Carbon anionic photo base generator and preparation method thereof
A technology of photobase generator and carbanion, which is applied in the field of photocuring, can solve the problems of low quantum yield and weak catalytic activity, and achieve high quantum yield, simple synthesis method and wide application range
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Embodiment 1
[0036] refer to figure 1 For the synthetic route shown, add 0.27 g (1 mmol) of 2-thioxanthone acetic acid to a single-necked flask at 25° C., add dropwise 25% tetraethylammonium hydroxide aqueous solution, stir in the dark, and monitor the pH of the reaction solution The dropwise addition was stopped when the value was 7.2, and a brown solid was obtained after vacuum drying, which was the photobase generator of the present invention (yield 98%).
[0037] The nuclear magnetic resonance spectrum figure of gained photobase generator is shown in figure 2 ;in, 1 H NMR (400 MHz, DMSO) δ 8.63–7.54 (m, 7H), 3.50 (s, 2H), 3.25 (m, 8H), 1.25 (t, 12H).
[0038] After the gained photobase generator illuminates 30 seconds (not photolysis is complete), the carbanion that produces is under the effect of a small amount of water in the deuterated reagent, and the carbanion part is protonated as image 3 shown; among them 1 H NMR (400 MHz, DMSO) δ8.63–7.54 (m, 7H), 3.50 (s, 0.67H), 3.25 (m...
Embodiment 2
[0043] refer to figure 1 For the synthetic route shown, add 0.283 g (1 mmol) of 2-thioxanthone isopropionic acid to a single-necked flask at 25 ° C, add dropwise 10% aqueous tetrabutylammonium hydroxide solution, stir in the dark, and monitor the pH of the reaction solution When the value was 7.3, the dropwise addition was stopped, and a brown solid was obtained after vacuum drying, which was the photobase generator of the present invention (yield 97%).
Embodiment 3
[0045] refer to figure 1 For the synthetic route shown, add 0.252 g (1 mmol) of 2-azanthone acetic acid into a single-necked flask, add dropwise 10% tetrabutylammonium hydroxide aqueous solution, and stir in the dark, and stop the dropwise addition when the pH value of the reaction solution is monitored to be 7.1 , to obtain a brown solid after vacuum drying, which is the photobase generator of the present invention (yield 97%).
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