A kind of preparation method based on boron cluster anion photochromic material
A photochromic material and anion technology, applied in the field of materials, can solve the problems of small excitation wavelength, low quantum yield, cumbersome synthesis, etc., and achieve the effects of long life of free radicals, low preparation cost, and high photosensitivity
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Embodiment 1
[0027] The preparation of several conjugated polypyridine molecules used in the present invention:
[0028] (1) Preparation of 2,4,6-tris(pyridin-4-yl)-1,3,5-triazine (TPT)
[0029] 4-cyanopyridine (6.0 g, 56 mmol) was added into a 100 mL three-necked flask and heated to 150° C. in an oil bath. Powdered NaOH (230mg, 5.6mmol) was added to the resulting liquid, and the mixture was kept at 150°C for 24h. After the reaction was completed, it was cooled to room temperature, and the solid was washed with a large amount of acetone and dissolved in 50mL of 4M hydrochloric acid. Activated carbon was then added and sonicated for 30 min. Filter the suspension with diatomaceous earth, and neutralize it with 2mol / L NaOH solution. At this time, a large amount of white precipitate will be produced. After filtering, wash it with a large amount of water and acetone alternately three times, and dry it in a 60°C oven. The product was obtained as a white solid (3.1 g, 52% yield).
[0030](2) P...
Embodiment 2
[0044] 0.624g (2mmol) of 2,4,6-tris(pyridin-4-yl)-1,3,5-triazine prepared in Example 1 was added into a 250mL round bottom flask containing 100mL ultrapure water, and then Adjust the pH to 0 with dilute hydrochloric acid, and stir ultrasonically at room temperature (25°C) until the solution is completely clear and transparent to obtain solution A; will contain 0.563g (3mmol) Na 2 B 12 h 12 50mL aqueous solution of the solution was added to solution A, and a light yellow precipitate was rapidly formed, and the stirring was continued for 30 minutes, and the precipitate was obtained by filtration, and washed three times with a small amount of water and ethanol respectively. The target product BOFs-TPT-H was obtained by vacuum drying. The excitation wavelength threshold for discoloration of the obtained target product is roughly between 460nm and 520nm, the photoresponse time is 3s, and the lifetime of free radicals is permanent at room temperature, and the free radicals disappe...
Embodiment 3
[0046] 0.624g (2mmol) of 2,4,6-tris(pyridin-3-yl)-1,3,5-triazine prepared in Example 1 was added into a 250mL round bottom flask containing 100mL of ultrapure water, and then Adjust the pH to 0 with dilute hydrochloric acid, and stir ultrasonically at room temperature (25°C) until the solution is completely clear and transparent to obtain solution A; will contain 0.563g (3mmol) Na 2 B 12 h 12 50mL aqueous solution of the solution was added to solution A, and a light yellow precipitate was rapidly formed, and the stirring was continued for 30 minutes, and the precipitate was obtained by filtration, and washed three times with a small amount of water and ethanol respectively. The target product was obtained by vacuum drying. The excitation wavelength threshold for discoloration of the obtained target product is approximately between 460nm and 520nm, the photoresponse time is 10s, and the lifetime of free radicals is permanent at room temperature, and the free radicals disappea...
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