Blue organic electrophosphorescent material iridium metal complex, preparation method thereof and organic electroluminescent device
A technology of iridium metal complexes and phosphorescent materials, which is applied in the field of organic electroluminescent materials, can solve problems such as poor blue light color purity, and achieve the effects of reducing self-quenching phenomenon, blue-shifting luminous wavelength, and good compatibility
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[0039] see figure 1 , the preparation method of the above-mentioned blue light organic electrophosphorescent material iridium metal complex, comprising the following steps:
[0040] S1. Under inert gas (at least one of nitrogen and argon, the same below), the structural formula is The compound A and the structural formula are The compound B is dissolved in the first organic solvent containing catalyst and base, and then Suzuki coupling reaction is carried out at 80-100°C for 5-15 hours. After the reaction is stopped, the reaction solution is separated and purified to obtain the structural formula: The ring metal ligand; Wherein, the molar ratio of compound A and compound B is 1:1~1:2; Reaction formula is as follows:
[0041]
[0042] S2. Under the protection of an inert gas, the cyclometal ligand and iridium trichloride trihydrate (IrCl 3 ·3H 2 O) Dissolve in a mixed solvent of 2-ethoxyethanol and water with a volume ratio of 3:1 at a molar ratio of 2:1 to 3:1 to form...
Embodiment 1
[0067] Example 1: Complex bis(3-(2',6'-difluoropyridin-3'-yl)pyridazine-N,C 2 ') Synthesis of (2-pyridyl) iridium
[0068] (1) Synthesis of 3-(2',6'-difluoropyridin-3'-yl)pyridazine
[0069]
[0070] Under nitrogen protection, 1.59g (10mmol) 3-bromopyridazine (A1), 1.59g (10mmol) 2,6-difluoropyridine-3-boronic acid (B), 40mL toluene, 10mL water, 1.61 g (5mmol) tetrabutylammonium bromide, 1.38g (10mmol) anhydrous potassium carbonate, 0.23g (0.2mmol) tetrakis (triphenylphosphine) palladium, then stirred and refluxed at 80°C for 15h. After the reaction solution was cooled to room temperature, it was extracted with dichloromethane, separated, washed with water until neutral, and dried over anhydrous magnesium sulfate. After filtration, the filtrate was distilled off the solvent under reduced pressure to obtain the crude product. Silica gel column chromatography was carried out with dichloromethane as the eluent. After drying, 1.27 g of solid was obtained, with a yield of 65....
Embodiment 2
[0091] Example 2: Complex bis(3-(2',6'-difluoropyridin-3'-yl)-6-methylpyridazine-N,C 2 ') Synthesis of (2-pyridyl) iridium
[0092] (1) Synthesis of 3-(2',6'-difluoropyridin-3'-yl)-6-methylpyridazine
[0093]
[0094] Under nitrogen protection, 3.46g (20mmol) 3-bromo-6-methylpyridazine (A2), 6.36g (40mmol) B, 80mL DMF, 20mL water, 3.22g (10mmol) tetrabutyl bromide were added to the reactor Ammonium chloride, 4.24g (40mmol) anhydrous sodium carbonate, 0.23g (0.2mmol) tetrakis(triphenylphosphine)palladium, and then stirred and refluxed at 100°C for 5h. After the reaction solution was cooled to room temperature, it was extracted with dichloromethane, separated, washed with water until neutral, and dried over anhydrous magnesium sulfate. After filtration, the filtrate was distilled off the solvent under reduced pressure to obtain the crude product. Silica gel column chromatography was carried out with dichloromethane as the eluent. After drying, 2.48 g of solid was obtained,...
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