the application of a coordination polymer in the detection of nitro compounds (see: Ling-Yan Pang, Guo-Ping Yang, Jun-Cheng Jin, Meng Kang, Ai-Yun Fu, Yao-Yu Wang, Qi-Zhen Shi. Cryst. Growth Des. 2014, 14, 2954?2961); However, this method has a relatively high detection limit for nitro compounds and the detection of nitro compounds is carried out in DMF

Method used

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  • Cadmium coordination polymer and application thereof to detection of nitro compounds in water
  • Cadmium coordination polymer and application thereof to detection of nitro compounds in water
  • Cadmium coordination polymer and application thereof to detection of nitro compounds in water

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Embodiment one: the synthesis of cadmium coordination polymer

[0041] Take cadmium nitrate tetrahydrate Cd(NO 3 ) 2 4H 2 O (5 mg, 0.02 mmol), 1,4-naphthalene dioic acid 1,4-H 2 NDC (2 mg, 0.01 mmol) and N-(2-pyridyl)-N-(4-(2-(4-pyridyl)vinyl)phenyl)pyridin-2-amine (7 mg, 0.02 mmol) Put it into an 8mL heat-resistant glass tube, add 3mL of acetonitrile / water mixed solvent with a volume ratio of 1:2, and seal it. React at a constant temperature of 150°C in an oven for 24 hours, and slowly cool down to room temperature at a rate of 5°C / hour. Two days later, yellow crystals were obtained, filtered, washed with ethanol, and dried in vacuum to obtain the target product {Cd(ppvppa)(1,4-NDC) } n , weighing. Yield: 6.5 mg, yield: 48 % (calculated based on metal cadmium); IR (potassium bromide compressed tablet): ν = 3063(m), 1636(w), 1600(s), 1586(s), 1552(m), 1432(s), 1405(s), 1353(s), 1331(s), 787(m) , 547 (m) cm -1 ;Elemental Analysis C 35 h 24 CdN 4 o 4 : Theor...

Embodiment 2

[0048] The product obtained in Example 1 was used to detect 2,4-dinitrophenol in water. The structural formula of 2,4-dinitrophenol is:

[0049]

[0050] Add about 2 mg of cadmium coordination polymer and 2 mL of water into a small test tube, and sonicate in an ultrasonic instrument for about 1 hour, so that the cadmium coordination polymer is evenly dispersed in the water. Subsequently, 2,4-dinitrophenol was added quantitatively. When the amount of 2,4-dinitrophenol added was 70ppm, the fluorescence quenching efficiency reached 97%, and the fluorescence emission intensity of the complex dispersed in water was close to 0, indicating that The fluorescence of the complex is basically quenched, see attached image 3 .

[0051] The fluorescence quenching efficiency refers to the ratio of the change value of the fluorescence intensity before and after adding the nitro compound to the original value:

[0052] Fluorescence quenching efficiency = (the original fluorescence of th...

Embodiment 3

[0056] The product obtained in Example 1 was used to detect p-nitrophenol in water. The structural formula of p-nitrophenol is:

[0057]

[0058] Add about 2 mg of cadmium coordination polymer and 2 mL of water into a small test tube, and sonicate in an ultrasonic instrument for about 1 hour, so that the cadmium coordination polymer is evenly dispersed in the water. Then add p-nitrophenol quantitatively. When the amount of p-nitrophenol added is 120ppm, the fluorescence quenching efficiency reaches 95%, and the fluorescence emission intensity of the complex dispersed in water is close to 0, indicating that the fluorescence of the complex is basically quenched. , see attached Image 6 .

[0059] Figure 7 It is the quenching efficiency diagram when cadmium coordination polymer is dispersed in water and different concentrations of p-nitrophenol are added. It can be seen from the figure that when p-nitrophenol is added at 1-6ppm, the quenching efficiency is linear, and the ...

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Abstract

The invention discloses a cadmium coordination polymer and an application thereof to the detection of nitro compounds in water. The cadmium coordination polymer is prepared in a simple condition. The cadmium coordination polymer has a stable structure in water and has very good selectivity and relatively low detection limit on 2,4-dinitrophenol; the fluorescence quenching efficiency of 70 ppm of 2,4-dinitrophenol to the cadmium coordination polymer dispersed in the water can reach 97%. Moreover, the cadmium coordination polymer can be separated and recycled for multiple times, therefore relatively high quenching efficiency is kept.

Description

technical field [0001] The invention relates to a cadmium coordination polymer, in particular to a cadmium coordination polymer based on N-(2-pyridyl)-N-(4-(2-(4-pyridyl)vinyl)phenyl)pyridin-2-amine A cadmium coordination polymer as a ligand, a preparation method of the coordination polymer and its application in the detection of nitro compounds in water. Background technique [0002] The detection of nitro compounds is very important for homeland security, military applications, forensic investigations and environmental protection. These compounds are environmental pollutants and potentially explosives. Therefore, the detection of nitro compounds is an important topic. [0003] At present, the main methods for detecting nitro compounds basically rely on trained explosion-proof dogs or sophisticated equipment such as GC-MS, surface-enhanced Raman spectrometer, neutron activation analyzer, electron capture detector and cyclic voltammetry instrument and so on. However, the...

Claims

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Application Information

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IPC IPC(8): C07F3/08C09K11/06G01N21/64
Inventor 郎建平陈敏敏
Owner SUZHOU UNIV
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