Preparation method and use of N-(1-naphthoyl)-N'-[rhodamine B-9-(2-benzoyl)]hydrazine
A technology of naphthoyl chloride and hydrazide, which is applied in the application field of chemical sensing technology, and can solve problems such as application limitations, poor selectivity, and susceptibility to interference
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Embodiment 1
[0043] Method 1 Synthesis of target compound I:
[0044] Add 1.00g (2.09 mmol) rhodamine B (in the form of hydrochloride) and 2 mL of phosphorus oxychloride into a 100 mL flask, reflux at 100°C for 2-10 hours, spot the plate to detect the progress, until the raw materials are completely reacted, Turn off heat. Yield: 81.3%. Alternatively, rhodamine B and excess hydrazine hydrate are refluxed in a polar solvent to prepare rhodamine B hydrazide. Add 0.50 g (2.62 mmol) of 1-naphthoyl chloride to 0.91 g (2.0 mmol) of rhodamine B hydrazide in tetrahydrofuran, add 8 mL of triethylamine, heat, reflux, and monitor the progress of the reaction by TLC. After 2-26 hours, the heating was stopped. After the reaction mixture was cooled, it was poured into an ice-water mixture, extracted with dichloromethane to obtain an organic phase, dried overnight with anhydrous magnesium sulfate, and spin-dried. The obtained crude product was purified by column chromatography using cyclohexane and et...
Embodiment 2
[0046] Method two synthetic target compound I:
[0047]Add 1.00 g (2.2 mmol) of rhodamine B acid chloride to a solution of 0.41 g (2.2 mmol) of 1-naphthoic hydrazide in tetrahydrofuran, add 8 mL of triethylamine, heat, reflux, and monitor the progress of the reaction by TLC. After 2-26 hours, the heating was stopped. After the reaction mixture was cooled, it was poured into an ice-water mixture, extracted with dichloromethane to obtain an organic phase, dried overnight with anhydrous magnesium sulfate, and spin-dried. The obtained crude product was purified by column chromatography using cyclohexane and ethyl acetate as developing solvents. Obtained 0.96 g of the target product as an off-white solid with a yield of 78.6%.
Embodiment 3
[0049] Response detection of compound I silica gel plate support sheet to volatile organic acid mist:
[0050] In order to explore the spectral properties of compound I and its response to acid mist, a silica gel plate with a size of 20 mm × 20 mm (coated plate thickness 0.2-0.25 mm) was prepared in CH with a concentration of 1.0 mg / 10 mL of compound I 2 Cl 2 Soak in the solution, then place in high vacuum, dark, and dry at room temperature for 24-48 hours. The fluorescence detection of acid vapor is carried out in a container with a volume of 100 mL. The silica gel plate loaded with compound I is placed in the center of the container, and then 10 microliters of different volatile organic acids are dripped into the bottom with a micro-syringe (the types of acids include : formic acid, acetic acid, and phosphorus oxychloride), take it out after 10 seconds, and compare the experimental silica gel plate with the blank silica gel plate, showing a change from light pink to deep pi...
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