A kind of multi-stimuli-responsive fluorescent-multicolor luminescent material and its preparation method and application
A luminescent material, responsive technology, applied in luminescent materials, fluorescence/phosphorescence, material analysis by optical means, etc., can solve problems such as limiting the application process of luminescent materials, and achieve easy large-scale commercialization, simple synthesis, raw materials Inexpensive and accessible effects
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Embodiment 1
[0031] A fluorescent-multicolor luminescent material with multi-stimuli responsiveness, its structural formula is shown in the following formula:
[0032]
[0033] Concrete preparation steps are as follows:
[0034] Hexafluorobenzene (1 mmol, 0.186 g), 4-mercaptopyridine (9 mmol, 1 g) were added to DMF solvent (30 ml), and CeCO 3 (10 mmol, 3.25 g), reacted at 70°C for 72 hours under a nitrogen atmosphere, and stopped the reaction; when it was cooled to room temperature, a large amount of distilled water was added to produce an orange precipitate, and after filtration, column chromatography (volume ratio, ethyl acetate / petroleum ether =1:2 ) to obtain a hexapyridyl-substituted benzenesulfide compound, which is designated as compound 1. The hydrogen spectrum and carbon spectrum of compound 1 are as follows figure 1 and figure 2 Shown: 1 H NMR (400 MHz, DMSO, 298 K): δ = 7.06 (m, 12H), 8.28 (m, 12H). 13 CNMR (100 MHz, DMSO, 298 K): δ = 124.21, 130.38, 141.62, 150.63.
Embodiment 2
[0035] Example 2 (solvent-induced aggregation and luminescent phenomenon)
[0036] Get the DMF solution of compound 1 gained in example 1, compound 1 concentration in DMF is 10 -4 M, by adding different volumes of methanol to it, the volume fraction of methanol (the volume ratio of methanol to DMF+methanol) was 0, 20%, 40%, 60%, 80%, 90%, respectively, and the concentration of compound 1 was kept at 10 -5 M. Take 3 mL respectively in a cuvette, use 365 nm as the excitation wavelength, and detect the emission spectrum in the wavelength range of 390 nm to 700 nm. The maximum emission wavelength is 515 nm, and green light is emitted at this time. By collecting different volume fractions to record its emission spectrum, the obtained emission spectrum is as follows image 3 shown in . Depend on image 3 It can be seen that the main emission peak of compound 1 in DMF is at 410 nm, with the addition of methanol, the absorption peak at 410 nm decreases, and a new absorption peak ...
Embodiment 3
[0037] Example 3 (acid-base induced luminescence transition)
[0038] Get the DMF solution of compound 1 obtained in example 1, concentration 10 -5 M. The solution was adjusted to acidity by adding HCl (12 M) dropwise thereto, at which point the pH was 6. Take 3 mL in a cuvette, use 365 nm as the excitation wavelength, and detect the emission spectrum in the wavelength range of 390 nm to 700 nm. The maximum emission wavelength is 540 nm, which emits yellow light. Continue to add sodium hydroxide dropwise to the yellow light solution to adjust to alkalinity, at this time the pH is 8. Take 3 mL in a cuvette, use 365 nm as the excitation wavelength, and detect the emission spectrum in the wavelength range of 390 nm to 600 nm. The maximum emission wavelength is 410 nm, and blue light is emitted at this time. The resulting emission spectrum is as Figure 4 shown in .
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