Construction of chiral liquid crystal phosphorescent material based on cyclometalated platinum complex and application of chiral liquid crystal phosphorescent material in circular polarizer
A phosphorescent material, platinum complex technology, applied in liquid crystal materials, luminescent materials, platinum group organic compounds, etc., can solve the problems of low luminous efficiency, small luminescence asymmetry factor, and few structural types, and achieve excellent performance, strong Intermolecular interaction, the effect of good planar structure
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Embodiment 1
[0023] Taking the compound S-Pt as an example, the preparation methods of two chiral platinum complexes are described
[0024]
[0025] Synthesis of compound 2
[0026] At 0°C, to compound 1 (7.0 g, 53.8 mmol) and triphenylphosphine (21.10 g, 80.7 mmol) in dichloromethane solution (200 mL) was slowly added and N - Bromosuccinimide (12.40 g, 69.9 mmol), then the reaction system was protected from light and stirred at room temperature for 24 h. After the reaction was completed, the organic layer was washed with water (3×200 mL), dried, and evaporated under reduced pressure to remove the solvent. The residue was separated by column chromatography using petroleum ether: dichloromethane (V:V = 4:1) as the eluent to obtain 7.20 g of light yellow liquid with a yield of 69%. 1 H NMR (300 MHz, CDCl 3 ) δ 4.14 (q, J = 6.6 Hz, 1H), 1.94-1.73(m, 2H), 1.71 (d, J = 6.6 Hz, 3H), 1.53-1.35 (m, 2H), 1.35-1.24 (m, 6H), 0.89(t, J = 6.7 Hz, 3H).
[0027] Synthesis of compound 3
[0...
Embodiment 2
[0035] UV-Vis absorption spectra of compounds S-Pt and R-Pt.
[0036] Compounds R-Pt and S-Pt were dissolved in DCM to form 10 -5 M solution, test the UV-Vis absorption spectrum of its solution. Depend on figure 1 It can be seen that the UV-Vis absorption spectra of compounds S-Pt and R-Pt in solution roughly have two absorption peaks: the absorption peak at the short wavelength (250 nm) is mainly attributed to the π-π* transition absorption of the molecule; (>300nm) absorption peaks are assigned to the absorption peaks of metal-to-ligand charge transfer transitions.
Embodiment 3
[0038] Photoluminescence spectra of compounds S-Pt and R-Pt.
[0039] Compounds R-Pt and S-Pt were dissolved in DCM to form 10 -5 M solution, test the photoluminescence spectrum of its solution. Depend on figure 2 It can be seen that the photoluminescence spectra of compounds S-Pt and R-Pt in solution have roughly three emission peaks: Among them, the emission peaks at 500 nm and 540 nm are mainly attributed to the charge transfer transition between the metal and the ligand; The emission peak around 580 nm is mainly attributed to the dimer emission peak caused by the interaction between molecules.
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