Preparation method of super-molecule metal gel

A metal gel and supramolecular technology, applied in zinc organic compounds, cadmium organic compounds, lead organic compounds, etc., can solve problems such as insufficient coordination bonds

Inactive Publication Date: 2014-07-23
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the supramolecular gels currently studied use hydrogen bonding or molecular packing, while coordination bonds, which are equally important in supramolecular chemistry, are far from being used in gel synthesis.

Method used

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  • Preparation method of super-molecule metal gel
  • Preparation method of super-molecule metal gel
  • Preparation method of super-molecule metal gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, the preparation of gel G1

[0023] (1) Preparation of compound L1 (N,N'-dicarboxymethyl-2-ethylbenzimidazole):

[0024] Take 4.00 g (42 mmol) of chloroacetic acid in a three-neck round bottom flask equipped with a reflux condenser, and adjust the pH value to 8~10 with NaOH solution, add 3.49 g (14 mmol) of 2-ethylbenzimidazole, and heat to reflux During this period, the pH value was continuously adjusted to maintain the pH value of the system at 8~10, until the pH value was stable, and then continued to reflux for 30 minutes, cooled, and added concentrated hydrochloric acid to adjust the pH value to 2~3, and a large amount of white precipitates formed. Let stand overnight, filter with suction, wash with distilled water and acetone three times respectively, and then recrystallize with water to obtain a white solid.

[0025] Melting point: 279~281°C Yield: 70%. 1 H NMR (400MHz D 2 O, ppm) δ: 7.45~7.56 (m, 4H, ), 4.65~5.01 (d, 4H), 3.03~3.05 (d, 2H), 1.10~...

Embodiment 2

[0028] Embodiment 2, the preparation of gel G2

[0029] (1) Preparation of compound L2 (N,N'-dicarboxymethyl-2-propylbenzimidazole):

[0030] Take 4.00g (42mmol) of chloroacetic acid in a three-neck round bottom flask equipped with a reflux condenser, and adjust the pH value to 8~10 with NaOH solution, add 3.86g (14mmol) of 2-propyl benzimidazole, and heat to reflux During this period, the pH value was continuously adjusted to maintain the pH value of the system at 8~10, until the pH value was stable, and then continued to reflux for 30 minutes, cooled, and added concentrated hydrochloric acid to adjust the pH value to 2~3, and a large amount of white precipitates formed. Let stand overnight, filter with suction, wash with distilled water and acetone three times respectively, and then recrystallize with water to obtain a white solid.

[0031] Melting point: 285~286 o C yield: 66%. 1 H NMR (400MHz D 2 O, ppm) δ: 7.46~7.57 (m, 4H), 4.56~4.75 (d, 4H), 1.57~1.63 (m 2H), 2.99~...

Embodiment 3

[0034] Embodiment 3, the preparation of gel G1

[0035] (1) Preparation of compound L1 (N,N'-dicarboxymethyl-2-propylbenzimidazole): same as Example 1.

[0036](2) Preparation of Gel G1

[0037] Mix compound L1 and copper sulfate in the amount of substance 1:1, add to H 2 O / DMSO mixed solution (H 2 The volume ratio of O to DMSO is 2:1), treated with 40 kHz sonication for 6 seconds, and left at room temperature to form a white fibrous gel G1. The formed gel returns to the solution state upon heating.

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Abstract

The invention provides a preparation method of super-molecule metal gel and belongs to the field of functional materials. The super-molecule metal gel is obtained by a complex formed by complexing a benzimidazole carboxylic acid derivative as well as metallic lead, cadmium, copper and zinc in H2O / CH3OH, H2O / DMSO, H2O / CH3CN, H2O / CHC13 or H2O / DMF systems under the ultrasonic condition. FT-IR spectrum and X-ray diffraction results show that the gel prepared according to the invention is formed by constraining solvent micromolecules through the coordination complex formed by the benzimidazole carboxylic acid derivative and the metallic ions; and as the gel shows the conversion nature of reversible gel-sol under the acid-base control, the gel can be used for making a controllable molecular switch.

Description

technical field [0001] The invention belongs to the field of functional materials, and relates to a supramolecular metal gel, in particular to a supramolecular metal gel formed by benzimidazole carboxylic acid derivatives and metal lead, cadmium, copper, and zinc under the action of ultrasound, mainly For making controllable molecular switches. Background technique [0002] In recent years, supramolecular gels have gradually developed into a class of smart / functional nanomaterials with broad application prospects. Most of the supramolecular gels currently studied utilize hydrogen bonding or molecular packing, while coordination bonds, which are equally important in supramolecular chemistry, are far from being used in gel synthesis. Since the introduction of metal ions can bring new properties such as photoelectricity, catalysis, and redox to the gel, the research on supramolecular metallogels has also been heated up in recent years. Contents of the invention [0003] The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F7/24C07F3/08C07F1/08C07F3/06C07D235/08
Inventor 张有明张万强林奇魏太保
Owner NORTHWEST NORMAL UNIVERSITY
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