Method for determining content of potassium tert-butoxide
A technology of potassium tert-butoxide and content, which is used in material excitation analysis, fluorescence/phosphorescence, etc., can solve the problems of long time and complicated operation, and achieve the effect of simple operation, high sensitivity and high accuracy.
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Embodiment 1
[0019] The preparation of embodiment 1 salicylaldehyde azine
[0020] In a 250mL three-necked flask equipped with a thermometer, a stirrer and a reflux condenser, 2.44g (0.02mol) of salicylaldehyde, 100mL of absolute ethanol and 0.63g (0.01mol) of hydrazine hydrate were added successively, and heated to reflux for 2 hours. After cooling, a large amount of yellow precipitates were produced. Add 1mL of 30% hydrochloric acid, heat to dissolve and reflux for 2h, use the residual heat of the oil bath to cool slowly, and filter to obtain the crude product of needle-shaped yellow crystals. Put the crude product into a 250mL single-necked flask, add 200mL of absolute ethanol, heat and reflux in an oil bath for 2 hours, stop heating, and slowly cool down the reflux liquid using the residual temperature of the oil bath for recrystallization, and filter to obtain salicylaldehyde azine Yellow needle-like crystals, The yield was 89%.
[0021] The melting point of salicylaldehyde azine is ...
Embodiment 2
[0025] Embodiment 2 Potassium tert-butoxide is measured
[0026] Salicylaldehyde azine and potassium tert-butoxide were formulated into 13 kinds of ethanol solutions with different concentrations, wherein the concentration of salicylaldehyde azine was 1.0×10 -4 M, the concentration of potassium tert-butoxide is 0~32.0×10 -4 M. The fluorescence intensity changes of these 13 solutions were measured under the condition that the excitation wavelength was 385nm, as figure 2 shown. The results showed that potassium tert-butoxide had a good fluorescence enhancement effect on salicylaldehyde azine, which gradually increased with the concentration of potassium tert-butoxide.
[0027] When the concentration of potassium tert-butoxide is 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0×10 -4 M, the fluorescence intensity of these 8 systems increases linearly with the increase of concentration, and the linear relationship between fluorescence intensity and potassium tert-butoxide concentration...
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