A 3-knot topology configuration compound and a preparation method and application thereof

Abstract

The application belongs to the field of supramolecular topology chemistry and coordination self-assembly technology, and particularly relates to a 3-knotted topological configuration compound and a preparation method and application thereof. The 3-knotted topological configuration compound is formed by self-assembly of a tridentate organic imidazole ligand and a Rh metal node through coordination driving, with the center of the ligand as a topological pivot, three independent strands radiating from the vertex, and through crossing, winding and interlocking in three-dimensional space, finally forming a continuous, non-dissociable closed loop. The application discards the winding strategy of traditional bidentate linear ligands, and realizes one-step efficient construction of a complex topological structure by increasing the number of ligand teeth and precisely controlling the rigidity and bond angle of the ligand. The 3-knotted topological configuration structure belongs to a rare twelve-nuclear supramolecular structure in a coordination-driven self-assembly system, provides a new paradigm for supramolecular topology, and has important application prospects in the fields of catalytic synthesis and photothermal conversion materials.

Description

Technical Field

[0001] This invention belongs to the field of supramolecular topological chemistry and coordination self-assembly technology, specifically relating to a 3-entangled topological configuration compound, its preparation method, and its application. Background Technology

[0002] Mechanically interlocked coordination supramoleculars have attracted widespread attention from the scientific community due to their unique topological configurations and potential applications. Designing specific linking ligands to assemble novel mechanically interlocked supramoleculars is a challenging research topic. Currently, common synthetic methods include metal ion template methods and coordination-driven self-assembly methods. The latter has shown significant advantages in the synthesis of such complex structures, and some discrete topological species with different entanglement properties have been successfully synthesized, including knots, ravels, catenanes, and rotaxanes. Among these topologies, significant progress has been made in the synthetic research of knots (single-curve cyclic entanglement), with a series of molecules exhibiting complex topological entanglement, such as 31-knot, 41-knot, 51-knot, 71-knot, and 8-knot structures. 18 Topological entanglements are being synthesized by scientists. Meanwhile, various topological compounds, including [2-6]-chains, are being synthesized, achieving significant advancements from low- to high-order topologies. However, among these topological species, the synthesis of molecular entanglements (three or four curves emanating from a vertex in a closed loop) has been relatively slow, with only a few entangled species reported. For example, using a semi-sandwich rhodium-based building block and a tetraphenylethylene tetradentate pyridine ligand, a coordination-driven self-assembly strategy was employed to construct a 4-entangled species with four intersecting entanglements, breaking the synthetic gap in 4-entanglements. However, 3-entanglements possess both complex topological entanglement and closed loop characteristics, resulting in high stability and high functional density; simultaneously, they exhibit both mathematical beauty and practical resilience. But designing and constructing 3-entangled species (topological species with three curves emanating from a vertex in a loop) presents significant challenges. Summary of the Invention

[0003] In view of this, the object of the present invention is to provide a 3-entangled topological configuration compound, its preparation method, and its application. The present invention provides a 3-entangled topological configuration compound, realizing the construction of 3-entangled species.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention provides a 3-entangled topological compound with the structural formula shown in Formula I. Formula I; The 3-entangled topological configuration compound is constructed from 4 L ligands and 6 E units, the structural formulas of the L ligands are shown in Formula II, and the structural formulas of the E units are shown in Formula III. Formula II, Formula III.

[0005] The “3-entanglement” refers to a single vertex as the topological hub, from which three independent intertwined strands radiate outwards and entwine and rotate in three-dimensional space, eventually locking together to form a continuous and indivisible closed loop (two strands connect to the third layer and one connects to the second layer, rather than all strands adopting an interlayer connection entanglement mode).

[0006] Preferably, the crystal of the 3-entangled topological configuration compound belongs to the orthorhombic crystal system with space group . P nna, cell parameters are a = 42.0275(17) Å, b = 39.0812(18) Å, c = 44.858(2) Å, α = 90°, β = 90°, γ = 90°, V = 73679(6) Å 3 .

[0007] This invention also provides a method for preparing the 3-entangled topological configuration compound described above, comprising the following steps: Silver trifluoromethanesulfonate, dichloro(pentamethylcyclopentadienyl)rhodium(III) dimer and organic solvent were mixed and subjected to metathesis reaction, followed by solid-liquid separation. The resulting liquid, 2,5-dihydroxy-1,4-benziquinone and sodium hydroxide were mixed and subjected to first coordination-driven self-assembly to obtain a system containing E units. The system containing the E unit and the ligand L were mixed and subjected to second coordination-driven self-assembly, followed by crystallization to obtain the 3-entangled topological compound. The structural formula of the L ligand is shown in Formula II, and the structural formula of the E unit is shown in Formula III. Formula II, Formula III.

[0008] Preferably, the molar ratio of the silver trifluoromethanesulfonate and the dichloro(pentamethylcyclopentadienyl)rhodium(III) dimer is (3.8~4.2):(0.8~1.2).

[0009] Preferably, the temperature of the metathesis reaction is 10~30 ℃; the metathesis reaction is carried out in the dark and under stirring conditions, and the stirring time is 4~6 hours.

[0010] Preferably, the molar ratio of the dichloro(pentamethylcyclopentadienyl)rhodium(III) dimer to 2,5-dihydroxy-1,4-benziquinone is 1:(0.8~1.2); and the molar ratio of the 2,5-dihydroxy-1,4-benziquinone to sodium hydroxide is 1:(1.8~2.2).

[0011] Preferably, the temperature of the first coordination-driven self-assembly is 10~30 ℃; the first coordination-driven self-assembly is carried out under stirring conditions, and the stirring time is 10~14 hours.

[0012] Preferably, the temperature of the second coordination-driven self-assembly is 10~30 ℃; the second coordination-driven self-assembly is carried out under stirring conditions, and the stirring time is 6~10 hours.

[0013] The present invention also provides the application of the 3-entangled topological compound described in the above technical solution or the 3-entangled topological compound obtained by the above preparation method as a photothermal conversion material.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a 3-entangled topological compound, with the structural formula shown in Formula I. Utilizing tripentate ligands, this invention successfully constructs a 3-entangled structure with nontrivial topological properties through a unique assembly mode of "single-vertex divergence and three-strand interweaving." This leap from "linear entanglement" to "radial multi-entanglement" greatly enriches the topological library of mechanically interlocked molecules (MIMs) and provides a novel paradigm for modeling higher-order twisted structures in supramolecular topology.

[0015] Pentamethylcyclopentadienyl (semi-sandwich) metal units have good solubility, crystallinity and directional coordination characteristics. Based on this building unit, this invention selects a suitable tridentate imidazole ligand and achieves efficient construction of 3-entangled topological species through a coordination-driven self-assembly strategy.

[0016] This invention also provides a method for preparing the 3-entangled topological configuration compound described above. This method utilizes the geometric characteristics of the ligands themselves and the directionality of metal coordination to drive coordination-driven self-assembly, eliminating the need for any additional template agents to drive the formation of the 3-entangled structure. This not only significantly reduces raw material costs and the complexity of the synthesis process but also simplifies the post-processing (only simple solvent diffusion is required to obtain a large number of bulk crystals with a purity of over 98%), greatly improving the atom economy and ease of operation of the synthesis.

[0017] This invention abandons the traditional entanglement strategy of bidentate linear ligands. By increasing the number of ligand teeth and precisely controlling the ligand rigidity and bond angle, it achieves one-step efficient construction of complex topological structures with high selectivity and high yield. This 3-entangled topological configuration is a rare dodecenary supramolecular structure in coordination-driven self-assembly systems, providing a new paradigm for supramolecular topology and showing important application prospects in catalytic synthesis and photothermal conversion materials. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A diagram showing the molecular structure of a compound with a 3-entangled topological configuration; Figure 2 Four different color diagrams are shown for compounds with 3-entangled topological configurations; Figure 3 A simplified topological representation of compounds with a 3-entangled topological configuration; Figure 4 A diagram illustrating intermolecular forces in the structure of a 3-entangled topological compound. Figure 5 A space-filled illustration of the structure of a compound with a 3-entangled topological configuration; Figure 6 ESI-TOF-MS spectra of compounds with 3-entangled topological configurations; Figure 7 Mass spectra of the +3 valence state of compounds with 3-entangled topological configurations; Figure 8 For 3-entangled topological configuration compounds 1 H NMR spectrum; Figure 9 For 3-entangled topological configuration compounds 1 H- 1 H COSY NMR spectrum; Figure 10 For 3-entangled topological configuration compounds 1 H DOSY NMR spectrum; Figure 11 Temperature-time curves of 3-entangled topological configuration compounds under different laser power intensities; Figure 12 Linear fitting plot of temperature difference versus laser power intensity for 3-entangled topological configuration compounds; Figure 13 Compounds with a 3-entangled topological configuration at 1.05 W / cm 2 Temperature change graph under irradiation. Detailed Implementation

[0020] This invention provides a 3-entangled topological compound with the structural formula shown in Formula I: Formula I.

[0021] In this invention, the 3-entangled topological configuration compound is constructed from 4 L ligands and 6 E units (L4E6). The L ligands are tridentate nitrogen-containing ligands 4,4',4''-tris(4-imidazolyl)triphenylamine, with the structural formula shown in Formula II; the E units are Rh-containing units, with the structural formula shown in Formula III. Formula II, Formula III.

[0022] The 3-entangled topological configuration compound of this invention is a discrete, multi-layered, cross-entangled assembly composed of four L ligands and six E units. Structural analysis reveals that the nitrogen atom center in the L ligand acts as a vertex, extending outwards in three curved segments. These segments intertwine to form a closed system, ultimately resulting in an entangled 3-entangled topological structure—an extremely rare topological structure in supramolecular chemistry. Furthermore, the tight spatial arrangement of the aromatic units indicates a large amount of π···π stacking and CH···π interactions throughout the framework. The synergistic effect of these interactions plays a crucial role in stabilizing the overall structure. Moreover, liquid-phase experimental analysis shows that the 3-entangled topological configuration compound maintains its solid-state topological integrity in solution.

[0023] The "3-entangled topology" refers to a topological hub with a single vertex from which three independent intertwined strands radiate outwards. These strands entwine and rotate in three-dimensional space, ultimately locking together to form a continuous, non-dissociable closed loop (two strands connect to the third layer, and one connects to the second layer, rather than all strands using an interlayer-separated entanglement pattern). This unique entanglement pattern overcomes the limitations of traditional bidentate ligand linear entanglement, achieving precise construction of higher-order topologies based on multidentate ligands. The 3-entangled topology compound possesses a dodecenum supramolecular structure, classifying it as a supramolecular compound with a centrally convergent 3-entangled topology.

[0024] In this invention, the crystal of the 3-entangled topological configuration compound belongs to the orthorhombic crystal system, with space group [space group number missing]. P nna, cell parameters are a = 42.0275(17) Å, b = 39.0812(18) Å,c = 44.858(2) Å, α = 90°, β = 90°, γ =90°, V = 73679(6) Å 3 .

[0025] This invention also provides a method for preparing the 3-entangled topological configuration compound described above, comprising the following steps: Silver trifluoromethanesulfonate, dichloro(pentamethylcyclopentadienyl)rhodium(III) dimer and organic solvent were mixed and subjected to metathesis reaction, followed by solid-liquid separation. The resulting liquid, 2,5-dihydroxy-1,4-benziquinone and sodium hydroxide were mixed and subjected to first coordination-driven self-assembly to obtain a system containing E units. The system containing the E unit and the ligand L were mixed and subjected to second coordination-driven self-assembly, followed by crystallization to obtain the 3-entangled topological compound. The structural formula of the L ligand is shown in Formula II, and the structural formula of the E unit is shown in Formula III. Formula II, Formula III.

[0026] Unless otherwise specified, all materials and equipment used in this invention are commercially available products in the field.

[0027] In this invention, silver trifluoromethanesulfonate, dichloro(pentamethylcyclopentadienyl)rhodium(III) dimer and organic solvent are mixed to carry out metathesis reaction, solid-liquid separation, and the resulting liquid, 2,5-dihydroxy-1,4-benziquinone and sodium hydroxide are mixed to carry out first coordination-driven self-assembly to obtain an E-unit-containing system.

[0028] In this invention, the silver trifluoromethanesulfonate (AgCF3SO3) and dichloro(pentamethylcyclopentadienyl)rhodium(III) dimer ([Cp) The preferred molar ratio of RhCl2]2) is (3.8~4.2):(0.8~1.2), specifically 4:1. The structural formula of the dichloro(pentamethylcyclopentadienyl)rhodium(III) dimer is shown in Formula IV: Formula IV.

[0029] In this invention, the organic solvent is preferably methanol, acetonitrile, or dichloromethane, more preferably methanol. The preferred ratio of silver trifluoromethanesulfonate to the organic solvent is 0.48 mmol: 5~15 mL, specifically 0.48 mmol: 10 mL. This invention uses methanol as the organic solvent, which has the advantages of good raw material solubility and excellent crystallinity of the subsequent target product.

[0030] In this invention, the metathesis reaction is preferably carried out in darkness and under stirring conditions, with the stirring time preferably being 4-6 hours, specifically 5 hours; the temperature of the metathesis reaction is preferably 10-30 °C, specifically room temperature (25 °C). During the metathesis reaction, Ag in AgCF3SO3 reacts with [Cp... Cl in RhCl2]2 forms AgCl precipitate, and at the same time generates an intermediate with the structure shown in formula V: Formula V.

[0031] In this invention, the solid-liquid separation is preferably carried out by filtration, and the filtration is preferably carried out at room temperature (25 °C).

[0032] In this invention, the molar ratio of the dichloro(pentamethylcyclopentadienyl)rhodium(III) dimer to 2,5-dihydroxy-1,4-benziquinone is preferably 1:(0.8~1.2), specifically 1:1. The molar ratio of the 2,5-dihydroxy-1,4-benziquinone to sodium hydroxide (NaOH) is preferably 1:(1.8~2.2), specifically 1:2.

[0033] In this invention, the first coordination-driven self-assembly is preferably carried out under stirring conditions, and the stirring time is preferably 10-14 hours, specifically 12 hours; the temperature of the first coordination-driven self-assembly is preferably 10-30 °C, specifically room temperature (25 °C). During the first coordination-driven self-assembly process, 2,5-dihydroxy-1,4-benzylquinone and sodium hydroxide form a sodium salt, which makes it easier to react with the intermediate in the liquid and generate E units in situ.

[0034] After obtaining the system containing E units, the present invention mixes the system containing E units with ligand L and performs second coordination-driven self-assembly, followed by crystallization to obtain the 3-entangled topological compound.

[0035] In this invention, the molar ratio of the E unit to the ligand L is preferably (2.8~3.2):(1.8~2.2), specifically 3:2 (i.e. 6:4).

[0036] In this invention, the second coordination-driven self-assembly is preferably carried out under stirring conditions, and the stirring time is preferably 6 to 10 hours, specifically 8 hours; the temperature of the second coordination-driven self-assembly is preferably 10 to 30 ℃, specifically room temperature (25 ℃).

[0037] In this invention, the crystallization is preferably carried out by solvent diffusion induction method. In the embodiment of this invention, the reaction solution obtained by the second coordination-driven self-assembly is transferred to a test tube, the surface is covered with a mixture of methanol and isopropyl ether in a volume ratio of 1:1 as an intermediate buffer layer, and then covered with an isopropyl ether layer. The product crystallization is induced by solvent diffusion method.

[0038] This invention provides a 3-entangled supramolecular structure with highly complex topological interlocking features. This structure is formed through self-assembly driven by precise coordination between metal units and organic ligands, belonging to the category of mechanically interlocked molecules (MIMs). The 3-entangled topological configuration compound of this invention is constructed from four L ligands and six E units, which assemble into a dodecenary supramolecular structure. Structural analysis shows that the nitrogen atom center in the L ligand acts as a vertex, extending outwards from which three curved segments intertwine to form a closed system, ultimately resulting in an entangled 3-entangled topological structure—an extremely rare topological structure in supramolecular chemistry. Furthermore, the tight spatial arrangement of aromatic units indicates a large number of π···π stackings and CH···π interactions throughout the framework. The synergistic effect of these interactions plays a key role in stabilizing the overall structure. Moreover, liquid-phase experimental analysis shows that the 3-entangled topological configuration compound maintains its solid-state topological integrity in solution. 3-Entangled compounds exhibit significant π-π stacking interactions, demonstrating the potential to promote photothermal conversion. Furthermore, the discrete porous stacking channels facilitate the accommodation of suitable guest molecules through supramolecular interactions such as steric effects and hydrophobic interactions. Complexes containing metal Rh possess catalytic activity and can serve as catalysts to accelerate the reaction process.

[0039] The present invention also provides the application of the 3-entangled topological compound described in the above technical solution or the 3-entangled topological compound obtained by the above preparation method as a photothermal conversion material.

[0040] To further illustrate the present invention, the 3-entangled topological configuration compounds, their preparation methods, and applications provided by the present invention are described in detail below with reference to the accompanying drawings and embodiments, but these should not be construed as limiting the scope of protection of the present invention.

[0041] Example 1 3-A method for preparing entangled topologically configured compounds, comprising the following steps: First, synthesize building block E: AgCF3SO3 (123.2 mg, 0.48 mmol) and [Cp RhCl₂]₂ (74.4 mg, 0.12 mmol) was dissolved in methanol (10 mL) and stirred in the dark for 5 hours. The resulting mixture was filtered at room temperature. 2,5-Dihydroxy-1,4-phenylquinone (16.81 mg, 0.12 mmol) and sodium hydroxide (9.6 mg, 0.24 mmol) were added to the filtrate, and the solution was stirred at room temperature for 12 hours to give a yellow solution from which E was generated in situ.

[0042] Ligand L (35.45 mg, 0.08 mmol) was then introduced into the yellow solution, and the reaction mixture was stirred at room temperature for 8 hours to obtain a brownish-yellow solution. Single crystals of the target product were obtained by diffusing isopropyl ether into a methanol solution (the resulting reaction liquid was first concentrated to 2–3 mL, then the methanol solution containing the target product was injected into the bottom of a test tube, followed by a careful covering with a 1:1 volume ratio of methanol and isopropyl ether as an intermediate buffer layer, and finally isopropyl ether was added on top; crystallization was induced by solvent diffusion). The single crystals were analyzed by X-ray diffraction. The mass of the single crystal was 110.11 mg (target product molecular weight 7244.41), with a yield of 76%.

[0043] (1) Determination of the crystal structure of 3-entangled topological configuration compounds Selected, smooth, and transparent single crystals with a size of approximately 0.1–0.5 mm were vacuum-attached to a capillary glass rod and placed on an X-ray single-crystal diffractometer at room temperature. The diffractometer was then used to analyze the crystals using Cu-424 filtered through a graphite monochromator. K Using alpha rays (α = 0.83 Å) as the incident source, diffraction intensity data were collected within a certain angular range using the '\w scans' method. Olex 2 was used, and the structure was analyzed using Intrinsic Phasing from the ShelXT package. The structure was then refined using the least squares method from the ShelXL package. Detailed crystal measurement data are shown in Table 1. The crystal structure is shown in... Figures 1-5 .

[0044] Table 1.3 - Main crystallographic data of entangled topological configuration compounds

[0045] (2) Mass spectrometric characterization of 3-entangled topological configuration The existence of the 3-entangled topological configuration compound was further confirmed by electrospray ionization time-of-flight mass spectrometry measurements, with a characteristic peak at m / z = 2265.8606. This peak is in high agreement with the theoretical isotopic distribution of the +3 valence ion, with the theoretical peak located at m / z = 2265.8528 (see [link to relevant data]). Figure 6 and Figure 7 ).

[0046] (3) NMR characterization of 3-entangled topological configuration compounds Nuclear magnetic resonance (NMR) spectroscopy confirmed the consistency of its liquid-phase structure with its solid-phase structure. A complex set of proton resonance signals was observed in CD3OD solution. Notably, Cp... The signal split into a six-fold pattern, an unusual phenomenon that significantly increases the difficulty of proton assignment. Specifically, the compound 3-entangled... 1 The H NMR spectrum revealed multiple signals with complex coupling modes, aided by the recorded... 1 H– 1 From the 1H COSY NMR spectrum, these signals can be clearly assigned. Six singlets with δ at 1.85, 1.82, 1.78, 1.73, 1.70, and 1.66 ppm, and signals with δ at 6.05, 5.94, 5.79, 5.66, and 5.08 ppm observed in the aromatic region, were assigned to Cp in 3-tangles, respectively. The proton resonance signals of the unit and benzoquinone moiety were observed. Furthermore, six singlets in the aromatic region at δ of 7.95, 7.60, 7.59, 7.53, 7.31, and 6.77 ppm were identified as imidazole proton signals. Additionally, six other groups of pyridine and imidazole proton signals were also clearly assigned. Crucially, all observable proton signals were observed in... 1 The H DOSY spectra all showed a single and consistent diffusion coefficient, confirming that the 3-entangled topological configuration compound exists as an assembled entity in solution. Figures 8-10 ).

[0047] Application Example 1 The 3-entangled compound (10 mg) based on the semi-sandwich rhodium building blocks obtained in Example 1 was placed in a high-temperature resistant sample cell and irradiated with a 730 nm laser. Simultaneously, the temperature change of the sample was monitored in real time using a near-infrared thermal imager.

[0048] First, at different laser power densities (0.15, 0.45, 0.75, and 1.05 W / cm², respectively)... 2 Under these conditions, the evolution of the compound's temperature rise behavior over time was systematically investigated. After processing and analyzing the collected data, the corresponding temperature-time curves were plotted. Figure 11 The results show that at 1.05 W / cm 2 Under laser irradiation, the 3-entangled compound exhibited the largest temperature rise (ΔT = 25.9 ℃).

[0049] Further analysis of the temperature difference-time response curves under different laser intensities ( Figure 12It can be seen that within the tested power range, the temperature difference of the sample is significantly positively correlated with the laser intensity: that is, as the laser power density increases, the temperature rise trend also increases accordingly.

[0050] like Figure 13 As shown, the sample temperature increased significantly from the initial 23.3 ℃ to 49.2 ℃ over time, clearly revealing that the 3-entangled compound based on the semi-sandwich rhodium building unit has excellent photothermal conversion performance. This photothermal effect can be attributed to the following two key factors: (1) the semi-sandwich rhodium building unit itself exhibits strong fluorescence quenching characteristics, effectively suppressing the deactivation of the excited state through radiation; (2) in the solid state, the close packing between molecules further restricts the radiative transition process, thereby significantly promoting the non-radiative relaxation channel and efficiently converting the absorbed light energy into heat energy.

[0051] This invention provides a novel supramolecular topology that achieves a specific spatial configuration through multiple stacking modes and a unique entanglement method, laying the structural foundation for its application in photothermal conversion and catalytic synthesis.

[0052] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, not all embodiments. People can obtain other embodiments based on the present invention without creative effort, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A 3-entangled topological configuration compound, characterized in that, The structural formula is shown in Formula I: Formula I.

2. The 3-entangled topological configuration compound according to claim 1, characterized in that, It is constructed from 4 L-ligands and 6 E-units, the structural formulas of the L-ligands are shown in Formula II, and the structural formulas of the E-units are shown in Formula III: Formula II, Formula III.

3. The 3-entangled topological configuration compound according to claim 1 or 2, characterized in that, The crystal of the 3-entangled topological configuration compound belongs to the orthorhombic crystal system, with space group [space group number missing]. P nna, cell parameters are a = 42.0275(17) Å, b =39.0812(18) Å, c = 44.858(2) Å, α = 90°, β = 90°, γ = 90°, V = 73679(6) Å 3 .

4. The method for preparing the 3-entangled topological configuration compound according to any one of claims 1 to 3, characterized in that, Includes the following steps: Silver trifluoromethanesulfonate, dichloro(pentamethylcyclopentadienyl)rhodium(III) dimer and organic solvent were mixed and subjected to metathesis reaction, followed by solid-liquid separation. The resulting liquid, 2,5-dihydroxy-1,4-benziquinone and sodium hydroxide were mixed and subjected to first coordination-driven self-assembly to obtain a system containing E units. The system containing the E unit and the ligand L were mixed and subjected to second coordination-driven self-assembly, followed by crystallization to obtain the 3-entangled topological compound. The structural formula of the L ligand is shown in Formula II, and the structural formula of the E unit is shown in Formula III. Formula II, Formula III.

5. The preparation method according to claim 4, characterized in that, The molar ratio of the silver trifluoromethanesulfonate and the dichloro(pentamethylcyclopentadienyl)rhodium(III) dimer is (3.8~4.2):(0.8~1.2).

6. The preparation method according to claim 4 or 5, characterized in that, The temperature of the metathesis reaction is 10~30℃; the metathesis reaction is carried out in the dark and under stirring conditions, and the stirring time is 4~6 hours.

7. The preparation method according to claim 4, characterized in that, The molar ratio of the dichloro(pentamethylcyclopentadienyl)rhodium(III) dimer to 2,5-dihydroxy-1,4-benziquinone is 1:(0.8~1.2); the molar ratio of the 2,5-dihydroxy-1,4-benziquinone to sodium hydroxide is 1:(1.8~2.2).

8. The preparation method according to claim 4 or 7, characterized in that, The temperature of the first coordination-driven self-assembly is 10~30 ℃; the first coordination-driven self-assembly is carried out under stirring conditions, and the stirring time is 10~14 hours.

9. The preparation method according to claim 4, characterized in that, The temperature of the second coordination-driven self-assembly is 10~30 ℃; the second coordination-driven self-assembly is carried out under stirring conditions, and the stirring time is 6~10 hours.

10. The application of the 3-entangled topological compound according to any one of claims 1 to 3 or the 3-entangled topological compound obtained by the preparation method according to any one of claims 4 to 9 as a photothermal conversion material.

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