181 results about "Conjugated system" patented technology

The invention relates to the technical field of nuclear waste treatment, in particular to a cucurbituril-based supramolecular organic framework material as well as a preparation method and application thereof. A construction unit of the supramolecular organic framework material is constructed by taking cucurbit [8] uril (CB8) as a subject and terephthalyl viologen ligand 1, 1 ''-(1, 4-phenylene) bis ([4, 4 '-bipyridyl]-1-onium) salt (PBV. 2X) as an object through the bonding effect of the subject and the object; in the molecular structure of the supramolecular organic framework material, the construction units are staggered and stacked in parallel in the space, and NO3 <-> is located at the gap of the adjacent CB8. The supramolecular organic framework material disclosed by the invention has high structural stability and cationic framework characteristics, and a rigid framework and a pyridine conjugated system of CB8 endow the material with excellent chemical / irradiation stability, so that the material shows ultrahigh removal rate on ReO4 <-> / TcO4 <-> in extreme environments (strong acid, strong alkali and high irradiation).

The application relates to a method for enhancing electrochemiluminescence signals by ion-pi interaction, belonging to the fields of electrochemiluminescence and analytical chemistry. 2+ By modifying the working electrode with a conjugated pi system, cation-pi interaction is introduced into the Ru(bpy)3 / triethylamine (TEA) system, efficient enrichment of TEA protonated cations near the electrode is realized, thereby greatly enhancing the electrochemical reaction rate and ECL signal. Further, anion-pi interaction is utilized to realize ECL signal enhancement of the luminol ECL system. In addition, the conjugated pi system is exposed to the outermost boundary of the electrode, so as to provide effective ion-pi interaction for ECL; when the pi system is covered by an alkyl chain, the modified electrode can only exhibit hydrophobic interaction. The method disclosed by the application provides a new strategy for extending ion-pi interaction to all types of ECL systems and constructing a high-sensitivity ECL analysis platform.

The invention describes a method for manufacturing a sodium-ion battery cell (1), comprising the steps of: providing an anode (A) and a cathode (K), inserting the anode (A) and the cathode (K) into a fluid-tight shell (2), and adding an additional electrolyte (EL-Z) to the shell (2), which contains as an additive a sodium salt (6) having an anion comprising a conjugated system of at least two aromatic compounds. The invention further describes a corresponding electrolyte (EL-Z) for a sodium-ion battery cell (1).

The application discloses a preparation method of transparent conductive adhesive film, and particularly relates to the technical field of conductive adhesive film preparation, which comprises the following specific steps: S1, preparing conductive liquid, which can be prepared by adding 30-50 parts of metal oxide powder and 20-30 parts of polyanion in a π conjugated system conductive polymer into a blender; S2, mixing materials; S3, cleaning a mold; S4, injection molding; S5, secondary conductive film coating; S6, vacuum molding; S7, film cutting molding. The application can fully extrude and mix various conductive materials by injecting the mixed materials into a molding mold, pulling the upper mold of the molding mold upward, adding the other half of the conductive liquid into a centrifugal machine, and placing the secondary transparent conductive film into a vacuum molding machine for film pressing, so that the gaps between the conductive materials are reduced and the compactness is improved, and thus the conductivity is better.

The invention relates to a double-response visual fluorescent probe as well as a construction method and application thereof. According to the present invention, carboxyl activation is performed on rhodamine B, Eu < 3 + > fixes the carboxyl of TAT through bridging and chelation, the Rh B can be combined with EuTAT through the amide reaction due to the steric hindrance effect of the asymmetric amino group to obtain the spirolactam ring so as to obtain the switch fluorescent probe controlled by the spirolactam ring, and the synthesized EuTAT-Rh B compound has characteristics of pH responsiveness and low fluorescence background, according to pH-dependent morphological structure conversion and fluorescence signal conversion caused by conjugate system change induced by vanadate coordination, visual vanadate solution monitoring and synchronous morphological discrimination can be realized in ultraviolet and fluorescence dual channels, and a convenient, simplified and highly sensitive visual platform is provided for visual analysis of vanadate.

The invention provides a plating bath for preparing a titanium-based lead dioxide electrode through electro-deposition and a preparation method of the plating bath, and relates to the field of plating baths, and the plating bath comprises lead p-toluenesulfonate, p-toluenesulfonic acid, fluoride of alkali metal and a dopant. The titanium-based lead dioxide electrode plating bath selects lead p-toluenesulfonate as a main salt and p-toluenesulfonic acid as an acid source, on one hand, the p-toluenesulfonic acid has a weak complexing effect and can form a complex with lead ions in the plating bath, the polarization effect of electro-deposition is increased, the compactness of a lead dioxide electro-deposition layer is improved, and the electrode stability is improved; on the other hand, p-toluenesulfonic acid serving as a hydrophilic organic molecule containing a large-pi conjugated system can be adsorbed on the surface of a lead dioxide crystal, growth of the lead dioxide crystal is regulated and controlled, electrodeposition distortion and internal stress of a lead dioxide active layer are reduced, and the accelerated life of an electrode is prolonged; and meanwhile, the p-toluenesulfonic acid can promote the dominant growth of beta-PbO2 with high catalytic activity, and is beneficial to improving the electrocatalytic activity of the titanium-based lead dioxide electrode.

The invention relates to the technical field of organic photoelectric materials and photovoltaic devices, in particular to a fluorine-substituted benzimidazolyl aniline compound and a synthesis method and application thereof. The structural general formula of the compounds is as shown in a formula I in the specification. The compound is introduced into a perovskite precursor solution as an additive and is used for preparing a perovskite thin film and a trans-perovskite solar cell. According to the compound provided by the invention, synergistic passivation of multi-site defects such as uncoordinated Pb < 2 + > and iodine vacancies is realized through aniline amino and benzimidazole ring N atoms in molecules, and non-radiative recombination is remarkably reduced; the strong electronegativity of fluorine atoms can enhance the electrostatic interaction between molecules and a perovskite Pb-I skeleton, meanwhile, a large conjugated system promotes pi-pi accumulation, and experimental results show that the photoelectric conversion efficiency of a champion device based on the additive can reach 23.3%; .

The invention relates to a preparation method of a high-performance ink material for a writing pen, and belongs to the technical field of ink materials. The high-performance ink material for the writing pen is obtained by self-making the modifier and blending the modifier with the pigment and other auxiliaries, and the modifier connects the benzotriazole with the hydroxypyridine, so that a conjugated system is expanded, the ultraviolet absorption strength of the modifier is higher, the efficiency is higher, and the ink material is more suitable for the writing pen. Ether introduced by pyridine can be used as a hydrogen bond acceptor to form a hydrogen bond with resin in an ink system, so that the ultraviolet light absorber is prevented from being separated out; quaternary ammonium salt cations in the modifier can improve the adhesive force and color fastness of the ink and the friction resistance and water resistance after writing; meanwhile, tert-butyl in the modifier reduces surface tension through steric hindrance, promotes leveling of ink and ink mark uniformity and enhances dispersion stability among resin, auxiliaries and pigment, so that the ink is not prone to layering and deterioration after being placed for a long time.

The application discloses a spiropyran derivative with color and fluorescence dual switch, a photochromic material and a preparation method and application thereof, the spiropyran derivative is a compound with a chemical structure general formula (1); and further discloses a photochromic material prepared by mixing the spiropyran derivative with an epoxy resin and a preparation method thereof. The aromatic fluorescent group is introduced into the side group of the spiropyran material, the conjugated system of the fluorescent group itself is large, and thus the fluorescence emission intensity after the spiropyran is opened is increased. The compound shows good photochromic and photoluminescent effects in organic solvents and solid media; the fluorescent group and the spiropyran material are combined, and a molecular switch material with significant color and fluorescence changes can be prepared; the spiropyran derivative can be used for preparing a two-dimensional optical display device and an intelligent material molecular switch.

The application discloses a kind of tetraphenyl ethylene-chalcone derivative preparation and its application preparation and its application.The structure is as follows: the method includes: 4-(1,2,2-triphenyl ethenyl) acetophenone, aldehyde derivative, sodium hydroxide (provides alkaline condition, pH=8.3~8.5), is placed in anhydrous ethanol, under the condition that heating temperature is 80 DEG C, reflux reaction 12h, after reaction is ended, the functional organic material is separated and purified.The functional organic material synthesized according to the above method has larger conjugated system, and has significant pressure-induced color change characteristics.The functional organic material disclosed in the application has low preparation cost, simple operation, simple method, and the material shows significant pressure-induced color change characteristics, can be applied to pressure-induced color change, luminescent material, printing and dyeing, color printing and anti-counterfeiting technical field.

The invention belongs to the technical field of perovskite solar cells, and particularly discloses a self-assembled monomolecular layer material with binaphthalene as a framework and a preparation method and application of the self-assembled monomolecular layer material. Phosphoric acid serves as an anchoring group, binaphthalene with a large pi conjugated system serves as the molecular framework, and the self-assembled monomolecular layer material is prepared. Intermolecular interaction can be effectively promoted, and molecular arrangement of molecules on an ITO conductive substrate can be regulated and controlled. By adjusting the side chain group of binaphthalene, the energy level of the material can be optimized, the work function of ITO can be improved, and efficient extraction and transmission of interface holes can be promoted. According to the synthesis method, the final product is obtained by oxidizing hydroxyl through phosphorus oxychloride, and the synthesis method has the advantages of being simple, high in yield, low in cost and the like. When the material is applied to a perovskite solar cell, the photoelectric conversion efficiency exceeding 25% can be obtained, and industrial application of the material is facilitated.

The invention relates to 200 light, thin and wear-resistant underpants fabric, and belongs to the technical field of fabric. A self-made antibacterial chain extender participates in preparation to obtain modified spandex filaments, and then the modified spandex filaments and cotton fibers are made into the underpants fabric; the quaternary ammonium salt of the antibacterial chain extender can be combined with bacterial cell membranes and interfere cell metabolism, so that efficient bacteriostasis is realized; the flexible long-chain alkyl group has a plasticizing effect, the elasticity loss of the fabric after liquid ammonia finishing is relieved, an amido bond and a cotton fiber hydroxyl group form a hydrogen bond, the interface bonding is enhanced, the layering of a spandex filament and a cotton fiber is avoided, a polycyclic aromatic fused ring and the amido bond form a conjugated system, an intermolecular strong hydrogen bond is matched, the high-temperature stability of the spandex is improved, and the methoxy group can consume chlorine; a conjugated system stabilizes nitrogen-hydrogen bonds, condensed ring steric hindrance hinders chlorine attack, chlorine resistance of the fabric is enhanced, underpants are not prone to loosening and deformation after being worn for a long time, and elasticity and wrapping feeling are kept for a long time.

The invention discloses a silver-pi conductive polymer gel material, a preparation method thereof and application of the silver-pi conductive polymer gel material in hydrazine vapor sensing. The material is constructed by precise self-assembly of A, A '-bispyridine hydrazone functionalized column [5] arene macrocycles and silver (I) ions through coordination driving. Through Ag-N coordination, Ag.... pi interaction and multiple C-H.... pi / pi.... pi accumulation, a gel network with an extended conjugated system and conductivity is constructed. Based on a'multi-site cooperation-enhanced capture and recognition 'strategy, the gel material can realize high-selectivity and high-sensitivity detection on hydrazine steam through three signal channels of electrochemistry, colorimetry and fluorescence, and the electrochemical detection limit is as low as 5 ppb. The method has a wide application prospect in the field of toxic pollutant gas sensing and monitoring.

The invention provides a light-emitting auxiliary material and a preparation method and application thereof, and belongs to the technical field of light-emitting materials, the structural formula of the light-emitting auxiliary material is shown in the general formula I. The light-emitting auxiliary material takes 9, 9-phenylalkyl fluorene as a parent nucleus, aryl and arylamine groups are connected to the two sides of fluorene of the 9, 9-phenylalkyl fluorene respectively, 9-phenylalkyl fluorene has relatively high glass transition temperature and quantum fluorescence efficiency, the stability and luminous efficiency of the compound can be effectively improved, the energy levels of the highest occupied molecular orbital and the lowest unoccupied molecular orbital can be flexibly adjusted by introducing an electron-donating group arylamine, and the energy barrier of hole injection can be effectively reduced; meanwhile, the other side is connected with an aryl group, so that a conjugated system can be effectively extended, a fluorescence quenching phenomenon caused by intermolecular pi-pi accumulation and excessive molecular aggregation is reduced, the service life of an OLED (Organic Light Emitting Diode) device can be effectively prolonged, the luminous efficiency of the OLED device can be effectively improved, and the driving voltage can be reduced by utilizing the light-emitting auxiliary material.

The application discloses a kind of sulfur indium zinc azine-based covalent organic framework composite materials and its preparation and application in photocatalytic reduction carbon dioxide.The application combines in-situ growth strategy with inorganic semiconductor ZnIn2S4 and COFs with large π conjugated system and excellent chemical stability to form a composite catalytic material.The composite catalytic material can realize the full reaction of carbon dioxide photocatalytic reduction without sacrificial agent and cocatalyst, and thus has great application potential in the field of photocatalysis.

The invention provides a development method of a large conjugated system spiropyrane photochromic material, which successfully introduces naphthalene and benzofuran units into a spiropyrane molecular skeleton through screening and optimization of multi-step organic chemical reaction conditions, and develops a series of large conjugated system spiropyrane photochromic micromolecular materials. Under the irradiation of 365 nm ultraviolet light or natural light, the absorption spectrum of the series of molecular materials can generate obvious red shift, and meanwhile, the free volume of molecules is obviously increased, so that the material can generate obvious photochromic phenomenon in a pure solid state, several large conjugated system spiropyrane materials all turn into blue systems after the irradiation of a light source, and the photochromic effect is good. By means of the development method of the large conjugated system spiropyrane photochromic material, various photochromic materials with the absorption spectrum obviously changed and the molecule free volume obviously increased after ring opening isomerization can be obtained, the photochromic capacity and reversibility of the materials are greatly improved, and regulation and control of the color of the photochromic materials are achieved.

The invention belongs to the technical field of organic electroluminescent functional materials and devices, and particularly relates to a triazine derivative containing pyridine and carbazole substituent groups and application of the triazine derivative. According to the invention, pyridine and carbazole are introduced to a substituent group of triazine, so that a conjugated system of the material is enhanced, and the electron transport performance and thermal stability of the compound are improved. The organic electroluminescent device prepared from the organic electronic material has the advantages of lower driving voltage, higher external quantum efficiency and longer service life.

The invention discloses a catalyst for wastewater COD (Chemical Oxygen Demand) in-situ degradation and a preparation method of the catalyst, and belongs to the field of catalysts. A four-stage synergistic catalysis system of a metal phthalocyanine active matrix, a thiophene conjugated bridging chain, a cyclodextrin functional modification layer and a cross-linked network skeleton is adopted; the catalyst has the characteristics of controllable reaction path, designable product structure and efficient catalytic performance, a metal phthalocyanine compound matrix is used as a core active unit, a catalytic active center is formed through metal-nitrogen coordination, and a thienyl bridged ring structure is used as an electron transfer carrier, so that the catalytic activity of the catalyst is improved. A continuous electron channel for connecting a phthalocyanine active center and a cross-linked network is constructed through a conjugated system, electron migration is accelerated, a cyclodextrin functional modification layer serves as a performance optimization unit, and an adaptive bridge of the catalyst and a wastewater system is constructed through subject-object inclusion and hydrophilic modification, so that the performance of the catalyst is improved. Finally, a synergistic catalysis system with active center capable of efficiently generating active oxygen, conjugate bridging capable of guaranteeing electron transfer and cyclodextrin capable of optimizing application performance is formed.

The application provides a method for monitoring lipid oxidation tendency, and belongs to the technical field of fluorescent probe detection. The method utilizes the fluorescence characteristics of a BODIPY molecular probe, and through selecting a molecular probe with a specific structure, directional reaction occurs between the BODIPY molecular probe and oxygen free radicals generated by lipid oxidation at a specific pH value. The conjugated system of the BODIPY molecular probe is destroyed, the half-chlorin structure is broken, and the fluorescence color changes from red to blue-green. According to the change of the fluorescence color before and after the reaction, the visualization monitoring of the lipid oxidation tendency and spatial distribution is realized through fluorescence imaging.

According to the polyimide containing the dihydroethane anthracene structure and the preparation method thereof, diol containing the dihydroethane anthracene structure is used as a raw material, a diamine monomer containing the dihydroethane anthracene structure is prepared through nucleophilic substitution and reduction reaction, and the diamine monomer containing the dihydroethane anthracene structure is used as the raw material to efficiently synthesize a target polymer through steps of polycondensation and the like. The polymer is characterized in that a large side group taking dicyclooctane as a core is introduced, and spatial repulsive force between benzene rings in molecules promotes the structure to be distorted to form a non-coplanar configuration. The unique three-dimensional structure can effectively destroy a molecular chain conjugated system, reduce the bulk density and interaction force of chain segments, and significantly improve the solubility of the polymer in an organic solvent. Meanwhile, the free volume of molecules is increased, regular arrangement of molecular chains is hindered, and the dielectric constant of the material is reduced. The diamine monomer based on the structure can be used for designing and synthesizing a plurality of polyimide materials with adjustable performance, and polyimide with excellent heat resistance, solubility, optical performance, thermal oxidation resistance and mechanical performance is obtained.

The application belongs to the technical field of materials, and provides a bio-based bismaleimide resin and a preparation method and application thereof, the resin being prepared by copolymerization of curcumin allyl ether and N,N'-4,4'-diphenylmethane bismaleimide. The curcumin allyl ether has a beta-diketone conjugated system, and is prepared by nucleophilic substitution reaction of curcumin and allyl bromide in a potassium carbonate acetone system; when prepared, the two are cured in stages at 150-240 DEG C to form a high crosslinking network, and a vacuum degassing and curing process is combined. The bio-based bismaleimide resin provided in the application has a curing peak temperature that is 20-30 DEG C lower than that of a traditional BD resin, a Tg that is nearly 90 DEG C higher than that of the BD resin, a carbon residue rate at 800 DEG C that is greater than or equal to 42%, an LOI that is greater than or equal to 37%, reaches a UL-94 V-0 level, a THR that is as low as 12.4 kJ / g, less flammable volatile matter at high temperatures, and a high degree of carbonization of residual carbon.

The application provides a pyridinone compound and a preparation method and application thereof, and belongs to the technical field of compound synthesis.The pyridinone compound is (E)-5-[(hydroxyl methylene)amino]-1,2,3,6-tetrahydropyridine-2,3,6-trione, and the molecular formula is C6H4N2O4.The pyridinone compound of the application simultaneously contains a hydroxyl group, an imino group and multiple carbonyl functional groups in the structure, forms a unique conjugated system and hydrogen bond network, and has the potential to be used as a bioactive precursor or a functional material.The pyridinone compound with a purity greater than 95% and a yield greater than 94% can be obtained by using the preparation method of the application, the compound shows good performance in dyeing applications, not only expands the application range of the pyridinone compound, but also provides a new way for realizing high-value utilization of fermentation broth resources, and has the advantages of environmental protection and economic benefits.

The invention discloses a bowl-shaped phosphine ligand as well as a preparation method and application thereof, and relates to the technical field of organic compounds and synthesis, non-planar phosphorus atoms are introduced into a planar conjugated system, a phosphine ligand with a concave structure is innovatively constructed, and spiral chirality is given to the phosphine ligand, so that a novel chiral phosphine ligand is obtained. Bromine atoms introduced in the design provide key sites for subsequent functionalization, coupling with various functional group reagents can be carried out through a classical Suzuki reaction, the modification potential of the ligand is remarkably enhanced, rapid construction of a diversified phosphine ligand library is facilitated, and the phosphine ligand library is used for various catalytic reactions. In addition, rich benzene ring units in the structure of the ligand endow the ligand with strong stacking capacity, so that the ligand shows good application prospects in the application fields of supramolecular self-assembly materials, molecular cages, catalyst loading and the like.

This invention discloses a small-molecule pyroptosis inducer for tumor cells. It utilizes an N,N-diethylimine group as an electron acceptor (A), a rhodamine scaffold as a π-conjugated system, thiophene and triphenylamine groups as the first electron donor (D1) and second electron donor (D2), respectively, and a rotatable vinyl and C-C single bond to increase intramolecular motion, forming a novel A-π-D1-D2 type small-molecule pyroptosis inducer, Rd-TTPA, with enhanced D-A structure and intramolecular motion. This small-molecule pyroptosis inducer can efficiently target tumor cell mitochondria, inducing pyroptosis through ultrasound-mediated reactive oxygen species production. It can serve as an enhanced sonodynamic deep tumor therapeutic agent guided by near-infrared II (NIR-II) fluorescence imaging.

The invention discloses an organic monocyclic macromolecular compound electrode material, a preparation method and application of the organic monocyclic macromolecular compound electrode material in a lithium ion battery. The organic monocyclic macromolecular compound electrode material is a monocyclic polybenzoquinone derivative which is obtained by carrying out dehydration condensation reaction on tetraaminobenzoquinone and disodium rose acid. The organic monocyclic macromolecular compound has a relatively large conjugated system and a relatively large aperture structure, is beneficial to full exposure of active sites and rapid transmission of ions, and remarkably inhibits the dissolution behavior of a material in an organic electrolyte, so that the cycling stability and the rate capability of a battery are remarkably improved. The molecular structure of the material contains a plurality of redox active sites (C = O and C = N), and can be reversibly coordinated with lithium ions to realize efficient lithium storage. The organic monocyclic molecular compound electrode material has high capacity, high stability and excellent rate capability, shows excellent electrochemical performance in a lithium ion battery system, and has high energy density and long service life.

The invention discloses a synthesis method of high-quality phenylacetyl chloride, and belongs to the technical field of synthesis of phenylacetyl chloride. According to the method, the crude phenylacetyl chloride is purified by combining the strong-polarity aprotic solvent dimethyl sulfoxide and the disubstituted ionic liquid, the solvent is strong in polarity, can remove high-polarity colored group impurities, does not contain reactive hydrogen and does not react with phenylacetyl chloride, and the phenylacetyl chloride and the solvent are separated by standing and layering after mixing at normal temperature. A double bond and a benzene ring in the disubstituted ionic liquid can form a pi-pi accumulation effect with macromolecular impurities containing conjugated systems such as oligomers in the impurities, ester groups can form stable hydrogen bonds with strong hydrogen bond donors such as aldehyde groups in the impurities, ether bonds can adsorb thioether impurities, and the adsorption capacity is further enhanced through SbF6 anions. The purity of the phenylacetyl chloride synthesized through the method reaches 99.0% or above through liquid phase analysis, and the phenylacetyl chloride does not change color through high-temperature tests and completely meets the standard of high-quality phenylacetyl chloride.

The invention provides a strong-conjugation high-polarity ultraviolet absorbent as well as a preparation method and application thereof. According to the invention, a triazine derivative structure of a hyperconjugated system of (para-ester-triazine-BP-2-triazine-para-ester) is designed, the conjugated system is extended, charges in molecules are transferred, an ultraviolet absorption spectrum is widened, and an ultraviolet light absorber with a strong absorption effect on UVA and UVB is formed. The para-ester is introduced into the ultraviolet absorbent, and the vinyl sulfone group of the para-ester can be subjected to Michael addition reaction with amino (-NH2) in nylon to form a stable covalent bond, so that the ultraviolet absorbent is firmly combined on nylon fibers, and the washability is enhanced.

The invention discloses a fluorescent resin composition of a hybrid system and application of the fluorescent resin composition in 3D printing, an epoxy fluorescent monomer has excellent light stability and can be connected into resin molecules in an epoxy polymerization mode, the stability is greatly improved, and the service life of a material is prolonged. In addition, due to the characteristic absorption of the epoxy monomer on 355 nm ultraviolet light, scattering of exciting light can be effectively inhibited, and the printing precision is improved. The epoxy monomer can also be subjected to [2 + 2] cycloaddition reaction under the irradiation of 400 nm ultraviolet light, a four-membered ring structure is formed, an original conjugated system is changed, the photochromic function and the erasable property are achieved, no chemical consumption exists in the conversion process, and the service cycle is obviously prolonged.

The invention provides a tumor diagnosis and treatment agent with a targeting function and a preparation method thereof, and belongs to the field of biomedicine. According to the method, triphenylamine is taken as a starting unit, a pi conjugated system is expanded through a benzothiadiazole group, pyridinium salt is introduced as a strong electron withdrawing unit, alkyl chains with different lengths are connected into molecules, and finally, diagnosis and treatment integrated molecules with fluorescence imaging and tumor targeting functions are synthesized. The fluorescent targeted diagnosis and treatment agent not only has good tumor cell plasma membrane targeting accuracy, but also has excellent aggregation-induced emission performance which is obviously higher than that of a traditional commercial photosensitizer, so that accurate targeted localization of tumor cells is realized. Meanwhile, the fluorescent targeting diagnosis and treatment agent TBPPM has excellent singlet oxygen generation capability, and further shows relatively strong tumor cell killing capability. Therefore, the prepared fluorescent targeted diagnosis and treatment agent provides a new material for accurate positioning and treatment of tumors under fluorescence guidance, and also provides a new thought for development of targeted diagnosis and treatment agents for breast cancer.

The invention discloses a polycyclic aromatic compound and an organic electroluminescent device, and relates to the technical field of organic photoelectric materials. The polycyclic aromatic compound has a structure as shown in formula I. In the formula I, ring A is a substituted or unsubstituted benzene ring; at least one of Ra, Rb, Rc and Rd is selected from a formula I-a; wherein Z3 is respectively and independently selected from Si or Ge. The parent nucleus structure of the polycyclic aromatic compound provided by the invention has a B-N coordination structure, a carbazole structure and a large conjugated system fused by multiple aromatic rings, a rigid skeleton is formed by B and N atoms, and excessive aggregation of molecules can be inhibited by steric hindrance of Si or Ge, so that carrier transport blocking or exciton quenching caused by aggregation is avoided, and the performance of the compound is improved. Meanwhile, the dissolvability and processability of the material are improved, and the stability and efficiency of device performance are further guaranteed. The service life and the efficiency of a device prepared from the doping material are obviously improved.