A kind of multifunctional fluorescent probe and preparation method and application
A fluorescent probe, multifunctional technology, applied in the field of analytical chemistry for metal ion detection, can solve the problems of high cost, complicated synthesis, low efficiency, etc., and achieve the effect of strong anti-interference ability, good selectivity and mild reaction conditions
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[0034] A method for preparing a multifunctional fluorescent probe, the specific steps are as follows: in anhydrous ethanol solution, 4-formyl triphenylamine and 2-hydrazinobenzothiazole are heated and refluxed in anhydrous ethanol to generate an aldoamine condensation reaction; After the reaction was completed, it was cooled to room temperature, and the precipitate was filtered, washed with absolute ethanol for several times, and dried for purification to obtain a multifunctional fluorescent probe.
[0035] The synthetic route of the fluorescent probe is as follows:
[0036]
[0037] Further, the molar ratio of the 4-formyl triphenylamine to the 2-hydrazinobenzothiazole is 1:1.2.
[0038] Further, the heating and refluxing time is 3h.
[0039] Application of a multifunctional fluorescent probe, the fluorescent probe can detect Cu in an acetonitrile solution system 2+ , Fe 3+ identified applications.
[0040] Further, the identification method is specifically as follows:...
Embodiment 1
[0043] Example 1: Identification of Cu 2+ , Fe 3+ and Zn 2+ The preparation method of the multifunctional fluorescent probe
[0044]The specific steps are as follows: 4-formyl triphenylamine (100 mg, 0.366 mmol) was dissolved in absolute ethanol (15 mL), 2-hydrazinobenzothiazole (73 mg, 0.439 mmol) was added, and the reflux was stirred for 3 h. After the reaction was completed, After cooling to room temperature, the precipitate was filtered and washed with absolute ethanol several times to obtain a pale yellow product with a yield of 73% after drying.
[0045] 1 H NMR (600MHz, DMSO-d 6 )δ8.06(s,1H),7.71(s,1H),7.59–7.55(m,2H),7.38–7.32(m,5H),7.28(t,J=7.7Hz,1H),7.14–7.05 (m,8H),6.99–6.95(m,2H).
Embodiment 2
[0046] Example 2: Probe to Cu in acetonitrile solution system 2+ , Fe 3+ identification applications
[0047] Prepare the concentration of 10 -2 M's Al 3+ , Fe 3+ ,Co 2+ ,Mg 2+ , Ni 2+ , Ag + ,Cu 2+ ,Pb 2+ ,Mn 2+ , Zn 2+ ,K + , Cd 2 + ,Hg 2+ ,Cr 3+ ,Ca 2+ ,Na + aqueous solution.
[0048] Prepare the acetonitrile solution of the probe prepared in Example 1: Dilute the probe solution (2.5 mM, 100 μL) with acetonitrile to a total volume of 10 mL, add the above prepared metal ion solution (10 -2 M, 10 μL), mix well. Use UV spectrophotometer and fluorescence spectrophotometer to measure the effect of the addition of different ions on the solution, such as figure 1 and figure 2 shown. exist figure 1 , it can be seen that only Cu 2+ The addition of , can make the probe solution appear a new absorption peak at 505nm, and the solution changes from colorless to red; figure 2 , it can be seen that only Fe 3+ The addition of , can make the probe solution appea...
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