Synthesis and Application of Novel Cyclometallic Platinum Complex Dual Emission Materials
A platinum complex, cyclometal technology, applied in the field of organic electroluminescent materials
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Embodiment 1
[0025] Synthesis of compound 3
[0026] Into a 250 mL three-necked flask, compound 1 (5.0 g, 31.66 mmol), compound 2 (7.5 g, 31.66 mmol), tetrakistriphenylphosphine palladium (730 mg, 0.63 mmol), K 2 CO 3 [2M] 126 mL and tetrahydrofuran 100 mL, the mixture was stirred and refluxed at 80°C for 24 h under the protection of nitrogen. After the reaction solution was cooled to room temperature, the solvent was removed under reduced pressure, dichloromethane (100 mL) was added to dissolve the residue, the organic phase was washed with saturated brine (3×150 mL), anhydrous MgSO 4 Dry, filter, and remove the solvent under reduced pressure; the residue was washed with petroleum ether / dichloromethane ( V / V ; 2:1) as the eluent and purified by column chromatography to obtain the white solid product 3 (5.4 g, yield: 64%). 1 H NMR (400 MHz, CDCl 3 ) δ 8.75 (d, J= 2.1 Hz, 1H), 8.01 (td, J= 8.9, 6.6 Hz, 1H), 7.88 (dd, J= 8.5, 2.4 Hz, 1H), 7.67 (dd, J= 8.5,1.6 Hz, 1H), 7.05-6.96 ...
Embodiment 2
[0042] In order to reveal the effect of the introduced oxygen atoms on the molecular configuration and further analyze the effect of the configuration change on the physical and chemical properties of the molecule, we combined (2Fppy-DPS-Cz)Pt(acac) and (2Fppy-O-DPS-Cz)Pt( acac) were dissolved in chloroform and chloroform / methanol mixed solutions, and the single crystal of the complex was obtained by slow evaporation, and the relevant parameters of the single crystal structure were detected and analyzed. Such as figure 1 As shown, the dihedral angle of the two planes connected by the sulfur atom on the sulfone of (2Fppy-DPS-Cz)Pt(acac) is 77.3 º , the stacking intermolecular forces are mainly S-H…π and C-H…π, where the distance between the S atom and the π plane is 3.116 Å, and the distance between the C atom and the π plane is 3.454 Å. In particular, in the molecular packing structure, we can also see the multi-molecular self-assembled microcavity structure. In this microcav...
Embodiment 3
[0047] In order to study the difference in electrochemical properties between the complexes and explore the energy level changes of both HOMO and LUMO, we tested the redox potential of the complexes by cyclic voltammetry. Such as Figure 4 As shown, both complexes exhibit irreversible redox potentials in the range of -1.5-2.0 V. According to the oxidation potential and reduction potential values, the HOMO and LUMO of (2Fppy-DPS-Cz)Pt(acac) and (2Fppy-O-DPS-Cz)Pt(acac) were calculated as -5.8 / -5.66 eV and -3.49 / -3.49 eV.
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