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Preparation and application of a benzimidazolium salt and its supramolecular hydrogel

A benzimidazole and hydrogel technology, applied in benzimidazolium salt compounds and their preparation, in the field of supramolecular hydrogels, can solve the problems of ion/molecular detection limitations and the like, and achieve the effect of realizing sensitive detection

Active Publication Date: 2021-09-03
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in real life, various ions / molecules that are beneficial or harmful to the human body mostly exist in the water phase, and most of the reported methods that can detect ions are carried out in solution, and the detection of ions / molecules is also difficult. Relatively limited

Method used

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  • Preparation and application of a benzimidazolium salt and its supramolecular hydrogel
  • Preparation and application of a benzimidazolium salt and its supramolecular hydrogel
  • Preparation and application of a benzimidazolium salt and its supramolecular hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1, the preparation of benzimidazolium salt BI

[0031]Weigh 1.03 g (3.0 mmol) 2-undecyl-1-H-benzimidazole-3-acetic acid methyl ester, 1.27 g (9.0 mmol) methyl iodide, add to 1ml acetonitrile, and store at 85~90°C React for 30~32 h; after the reaction, cool to room temperature, remove the solvent by suction filtration, and use DMF / EtOH / H 2 O was recrystallized to obtain a white solid product, namely benzimidazolium salt BI, with a yield of 53.9%.

Embodiment 2

[0032] Embodiment 2, preparation of supramolecular organic hydrogel BI-G

[0033] Take 0.001 g of benzimidazolium salt BI prepared in Example 1, add 1.00 mL of ethylene glycol / water (v / v=1:9), heat to fully dissolve, let stand, and cool to room temperature to form a mass volume Supramolecular organohydrogel BI-G with a ratio of 1 mg / mL. The gel BI-G is white and has a transition temperature of 46°C.

Embodiment 3

[0034] Example 3. Supramolecular organic hydrogel BI-G colorimetric-fluorescent recognition of nitrite ions

[0035] Pipette supramolecular organic hydrogel BI-G into a series of drip plates, add 15 μL NaCl, NaCl 2 SO 4 , NaClO 4 , NaNO 2 , NaNO 3 , Na 3 PO 4 , NaH 2 PO 4 , NaHSO 3 , Na 2 S 2 o 3 , Na 2 HPO 4 sodium salt solution (concentration is 0.1M), if the fluorescence of the supramolecular organic hydrogel BI-G is quenched, it means that the dropwise addition is NaNO 2 , if the fluorescence of the supramolecular organic hydrogel is not quenched, it means that NaNO is not added 2 .

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Abstract

The invention discloses a benzimidazolium salt BI, which uses acetonitrile as a solvent, 2-undecyl-1-H-benzimidazole-3-methyl acetate and methyl iodide as substrates, and is prepared at 85-90 Reaction at ℃ for 30~32h; after the reaction is completed, cool to room temperature, remove the solvent by suction filtration, and obtain it by recrystallization. The benzimidazolium salt is heated and dissolved in an organic solvent-water mixed solvent, and a stable supramolecular organic hydrogel BI-G is formed after cooling to room temperature. Add NaCl, Na 2 SO 4 , NaClO 4 , NaNO 2 , NaNO 3 , Na 3 PO 4 , NaH 2 PO 4 , NaHSO 3 , Na 2 S 2 o 3 , Na 2 HPO 4 In aqueous solution, only NaNO 2 The addition of can cause the fluorescence quenching of supramolecular organohydrogels. Therefore, the supramolecular hydrogel BI‑G has a positive effect on NaNO 2 With a single selective fluorescence response performance, it can realize the detection of NO in water 2 ‑ fluorescence recognition.

Description

technical field [0001] The present invention relates to a benzimidazolium salt compound and a preparation method thereof; the present invention also relates to a supramolecular hydrogel based on benzimidazolium salt; the present invention also relates to the supramolecular hydrogel high sensitivity colorimetric -Application of fluorescent recognition of nitrite ions, which belongs to the field of compound synthesis and the field of anion detection. Background technique [0002] Nitrite is a pollutant of concern to humans and the entire ecosystem, but is also a popular food additive that can improve color, texture and storage stability, and is widely used as a corrosion inhibitor, food preservative and chemical fertilizers. NO 2 - Toxic to microorganisms and higher animals. The World Health Organization has declared NO 2 - The lethal level is considered to be in the range of 8.7~28.3μM -1 . In the ecosystem, the excess nitrite in our body will oxidize hemoglobin, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D235/08C08G83/00C09K11/06G01N21/64
CPCC07D235/08C08G83/008C09K11/06C09K2211/1466G01N21/6428G01N2021/6432
Inventor 姚虹王姣周琦关晓文樊彦青林奇魏太保张有明
Owner NORTHWEST NORMAL UNIVERSITY
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