Erasable fluorescent material based on external stimulation unlocking
A technology of fluorescent materials and fluorescent dyes, applied in the direction of luminescent materials, organic chemistry, chemical instruments and methods, etc., can solve the problems of erasable and writable functions without encryption functions, etc.
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Embodiment 1
[0051]Weigh 272.41 mg (1 mmol) of 3-hexyl-2-(4-formylphenyl)thiophene, add it to a 50 mL round-bottomed flask with 15 mL of absolute ethanol, raise the temperature to 50° C., and make 3-hexyl-2-( 4-formylphenyl)thiophene was completely dissolved.
[0052] Add 79.27mg (1.2mmol) of malononitrile and keep the reaction at 50°C for 5h.
[0053] After the reaction was complete, the solvent was removed by vacuum rotary evaporation, and the mixed solvent of petroleum ether and ethyl acetate with a volume ratio of 20:1 was used as the eluent to separate and purify the crude product by column chromatography to obtain 2-(4-(3- Hexylthiophene-2-)benzylidene)malononitrile yellow powder solid.
[0054] 1 H NMR (600 MHz, CDCl 3 ) δ = 7.90 (d, J = 8.6 Hz, 2H), 7.69 (s, 2H),7.68 (s, 1H), 7.34 (d, J = 3.7 Hz, 1H), 6.82 (d, J = 3.6 Hz, 1H), 2.85 (t, J = 7.6 Hz, 2H), 1.70 (dd, J = 15.2, 7.6 Hz, 2H), 1.40 – 1.30 (m, 6H), 0.90 (t, J = 7.0 Hz, 3H).
[0055] 13 C NMR (151 MHz, CDCl 3 )...
Embodiment 2
[0058] The yellow powder solid prepared in Example 1 was recrystallized with ethanol to obtain 240 mg of yellow crystalline grains in the α crystal state, with a yield of 75%, which was stored frozen in a refrigerator.
[0059] The X-ray diffraction pattern of the yellow crystals is as follows figure 1 , the appearance of sharp diffraction peaks indicates that it is a crystalline sample, which is defined as the α-crystalline state.
[0060] The fluorescence emission spectrum of the α-crystalline fluorescent material under the excitation of 365nm blue light is as follows: figure 2 As shown, its maximum emission peak is located at 546nm, and the fluorescence quantum yield is 3.21%, which is manifested as yellow fluorescence.
Embodiment 3
[0062] The α-crystalline fluorescent material prepared in Example 2 was ground in a mortar and then characterized by X-ray diffraction. The spectrum is as follows: image 3 shown, although with figure 1 Compared with the reduction of diffraction peaks, but still in crystalline state, it is defined as β crystalline state.
[0063] The fluorescence emission spectrum of the β-crystalline fluorescent material under the excitation of 365nm blue light is as follows: Figure 4 , the maximum emission peak is located at 510nm, and the fluorescence quantum yield is 4.18%, showing green fluorescence.
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