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Asymmetric squarylium cyanine colorimetric probe for identifying copper ions and application of asymmetric squarylium cyanine colorimetric probe

A colorimetric probe, asymmetric technology, applied in chemical instruments and methods, measurement of color/spectral characteristics, analysis through chemical reactions of materials, etc., can solve the problems of unstudied selectivity, achieve good selectivity, The effect of high sensitivity and excellent optical performance

Active Publication Date: 2022-04-12
CHANGZHOU UNIV
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  • Claims
  • Application Information

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Problems solved by technology

Among them, CN201210291433.8 is a squarylium chemical sensor for colorimetric recognition of copper ions and its preparation method, which synthesizes a symmetrical squarylium fluorescent probe, but the detection limit of the fluorescent probe for copper ion recognition is 6 ×10 - 5 M, and selectivity among other metal ions was not studied

Method used

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  • Asymmetric squarylium cyanine colorimetric probe for identifying copper ions and application of asymmetric squarylium cyanine colorimetric probe
  • Asymmetric squarylium cyanine colorimetric probe for identifying copper ions and application of asymmetric squarylium cyanine colorimetric probe
  • Asymmetric squarylium cyanine colorimetric probe for identifying copper ions and application of asymmetric squarylium cyanine colorimetric probe

Examples

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Embodiment

[0028] (1) Synthesis of diethoxy squaraine

[0029] Weigh 2.5g (about 8.75mmol) squaraine and dissolve it in 40mL ethanol, heat to 80°C, stir with a constant temperature heating magnetic stirrer, react for 2h, stop the reaction and cool it to room temperature, and remove most of the solvent by rotary evaporation. Continue to add 40mL of ethanol to the round bottom flask, heat to 80°C, stir with a constant temperature heating magnetic stirrer, react for 1h, remove the solvent after the reaction is stopped, repeat the above steps 3 times, separate and purify with a silica gel column to obtain a colorless liquid, namely Crude product of diethoxysquaric acid.

[0030] (2) Synthesis of 3-ethyl-1,1,2-trimethyl-1H-benzo[e]indole

[0031] Weigh 1,1,2-trimethyl-1H-benzo[e]indole 1g (about 5mmol) into a round bottom flask, dissolve it in 50mL toluene, and pour N 2 Protected, and 1.5 g iodoethane (about 10 mmol) was added dropwise, heated to 120 ° C, stirred with a constant temperature...

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Abstract

The invention relates to an asymmetric squarylium cyanine colorimetric probe for identifying copper ions and application of the asymmetric squarylium cyanine colorimetric probe, and a preparation method of the asymmetric squarylium cyanine colorimetric probe comprises the following steps: synthesizing 3-ethyl-1, 1, 2-trimethyl-1H-benzo [e] indole from 1, 1, 2-trimethyl-1H-benzo [e] indole and iodoethane, synthesizing diethoxy squaric acid from squaric acid and ethanol, and synthesizing diethoxy squaric acid from 3-ethyl-1, 1, 2-trimethyl-1H-benzo [e] indole and 3-ethyl-1, 1, 2-trimethyl-1H-benzo [e] indole. The preparation method comprises the following steps: synthesizing 3-ethyl-1, 1, 2-trimethyl-1H-benzo [e] indole squaric acid hemicyanine from 3-ethyl-1, 1, 2-trimethyl-1H-benzo [e] indole, and synthesizing asymmetric double-square acid cyanine from the 3-ethyl-1, 1, 2-trimethyl-1H-benzo [e] indole squaric acid hemicyanine and 3-diethylaminophenol for selective recognition and detection of copper ions. The asymmetric squarylium cyanine chemical sensor has the beneficial effects that the asymmetric squarylium cyanine chemical sensor has the characteristics of good optical performance and high sensitivity. When the copper ions are detected and identified, the color of the solution is obviously changed, so that colorimetric detection is facilitated.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis and testing, and relates to a preparation method and application of an asymmetric squaraine colorimetric probe for identifying copper ions. Background technique [0002] Squarine is a resonance-stabilized squaraine derivative with zwitterionic characteristics. The central four-membered ring of squaraine molecule is a strong electron-withdrawing structure, which is easily attacked by nucleophiles, so that the color of squaraine dyes occurs. Visibly changed. Cyanine dye is a large π-conjugated system. This structural feature determines that its main absorption is in the visible region, and the substituents of the dye will have a certain impact on the absorption wavelength. Cyanine dyes have a methine structure, so they have a large molar extinction coefficient. There are also some deficiencies in cyanine dyes, which affect the wide application of dyes. The most concerned problem is that ...

Claims

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Application Information

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IPC IPC(8): C07D209/60C09K11/06G01N21/31G01N21/78
Inventor 李忠玉吴月晗梁倩周满徐松
Owner CHANGZHOU UNIV
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