Ligand isomeric plane chiral Pt (II) complex and preparation method thereof
By using a simple method to prepare ligand heterogeneous planar chiral Pt(II) complexes, novel planar chirality is constructed using inconsistent ligand structures, solving the chiral resolution problem and achieving efficient red circularly polarized light emission, which is suitable for red CP-OLEDs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-19
- Publication Date
- 2026-04-03
AI Technical Summary
The existing chiral Pt(II) complexes have complicated synthesis steps, low yields, are difficult to separate, and have poor luminescence performance, which limits their application in CP-OLEDs.
Two different 2-phenylpyridine derivatives were reacted with K2PtCl4 to generate Pt(II) complex intermediates, which were then reacted with (S)/(R)-4-isopropylthiazoline-2-sulfur to prepare ligand isomeric chiral Pt(II) complexes with single chirality. Novel chiral complexes were constructed by utilizing the inconsistency of ligand structures.
It achieves efficient red circularly polarized light emission, solves the problem of chiral separation, and provides excellent chiral optical properties, making it an ideal material for preparing red CP-OLEDs.
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Figure CN121779458A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of chiral metal complex luminescent materials technology, specifically relating to a ligand isoform chiral Pt(II) complex and its preparation method. Background Technology
[0002] How to efficiently obtain chiral luminescent systems and effectively improve and control their luminescence performance is a challenging problem in the field of CPL materials. Combining chiral Pt(II) complexes with phosphorescent Pt(II) complexes to prepare highly efficient luminescent chiral Pt(II) complexes has always been an important direction in Pt(II) complex research. Since Pt(II) complexes with d8 electron configuration have a square planar geometry, once the planar structure is twisted or destroyed, the coupling between the metal center and the ligand is weakened, which will greatly reduce the luminescence of the Pt(II) complex.
[0003] Currently, there are two main methods for constructing chiral Pt(II) complexes. The first is metal coordination-induced chiral formation. Due to steric hindrance overlap, the planar structure of the Pt(II) complex is distorted, directly leading to luminescence quenching. These complexes are characterized by complex synthesis and difficulty in chiral resolution. The second method involves introducing chiral ligands to obtain chiral Pt(II) complexes. Pt(II) complexes synthesized by introducing axial chiral, spirocyclic, and planar chiral ligands have their chiral centers located on chromophores, thus achieving enhanced chiral signals and increased CPL asymmetry factors, which has led to extensive research. However, compared to chiral Pt(II) complexes with coordination-induced configurational distortion, these chiral Pt(II) complexes show a slight improvement in quantum yield, but chiral resolution remains difficult. Currently, a small number of chiral Pt(II) complexes have been successfully applied to CP-OLEDs, but the device performance is poor. Regardless of whether chirality is induced by metal coordination or by introducing chiral ligands to synthesize chiral platinum complexes, their ΦP (radical spectral density) is generally low. These complexes share a common characteristic: the platinum ion is too close to the twisted chiral center, resulting in energy loss in the excited state. In recent years, binuclear planar chiral Pt(II) complexes with a double-layer sandwich structure have been extensively studied. Because their chromophore platinum atom is located at the center of planar chirality and maintains a rigid planar quadrilateral coordination, they achieve ultra-high quantum yields and large asymmetry factors, making them potential candidates for CP-OLEDs. However, the chiral resolution of these complexes is difficult, and they often have two identical cyclic metal ligands, limiting the diversity of their phosphorescent emission wavelengths. For the synthesis of ligand-isomeric binuclear planar chiral Pt(II) complexes, there have always been many problems such as cumbersome synthetic steps, low yields, difficult purification, and difficulty in resolution. Therefore, constructing binuclear planar chiral Pt(II) complexes with ligand isomers remains a significant challenge. Summary of the Invention
[0004] In view of this, the present invention aims to provide a ligand isomeric chiral Pt(II) complex and its preparation method.
[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a ligand isomeric chiral Pt(II) complex, which has one of the following structures: .
[0006] This invention also provides a method for preparing the above-mentioned ligand isomeric chiral Pt(II) complex, comprising the following steps: Two different 2-phenylpyridine derivatives were reacted with K2PtCl4 to obtain Pt(II) complex intermediate A and Pt(II) complex intermediate B, respectively. Pt(II) complex intermediate A and Pt(II) complex intermediate B were reacted together with (S) / (R)-4-isopropylthiazoline-2-sulfur to obtain a single-chiral ligand isomeric chiral Pt(II) complex.
[0007] Preferably, the 2-phenylpyridine derivative has one of the following structures: .
[0008] Preferably, the preparation method is as follows: S1. Two different 2-phenylpyridine derivatives were dissolved in a mixed solvent with K2PtCl4 and reacted under nitrogen. After the reaction was completed, the mixture was washed and extracted with dichloromethane and water. The organic phase was then dried to obtain Pt(II) complex intermediate A and Pt(II) complex intermediate B. S2. Pt(II) complex intermediate A, Pt(II) complex intermediate B, and (S) / (R)-4-isopropylthiazoline-2-thiosulfate were dissolved in dichloromethane solution and K2CO3 was added. The mixture was then stirred under nitrogen protection. After the reaction was completed, the mixture was dried and purified to obtain a single-chiral ligand isomeric chiral Pt(II) complex.
[0009] Preferably, the molar ratio of 2-phenylpyridine derivative to K2PtCl4 in S1 is 2:1.
[0010] Preferably, the mixed solvent in S1 is a mixture of 2-ethoxyethanol and water in a volume ratio of 3:1.
[0011] Preferably, the stirring reaction in S1 is carried out at a temperature of 85°C for 12 hours.
[0012] Preferably, anhydrous sodium sulfate is used to remove moisture from the organic phase in S1.
[0013] Preferably, the molar ratio of Pt(II) complex intermediate A, Pt(II) complex intermediate B, and (S) / (R)-4-isopropylthiazoline-2-sulfur in S2 is 1:1:2.
[0014] Preferably, the stirring reaction temperature in S2 is 50°C and the time is 24 h.
[0015] This invention also provides the application of the above-mentioned ligand isomeric chiral Pt(II) complex in achieving efficient red circularly polarized luminescence under solid powder conditions.
[0016] In this invention, (II) represents the valence state of platinum. Platinum has zero, divalent, and tetravalent valences, and (II) indicates that its valence state is divalent.
[0017] It contains at least the following beneficial technical effects: This invention discloses a simple method for synthesizing ligand-isomeric planar chiral Pt(II) complexes. It aims to construct a series of novel planar chiral complexes induced by coordination using the planar coordination configuration of simple binuclear Pt(II) complexes, and to enrich their luminescent properties by utilizing the inconsistency between the left and right ligand structures. The introduction of chiral bridging ligands successfully solves the problem of chiral resolution, enabling a fixed chiral correlation between the point chirality of the bridging ligand and the planar chirality of the coordination plane. These complexes possess relatively simple molecular structures and excellent chiral optical properties, making them ideal materials for preparing red CP-OLEDs and potentially applicable in novel energy-saving materials and chiral catalysis. Attached Figure Description
[0018] Figure 1 The complexes prepared in Examples 1 and 2 of this invention are at a concentration of 3.0 × 10⁻⁶. -5 mmol / dm 3 The absorption spectrum in toluene solution.
[0019] Figure 2 The photoluminescence spectra of the complexes prepared in Examples 1 and 2 of this invention in solid powder form are shown.
[0020] Figure 3 The complexes prepared in Examples 1 and 2 of this invention are at a concentration of 3.0 × 10⁻⁶. -5 mmol / dm 3 The emission spectrum in toluene solution.
[0021] Figure 4 The photoluminescence spectra of the complexes prepared in Examples 1 and 2 of this invention in the 5% PMMA-doped thin film state are shown.
[0022] Figure 5The phosphorescence lifetime of the complexes prepared in Examples 1 and 2 of this invention in solid powder form.
[0023] Figure 6 The phosphorescence lifetime of the complexes prepared in Examples 1 and 2 of this invention in the 5% PMMA-doped thin film state is given.
[0024] Figure 7 This is a high-performance liquid chromatography (HPLC) of the complex in Example 1 of the present invention.
[0025] Figure 8 This is a high-performance liquid chromatography (HPLC) of the complex in Example 2 of the present invention.
[0026] Figure 9 The phosphorescence quantum yield of the complexes in solid powder state in Examples 1 and 2 of this invention is given.
[0027] Figure 10 The circular polarization spectra of the complexes in solid powder form in Examples 1 and 2 of this invention are shown.
[0028] Figure 11 The complexes in Examples 1 and 2 of this invention were at a concentration of 3.0 × 10⁻⁶. -5 mmol / dm 3 Circular dichroism in toluene solution. Detailed Implementation
[0029] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention. The invention will now be described with reference to specific embodiments. It should be noted that these embodiments are merely descriptive and do not limit the invention in any way.
[0030] Example 1: Complex ( R , Sp , R ) / ( S , Rp , S Preparation of )-PtL1L2 The reaction formula is as follows: S1. 2-(2,4-difluorophenyl)pyridine (0.38 g, 2.00 equivalent, 2.00 mmol) and K2PtCl4 (0.41 g, 1.00 equivalent, 1.00 mmol) were dissolved in 32 mL of a 2-ethoxyethanol / water (3:1, volume ratio) mixed solvent. The mixture was stirred at 85 °C for 12 hours under nitrogen protection. After the reaction was completed, the system was cooled to room temperature. The reaction solution was concentrated and washed with dichloromethane and water. The organic phase was then dried with anhydrous sodium sulfate. The organic phase was then evaporated to dryness to obtain crude Pt(II) intermediate L1. The crude product did not require further purification.
[0031] S2. Replace 2-(2,4-difluorophenyl)pyridine with 2-(3,5-difluorophenyl)pyridine, and prepare crude Pt(II) intermediate L2 by the same method as in step S1.
[0032] S3. Pt(II) intermediate L1 (0.61 g, 1.00 mmol), Pt(II) intermediate L2 (0.61 g, 1.00 mmol), and (S) / (R)-4-isopropylthiazolidin-2-sulfur (0.32 g, 2.00 mmol) were dissolved in 60 mL of dichloromethane solution, followed by the addition of K2CO3 (0.26 g, 2.00 mmol). The reaction was carried out under nitrogen protection at 50 °C with stirring for 24 h. After the reaction was completed, the system was cooled to room temperature, and the solution was evaporated to dryness to obtain the crude product. The crude product was purified by silica gel column chromatography (eluent: petroleum ether / dichloromethane = 3:1) to obtain the ligand isomeric chiral ( R , Sp , R ) / ( S , Rp , S )-PtL1L2 (orange-red powder, yield 25%). Product ( R , Sp , R Characterization data for )-PtL1L2 include proton NMR spectra: 1HNMR (400 MHz, Chloroform-d) δ 8.66 (ddd, J = 5.8, 1.7, 0.7 Hz, 1H), 8.57 – 8.44 (m, 1H), 7.67 – 7.59 (m, 2H), 7.53 (dt, J = 7.4, 1.5 Hz, 1H), 7.22 (ddd, J = 7.3, 5.8, 1.4 Hz, 1H), 7.14 (ddd, J = 7.3, 5.8, 1.5 Hz, 1H), 7.06 – 6.97 (m, 1H), 6.61 (ddd, J = 9.6, 7.2, 2.5 Hz, 2H), 6.31 (ddd, J = 12.5, 8.9, 2.5 Hz, 1H), 5.97 (td, J = 9.4, 2.5 Hz, 1H), 4.70 (td, J = 10.2, 3.4 Hz, 1H), 4.62 (td, J = 10.1, 3.3 Hz, 1H), 3.70 (td, J = 7.0, 3.4 Hz, 1H), 3.47 (td, J = 7.0, 3.4 Hz, 1H), 3.28 (d, J = 10.2 Hz, 2H), 3.25 – 3.19 (m, 2H), 1.00 (d, J = 7.1 Hz, 3H), 0.93 (t, J = 7.0 Hz, 6H), 0.84 (d, J = 6.8 Hz, 3H). Carbon spectrum: 13 CNMR (600 MHz, Chloroform-d) δ: 182.6, 181.7, 165.6, 162.7, 161.0, 150.0, 149.2, 146.1, 146.0, 138.4, 138.3, 122.7, 121.9, 121.7, 119.1, 115.9, 115.7, 106.0 (d, J = 3.3 Hz), 105.8 (d, J = 2.8 Hz), 105.0 (d, J = 24.3 Hz), 104.6 (d, J = 23.7 Hz), 98.9 – 98.0 (m), 82.0, 81.8, 32.9, 32.8, 29.7, 29.7, 20.9, 20.8, 15.8, 15.6. Fluorine spectrum: 19FNMR (600 MHz, Chloroform-d) δ -89.26 (t, J = 8.4 Hz), -107.85 – -108.00 (m), -111.44 (t, J= 10.9 Hz), -119.42 – -119.54 (m). ESI-MS (m / z): calcd for ([M+H]+) 1090.0720, found 1090.0726.
[0033] Example 2: Complex ( R , Sp , R ) / ( S , Rp , S Preparation of )-PtL2L3 The reaction formula is as follows: S1. 2-(3,5-difluorophenyl)pyridine (0.38 g, 2.00 equivalent, 2.00 mmol) and K2PtCl4 (0.41 g, 1.00 equivalent, 1.00 mmol) were dissolved in 32 mL of a 2-ethoxyethanol / water (3:1, volume ratio) mixed solvent. The mixture was stirred at 85 °C for 12 hours under nitrogen protection. After the reaction was completed, the system was cooled to room temperature. The reaction solution was concentrated and washed with dichloromethane and water. The organic phase was then dried with anhydrous sodium sulfate. The organic phase was then evaporated to dryness to obtain crude Pt(II) intermediate L2. The crude product did not require further purification.
[0034] S2. Using the same method, replace 2-(3,5-difluorophenyl)pyridine with 1-(2,4-difluorophenyl)isoquinoline, and prepare crude Pt(II) intermediate L3 by the same method as in step S1.
[0035] S3. Pt(II) intermediate L2 (0.61 g, 1.00 mmol), Pt(II) intermediate L3 (0.71 g, 1.00 mmol), and (S) / (R)-4-isopropylthiazolidin-2-sulfur (0.32 g, 2.00 mmol) were dissolved in 60 mL of dichloromethane solution, followed by the addition of K2CO3 (0.26 g, 2.00 mmol). The reaction was carried out under nitrogen protection at 50 °C with stirring for 24 h. After the reaction was completed, the system was cooled to room temperature, and the solution was evaporated to dryness to obtain the crude product. The crude product was purified by silica gel column chromatography (eluent: petroleum ether / dichloromethane = 3:1) to obtain the ligand isochiral ( R , Sp , R ) / ( S , Rp ,S )-PtL2L3 (dark red powder, yield 22%). Product ( R , Sp , R Characterization data for )-PtL2L3 include proton NMR spectroscopy: 1 HNMR (400 MHz, Chloroform-d) δ 8.58 (ddd, J= 5.8, 1.6, 0.7 Hz, 1H), 8.53 (d, J = 6.4 Hz, 1H), 7.76 – 7.66 (m, 3H), 7.63(td, J = 7.8, 1.5 Hz, 1H), 7.53 (d, J = 6.4 Hz, 1H), 7.50 – 7.43 (m, 1H), 7.23 (ddd, J = 7.3, 5.8, 1.4 Hz, 1H), 7.10 – 7.05 (m, 1H), 6.75 (dd, J = 9.1, 2.5 Hz, 1H), 6.46 – 6.36 (m, 2H), 5.32 (td, J = 9.5, 2.4 Hz, 1H), 4.74 (ddd,J = 11.1, 9.1, 3.4 Hz, 1H), 4.63 (ddd, J = 11.5, 8.8, 3.4 Hz, 1H), 3.67 (td,J = 6.9, 3.4 Hz, 1H), 3.49 (td, J = 7.0, 3.4 Hz, 1H), 3.33 – 3.20 (m, 4H), 0.96 (t, J = 6.9 Hz, 6H), 0.93 (d, J = 6.7 Hz, 3H), 0.89 (d, J = 6.8 Hz, 3H). Carbon spectrum: 13CNMR (600MHz, Chloroform-d) δ 182.7, 181.2, 165.8, 164.3, 160.5, 158.0,149.7, 146.9, 142.0, 138.3, 137.3, 131.6, 129.7, 129.5, 126.7, 126.2, 124.6,120.6, 118.7, 115.9, 115.7, 106.1, 105.9, 104.3 (d, J = 23.6 Hz), 103.9 (d, J= 23.7 Hz), 98.9 – 98.0 (m), 82.0, 81.8, 32.9, 32.8, 29.8, 29.7, 20.8, 20.8, 15.8, 15.7. Fluorine spectrum: 19 FNMR (600 MHz, Chloroform-d) δ -90.18 (t, J = 8.5 Hz), -96.41 (q, J = 10.8 Hz), -107.63 (q, J = 9.3, 8.3 Hz), -117.18 (q, J = 8.7Hz). ESI-MS (m / z): calcd for ([M+H]+) 1140.0877, found 1140.0910.
[0036] Experimental Example (1) The ultraviolet absorption spectrum and photoluminescence spectrum of the complexes in Example 1 and Example 2 were determined; (2) The phosphorescence lifetime of the complexes in Example 1 and Example 2 was determined; (3) Determination of the high performance liquid chromatography of the complexes in Example 1 and Example 2; (4) Determine the powder phosphorescence quantum yield of the complexes in Example 1 and Example 2; (5) The circularly polarized emission spectra of the powders of the complexes in Example 1 and Example 2 were measured; (6) Determine the circular dichroism chromatogram of the complexes in Example 1 and Example 2.
[0037] Experimental Example 1: Testing the UV absorption spectra of Examples 1 and 2 The concentration measured using ultraviolet absorption spectroscopy in this invention is 3.0 × 10⁻⁶. -5 mmol / dm 3 The test solvent was toluene, and the test results were as follows: Figure 1 As shown, ( R , Sp , RThe maximum absorption wavelength of the )-PtL1L2 complex is 478 nm; R , Sp , R The maximum absorption wavelength of the )-PtL2L3 complex is 506 nm.
[0038] Experimental Example 2: Testing the photoluminescence spectra of Examples 1 and 2 The photoluminescence spectroscopy test samples used in this invention are solid powders of the complexes from Examples 1 and 2. The test results are as follows: Figure 2 As shown, ( R , Sp , R The emission wavelength of the )-PtL1L2 complex is 624 nm; R , Sp , R The emission wavelength of the )-PtL2L3 complex is 668 nm.
[0039] The photoluminescence spectroscopy test sample used in this invention is a toluene solution of the complexes in Examples 1 and 2. The test results are as follows: Figure 3 As shown, ( R , Sp , R The emission wavelength of the )-PtL1L2 complex is 624 nm; R , Sp , R The emission wavelength of the )-PtL2L3 complex is 666 nm.
[0040] The photoluminescence spectroscopy test samples used in this invention are 5 wt% PMMA-doped thin films of the complexes in Examples 1 and 2. The test results are as follows: Figure 4 As shown, where ( R , Sp , R The emission wavelength of the )-PtL1L2 complex is 610 nm; R , Sp , R The emission wavelength of the )-PtL2L3 complex is 656 nm.
[0041] Experimental Example 3: Testing the phosphorescence lifetime of the complexes in Examples 1 and 2 The phosphorescence lifetime test samples used in this invention are solid powders of the complexes from Examples 1 and 2. The test results are as follows: Figure 5 As shown, ( R , Sp , R The phosphorescence lifetime of the )-PtL1L2 complex is 2.08 μs; R , Sp ,R The phosphorescence lifetime of the )-PtL2L3 complex is 1.15 μs.
[0042] The phosphorescence lifetime test samples used in this invention are thin films doped with 5% PMMA from the complexes in Examples 1 and 2. The test results are as follows: Figure 6 As shown, ( R , Sp , R The phosphorescence lifetime of the )-PtL1L2 complex is 2.83 μs; R , Sp , R The phosphorescence lifetime of the )-PtL2L3 complex is 2.17 μs.
[0043] Experimental Example 4: High-performance liquid chromatography (HPLC) test of the complexes in Examples 1 and 2 This invention uses high-performance liquid chromatography (HPLC) to analyze the chirality of the complexes in Examples 1 and 2. Figure 7 visible,( R , Sp , R ) / ( S , Rp , S The bimodal retention times of the )-PtL1L2 complex were 4.2 min and 4.6 min, respectively; Figure 8 visible,( R , Sp , R ) / ( S , Rp , S The retention times of the bimodal PtL2L3 complex were 4.3 min and 4.7 min, respectively.
[0044] Experimental Example 5: Testing the powder phosphorescence quantum yield of the complexes in Examples 1 and 2 This invention employs the integrating sphere method to determine the quantum yield of the powders of the complexes in Examples 1 and 2, with an excitation wavelength of 450 nm. The test results are as follows: Figure 9 As shown, the powder phosphorescence quantum yields of the complexes in Examples 1 and 2 were 80.9% and 24.7%, respectively.
[0045] Experimental Example 6: Testing the powder circularly polarized emission spectra of the complexes in Examples 1 and 2 This invention uses a circular polarization spectrometer to measure the circular polarization luminescence of the complexes in Examples 1 and 2, with an excitation wavelength of 400 nm. The test results are as follows: Figure 10As shown, Examples 1 and 2 exhibit strong circularly polarized emission at 580 nm and 680 nm, respectively, with good ellipticity and asymmetry factors of 0.87 × 10⁻⁶. -3 / 1.02×10 -3 and 1.68×10 -3 / 2.23×10 -3 .
[0046] Experimental Example 7: Circular dichroism spectroscopy test of the complexes in Examples 1 and 2 This invention uses a circular dichroism chromatograph to determine the concentration of the complexes in Examples 1 and 2 using circular dichroism chromatography, with a test concentration of 3.0 × 10⁻⁶. -5 mmol / dm 3 The test solvent was toluene, and the test results were as follows: Figure 11 As shown, the complexes in Examples 1 and 2 all exhibit strong chiral signals in the range of 300-550 nm, and the curves have good ellipticity. The enantiomers in these examples also exhibit good spectral symmetry.
[0047] In summary, this invention discloses a simple method for synthesizing ligand-isomeric planar chiral Pt(II) complexes. It aims to construct a series of novel planar chiral complexes induced by coordination using the planar coordination configuration of simple binuclear Pt(II) complexes, and to enrich their luminescent properties by utilizing the inconsistency between the left and right ligand structures. The introduction of chiral bridging ligands successfully solves the problem of chiral resolution, enabling a fixed chiral correlation between the point chirality of the bridging ligand and the planar chirality of the coordination plane. These complexes possess relatively simple molecular structures and excellent chiral optical properties, making them ideal materials for preparing red CP-OLEDs and potentially applicable in novel energy-saving materials and chiral catalysis.
[0048] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.
Claims
1. A ligand isomeric chiral Pt(II) complex, characterized in that, It is one of the following structures or its derivatives: 。 2. The method for preparing the ligand isomeric chiral Pt(II) complex according to claim 1, characterized in that, Includes the following steps: Two different 2-phenylpyridine derivatives were reacted with K2PtCl4 to obtain Pt(II) complex intermediate A and Pt(II) complex intermediate B, respectively. Pt(II) complex intermediate A and Pt(II) complex intermediate B were reacted together with (S) / (R)-4-isopropylthiazoline-2-sulfur to obtain a single-chiral ligand isomeric chiral Pt(II) complex.
3. The preparation method according to claim 2, characterized in that, The 2-phenylpyridine derivative has one of the following structures: 。 4. The preparation method according to claim 3, characterized in that, The preparation method is specifically as follows: S1. Two different 2-phenylpyridine derivatives were dissolved in a mixed solvent with K2PtCl4 and stirred under nitrogen. After the reaction was completed, dichloromethane and water were added simultaneously for washing and extraction. The solution was allowed to stand and separate into layers. The organic phase was dehydrated and then dried to obtain Pt(II) complex intermediate A and Pt(II) complex intermediate B, respectively. S2. Pt(II) complex intermediate A, Pt(II) complex intermediate B, and (S) / (R)-4-isopropylthiazoline-2-thiosulfate were dissolved in dichloromethane solution and K2CO3 was added. The mixture was then stirred under nitrogen protection. After the reaction was completed, the mixture was dried and purified to obtain a single-chiral ligand isomeric chiral Pt(II) complex.
5. The preparation method according to claim 3, characterized in that, The molar ratio of 2-phenylpyridine derivative to K2PtCl4 in S1 is 2:
1.
6. The preparation method according to claim 3, characterized in that, The mixed solvent in S1 is a mixture of 2-ethoxyethanol and water in a volume ratio of 3:
1.
7. The preparation method according to claim 3, characterized in that, The stirring reaction in S1 is carried out at a temperature of 85°C for 12 hours.
8. The preparation method according to claim 3, characterized in that, The molar ratio of Pt(II) complex intermediate A, Pt(II) complex intermediate B, and (S) / (R)-4-isopropylthiazoline-2-sulfur in S2 is 1:1:
2.
9. The preparation method according to claim 3, characterized in that, The stirring reaction in S2 is carried out at a temperature of 50°C for 24 hours.
10. The application of the ligand isomeric chiral Pt(II) complex of claim 1 in achieving efficient red circularly polarized luminescence under solid powder conditions.