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Ethylenediamine schiff base type sweat fingerprint fluorescent reagent, synthesis and use thereof

A technology of ethylenediamine Schiff base and fingerprint, applied in application, fluorescence/phosphorescence, preparation of imino compounds, etc., can solve the problems of poor application, high price, loss, etc. The method is simple and the effect of reducing requirements

Inactive Publication Date: 2009-03-11
JIANGSU POLICE INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dyeing method is easy to produce toxic and harmful gases, and dyes such as ninhydrin and rhodamine 6G pollute the object, which is undoubtedly a great loss to some cultural relics such as collected books, calligraphy and paintings, and precious stamps.
In recent years, due to the development and application of multi-band light source technology, the discovery and extraction rate of fingerprints on relevant objects in crime scenes has been greatly improved, but the fluorescent agents necessary for the use of this technology, such as DFO, Hungarian Red, etc. are currently basically dependent on foreign imports, and the price is quite expensive, which has led to the lack of good application of this promising technical means in grassroots public security organs.

Method used

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  • Ethylenediamine schiff base type sweat fingerprint fluorescent reagent, synthesis and use thereof
  • Ethylenediamine schiff base type sweat fingerprint fluorescent reagent, synthesis and use thereof
  • Ethylenediamine schiff base type sweat fingerprint fluorescent reagent, synthesis and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1: Bis-(4,5-diazafluoren-9-ketone) vinyl acetal diamine Schiff base

[0044] (1) Synthetic route

[0045]

[0046] (2) Synthesis steps

[0047] Accurately weigh 3.64g of 4,5-diazafluorenone, measure 100mL of tetrahydrofuran (THF) with a graduated cylinder, put it in a beaker, and stir with a glass rod. Place the product in a three-necked bottle, add 5.0g of catalyst anhydrous sodium sulfate, then add 7mL of 70% ethylenediamine, react for 4min-5min, then pass nitrogen into the three-necked bottle to remove the air in the device, and then adjust the nitrogen The stream keeps its speed steady at 1 bubble per second. The temperature of the heating water bath was kept at 40° C. and refluxed for 1 hour to obtain the crude product as a light yellow solid. Finally, it was recrystallized with absolute ethanol. The obtained product was dried in a constant temperature drying oven at 80° C. for about 1 day to obtain light yellow bis-(4,5-azafluoren-9-one)ethylenediam...

Embodiment 2

[0057] Embodiment 2: bis-(2-hydroxyphenylmethylene) vinyl acetal diamine Schiff base

[0058] (1) Synthetic route

[0059]

[0060] (2) Synthesis operation

[0061] Accurately weigh 1.6 g of salicylaldehyde, measure 100 mL of tetrahydrofuran (THF) with a graduated cylinder, place it in a beaker, and stir with a glass rod. Place the product in a three-necked bottle, add 5.0g of catalyst anhydrous sodium sulfate, then add 7mL of 70% ethylenediamine, react for 4min-5min, then pass nitrogen into the three-necked bottle to remove the air in the device, and then adjust the nitrogen flow Keep it steady at 1 bubble per second. Keep the temperature of the heating water bath at 40°C and reflux for 0.5h to obtain the crude product as a yellow solid; finally recrystallize with absolute ethanol. The obtained product was dried in a constant temperature drying oven at 80° C. for about 1 day to obtain a yellow bis-(2-hydroxyphenylmethylene)ethylenediamine solid with a yield of 88%.

[...

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Abstract

The invention discloses an ethylene diamine Schiff base sweat latent fingerprint fluorescent developing agent and synthesis and application thereof. The structure of the compound is as shown in a formula (I); and the compound mainly comprises a bi-(4, 5-di-azafluorene-9-ketone) shrunk ethylene diamine Schiff base fingerprint fluorescent developing agent and a bi-(2-hydroxybenzoic methylene) shrunk ethylene diamine Schiff base fingerprint fluorescent developing agent. The compound shrunk ethylene diamine Schiff base fingerprint fluorescent developing agent has good fluorescent stability, high fluorescence intensity and wide spectral range of exciting light, and can be all excited to emit fluorescent light and reveal fingerprints within the range of wavelength light between 365 and 550 nanometers. Because the ethylene diamine Schiff base sweat latent fingerprint fluorescent developing agent can be all excited to emit the fluorescent light and reveal the fingerprints within the range of the wavelength light between 365 and 550 nanometers, the fluorescence performance of the ethylene diamine Schiff base sweat latent fingerprint fluorescent developing agent is superior to that of DFO and WOP fluorescent developing agents at abroad, thereby the ethylene diamine Schiff base sweat latent fingerprint fluorescent developing agent reduces the requirement on an excitation light source when used and is favorable for being promoted and used in actual combat compartments of grass-root units.

Description

technical field [0001] The invention belongs to the technical field of criminal science, and in particular relates to the visualization of sweat latent fingerprints on related objects in crime scenes. Background technique [0002] Fingerprints are one of the most convincing pieces of evidence presented to a court, linking criminals to physical evidence found at a crime scene. Therefore, the scientific and correct discovery, extraction, and display of fingerprints play an important role in carrying out investigations and punishing criminals. Because fingerprints on many physical evidence found at crime scenes are invisible to the naked eye, forensic science laboratories around the world are researching and applying various techniques to make latent fingerprints visible for analysis. At present, the traditional visualization methods of sweat-latent fingerprints on relevant objects at the crime scene mainly include fumigation method, silver nitrate method, ninhydrin method, et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D471/04C07C251/24C07C249/02A61B5/117G01N21/64A61B5/1172
Inventor 刘景宁徐同祥陈春涛杨蔚韩艳丽
Owner JIANGSU POLICE INST
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