19 results about "Electronic effect" patented technology

The application belongs to the technical field of catalytic synthesis, and particularly relates to application of a Lewis acid-base pair in catalyzing polymerization of functionalizable monomers. Common polymerization methods have poor controllability for polymerization of monomers containing polyene groups, alkyne groups and conjugated diene groups, and the molecular weight of the obtained polymer is uncontrollable at low monomer conversion, and the molecular weight distribution is wide, and crosslinking occurs at high monomer conversion. The application utilizes a specific Lewis acid-base pair, and by adjusting the electronic effect and steric hindering effect of the Lewis acid and the Lewis base, active controllable polymerization of the functionalizable monomers can be catalyzed, and a polymer with a clear structure and containing functionalizable sites is obtained, the molecular weight is controllable, the molecular weight distribution is narrow, the end group structure is controllable, the position and density of the functionalizable sites are conveniently adjusted, an efficient platform is provided for post-modification preparation of functional high molecular materials, and functional high molecular materials are prepared by combining click reaction.

This invention discloses a zinc-based mixed imidazole ligand metal-organic framework (ZIF) adsorbent material for highly efficient separation of CF4 / N2 and its preparation method. By strategically controlling the ratio of benzimidazole and 2-nitroimidazole ligands, a series of ZIF materials with large specific surface areas and suitable pore structures for adsorbing and separating CF4 / N2 are prepared. The 2-nitroimidazole provides a certain polarization effect to the framework, and its own electron-withdrawing effect and relatively long Zn-N bond length (easily broken) make it suitable as a parent material for ligand exchange. The benzene ring on the benzimidazole provides more adsorption sites for the framework. The metal-organic framework adsorbent material prepared by this invention can achieve highly efficient adsorption of CF4 and selective separation of CF4 / N2, exhibiting excellent performance and significant economic and social benefits.

The application provides a preparation method of a carbon material Ru-based catalyst and application of the carbon material Ru-based catalyst in partial hydrogenation of benzene to cyclohexene. According to the activity test results, the introduction of the carbon material improves the benzene conversion rate and appropriately increases the selectivity of cyclohexene. This is mainly due to the rich functional groups on the surface of the carbon material and the unique electronic effect, which increases the dispersion of the metal Ru and stabilizes the Ru δ+ In the reducing reaction system. The application selects a fixed bed as an evaluation device of the cyclohexene, avoids the problems such as difficult separation of products and catalysts in the traditional autoclave device, is beneficial to continuous production of the cyclohexene and provides certain convenience for subsequent industrial application.

This invention provides an anthracene-based fluorescent material, its preparation method, and its applications. The anthracene-based fluorescent material is as shown in Compound I. The compounds of this invention utilize the electron-donating effect of aromatic amine units such as carbazole and the electron-withdrawing effect of phosphonyl / sulfonyl groups, effectively improving the electron and hole transport capabilities of the molecules. Furthermore, the steric hindrance effect, resulting in a distorted molecular configuration, can suppress intermolecular interactions, thereby reducing the device efficiency roll-off caused by concentration quenching. The thermal exciton mechanism enables these molecules to achieve an exciton utilization rate exceeding that of traditional fluorescent molecules by 25%.

This invention discloses a class of porphyrin-based A-D-A type polymer photovoltaic materials, their preparation methods, and applications. The invention utilizes a porphyrin-DPP system constructed through Sonogashira coupling, placing the donor unit at the center of the A-D-A structure. This A-D-A structure more effectively enhances the intramolecular push-pull electronic effect, promoting intramolecular charge transfer and thus significantly broadening and redshifting the light absorption range of the polymer. Furthermore, the A-D-A structure facilitates more ordered and compact intermolecular stacking, promoting the expansion of π-π conjugation and potentially increasing the carrier mobility of the material. This lays the material foundation for obtaining higher short-circuit current densities and fill factors in devices.

This invention relates to the field of catalyst technology, specifically to a twinned palladium catalyst, its preparation method and application, and a method for hydrogenating carboxybenzaldehyde. The twinned palladium catalyst contains palladium and carbon and has a spherical morphology. The spherical shape of the twinned palladium catalyst not only provides abundant surface reaction sites for the hydrogenation reaction, but the synergistic electronic effect caused by the twinned interface also significantly improves the catalyst's activity and stability. When used for the hydrogenation of carboxybenzaldehyde (e.g., p-carboxybenzaldehyde), it has the advantages of high substrate conversion and high catalyst stability.

In the present application, the catalyst for preparing polyethylene elastomer, ethylene and co-catalyst are dispersed in organic solvent to carry out polymerization treatment to obtain polyethylene elastomer. The catalyst for preparing polyethylene elastomer provided by the present application is cheap and easy to obtain. The catalyst has a specific molecular structure. In the process of preparing polyethylene elastomer, the unique steric hindrance and electronic effect of the catalyst make it exhibit excellent catalytic activity. The prepared polyethylene elastomer has excellent elasticity and mechanical properties while improving the branching degree and narrow molecular weight distribution. The polyethylene elastomer can be widely applied in the fields of automobile, photovoltaic, medical treatment, packaging and the like to meet the use requirements of high-performance polyethylene elastomer in these fields.

The application belongs to the technical field of conjugated diene polymerization, and particularly relates to a phosphine quinoline ligand, a phosphine quinoline iron complex, a preparation method thereof and application thereof in catalyzing conjugated diene polymerization. The phosphine quinoline ligand and the iron complex are respectively shown as formula I and formula II. The iron complex is a bidentate N, P-coordination catalyst, has a single catalytic active center, and can realize high-activity and high-selectivity polymerization of conjugated dienes by regulating ligand electronic effects, space effects and polymerization conditions. The iron complex only needs 5 equivalents of dry methylaluminoxane to be activated, and still maintains high activity at high temperature (100 DEG C). The obtained polyconjugated diene has narrow molecular weight distribution, and microstructure (cis-1, 4, trans-1, 4, 3, 4 or 1, 2) can be accurately regulated. The reaction system is green, environmentally friendly, low in cost and excellent in thermal stability, and is suitable for industrialized production of high-performance elastomer materials.

This invention discloses a class of meso-position asymmetricly substituted porphyrin organic photovoltaic materials, their preparation methods, and applications. The meso-position asymmetricly substituted porphyrin organic photovoltaic materials of this invention use the porphyrin ring as the central charge-donating group. Different electron-withdrawing groups are connected to the two symmetrical meso-positions of the porphyrin to synthesize the target molecule, forming an intramolecular push-pull electron effect. This effectively enhances intramolecular charge transfer, broadens the molecule's light absorption range, and improves its light absorption capacity. By changing different electron-withdrawing groups, the energy levels of the molecule can be precisely adjusted, optimizing molecular packing performance and further improving the photovoltaic performance of the material. This invention demonstrates the feasibility of meso-position asymmetric modification of porphyrin, providing a new direction for the molecular design of meso-position porphyrin materials for organic solar cells.

This invention belongs to the field of lithium-ion and lithium metal battery technology, and provides a carboxylic acid ester-based compound and its preparation method, an electrolyte solvent, and an electrolyte. The compound provided by this invention has a carboxylic acid ester skeleton. Utilizing its low viscosity characteristics, it works in conjunction with highly flexible silicon-oxygen chains to effectively disrupt the crystallization arrangement of the solvent molecules, reducing the freezing point and low-temperature viscosity of the electrolyte solvent. This ensures excellent liquid flowability and ion transport kinetics of the electrolyte at low temperatures, thereby guaranteeing good electrochemical performance of the lithium-ion battery at low temperatures. The silicon-oxygen bond and fluorine atoms can jointly regulate the solvation structure, weakening the interaction between the solvent molecules and Li through steric hindrance and electronic effects. + The binding energy barrier induces lithium salt anions to enter the first solvated sheath layer, forming more contact ion pairs and aggregates, enabling preferential decomposition of anions and construction of a stable interface layer rich in inorganic matter, dense, and with high ionic conductivity. This effectively inhibits lithium dendrite growth and side reactions, while improving the antioxidant stability and safety of the electrolyte.

The present application relates to a kind of catalytic system for olefin hydroformylation reaction and the method of olefin hydroformylation reaction;Catalytic system includes: fluorine-containing bisphosphinite ligand Ln and rhodium-manganese bimetallic synergistic system.The present application also relates to the preparation method of fluorine-containing bisphosphinite ligand Ln.The fluorine-containing bisphosphinite ligand of the present application is creatively introduced, and its fluorine-containing structure can significantly enhance the chemical inertness of ligand molecule itself, effectively resist decomposition, hydrolysis and degradation under high temperature.The introduction of manganese can not only adjust the catalytic performance of rhodium center through electronic effect, but also can form synergistic effect with rhodium in the reaction, and stabilize the key reaction intermediate, so as to enhance the firmness of the entire catalytic framework at the molecular level, further inhibit the precipitation and agglomeration of rhodium metal and inactivation.In propylene hydroformylation reaction, the conversion rate is generally as high as 99%;In the wide process parameter interval, the conversion rate is not less than 96%, the activity window is wide, and it has great industrial application prospect and economic benefit.

This invention discloses a lithium-containing organic cathode material, the preparation method of which includes the following steps: S1. Mixing 1,4-dihydroxyanthraquinone, lithium hydroxide monohydrate, and a solvent, stirring and reacting under heating conditions, and then removing the solvent to obtain a solid powder; S2. Heat-treating the obtained solid powder under an inert atmosphere at a temperature above 200°C, and then cooling to obtain the product. This invention, through rational molecular structure design, directly introduces lithium into the molecular framework of 1,4-dihydroxyanthraquinone, thereby significantly expanding its application range. Based on this, matching with a PVDF-based polymer electrolyte effectively reduces the dissolution problem caused by contact with polar solvents. Benefiting from the electron-withdrawing effect and space charge effect of adjacent carbonyl functional groups, this material achieves a record-breaking high discharge plateau—approximately 3.4 V. Thanks to its high oxidation plateau (above 3.2 V), it can be stored for a long time in air.

The application provides a preparation method of a high-conductivity molybdenum disulfide nanosheet catalyst, comprising the following steps: 1) mixing a metal molybdenum salt, a metal chromium salt and thiourea to obtain a first composite carrier; 2) dispersing the first composite carrier in water to obtain a first composite carrier suspension; 3) reacting the first composite carrier suspension under a sealed condition, and post-treating the obtained product; 4) dispersing the obtained second composite carrier and a metal scandium salt in water, and reacting to obtain a catalyst. The molybdenum disulfide nanosheet catalyst prepared by the application introduces transition metal atoms (such as Cr and Sc), utilizes the local electronic effect and defect effect generated in the molybdenum disulfide, creates more carriers, makes the electrons efficiently transfer in the molybdenum disulfide nanosheet catalyst, and improves the intrinsic conductivity of the catalyst; the prepared catalyst has good performance, a good layered structure and uniform dispersion; compared with the existing commercial platinum-based catalyst, the catalyst has a lower cost.

This invention belongs to the field of rubber tire technology, specifically relating to a low-temperature resistant silicone rubber tire and its preparation method. This silicone rubber tire is made using methyl vinyl silicone rubber as the colloid and functional additives as additives, through a mixing and vulcanization process. The functional additives are obtained by modifying the surface of nano-silicon carbide with hyperbranched macromolecules. These hyperbranched macromolecules can participate in the vulcanization process of silicone rubber, thereby achieving cross-linking and entanglement with the molecular chains of methyl vinyl silicone rubber, presenting a three-dimensional network structure. This allows the nano-silicon carbide to efficiently exert its reinforcing effect as a cross-linking core, improving the mechanical strength and wear resistance of the silicone rubber. Furthermore, the rigid fluorene rings of the hyperbranched macromolecules can suppress the crystallization tendency of silicone rubber at low temperatures through steric hindrance and electronic effects, effectively improving the low-temperature resistance of the silicone rubber tire.

This invention belongs to the field of catalyst technology and relates to the preparation and application of a bimetallic phthalocyanine catalyst. This invention employs a simple one-pot method to prepare the bimetallic phthalocyanine catalyst. The preparation method is simple, low-cost, and can be scaled up for production. The obtained bimetallic phthalocyanine catalyst, due to its unique electronic effects and spatial configuration, exhibits excellent acid hydrogenation catalytic performance. When applied to the reaction of acid hydrogenation to alcohols, it demonstrates high yield and has broad application prospects.

The application belongs to the field of high polymer materials, and particularly relates to a heteronuclear multi-metal complex, a preparation method and application thereof in cyclic ester polymerization. The core of the heteronuclear multi-metal complex is to introduce two or more metal ions with different Lewis acidities into the same molecular skeleton through a multi-tooth ligand, and to realize more precise synergistic regulation by using the differentiated electronic effects and steric hindrance between the heteronuclear metal ions. Specifically, by optimizing the types, proportions and coordination environments of the metal ions with different Lewis acidities, the catalytic activity of cyclic ester ring-opening polymerization and the controllability of polymer molecular weight are improved, so that a more optimal catalytic effect is realized in terms of efficient polymerization and structure controllability.

The application belongs to the technical field of organic photoelectric material, and discloses a kind of tricyclic metal iridium (III) complex containing viologen unit and a preparation method and application thereof, and the iridium (III) complex is composed of two ring metal C^N ligands with strong electron-withdrawing effect modification and a C^N ligand with electroactive viologen substituent group;Two ring metal C^N ligands are modified by electron-withdrawing group to regulate the orbital energy level of iridium (III) complex, reduce the emission energy, promote the near-infrared luminescence of the complex before electric stimulation, utilize the strong electron-withdrawing ability and reversible redox characteristics of viologen substituent group, combine the rich excited state properties of iridium (III) complex, under electric stimulation, the reversible redox reaction of iridium (III) complex occurs, and the electric stimulation phosphorescence response of the material is realized;With the electron-donating property of viologen unit after electric reduction, the transition mode of iridium complex is changed, and the C^N ligand containing viologen substituent group is forced to participate in the excited state transition, realizing the luminescence conversion from near-infrared light to visible light.

The application provides a cationic nickel complex shown in formula (II) and a preparation method and application thereof. By closing a semi- sandwich type ring structure and containing an axial phenyl ring η 6 Coordination, an electronic effect and space steric hindrance of the axial phenyl ring to the cationic nickel metal center are regulated. In a single active center, the catalyst simultaneously forms two kinds of active centers with high steric hindrance and low steric hindrance, and can directly obtain a bimodal distribution ultrahigh molecular weight polyethylene thermoplastic elastomer in a single reactor by one-step catalysis of ethylene polymerization. Experiments show that the catalyst prepared in the application exhibits high activity under mild conditions, and can regulate the molecular weight distribution of the product. The obtained bimodal polyethylene has high strength, high elasticity of the high molecular weight component and good processing fluidity of the low molecular weight component, and has a moderate branching degree, thereby realizing excellent comprehensive performance, significantly improving the processing process, and having outstanding industrial application potential and market prospect.

The application discloses a rare earth catalyst, which comprises a first component, a second component, a third component, a fourth component and a fifth component, and the fifth component is an olefin compound or a siloxane compound. By adding the fifth component as a ligand, the fifth component can be in-situ complexed with a neodymium catalyst, the steric hindrance and electronic effect near an active center are regulated, the selectivity of the active center to the coordination insertion of a butadiene monomer and a vinyl branch is regulated, and thus the generation of gel is reduced by inhibiting the crosslinking between rubber molecules. Meanwhile, the butadiene monomer can be freely coordinated with the catalyst active center, and then chain growth is realized through insertion, so that the high activity and high cis-selectivity polymerization characteristics of the rare earth catalyst are reserved. The application further discloses a preparation method of the rare earth catalyst and application of the rare earth catalyst in preparation of rare earth butadiene rubber. By using the rare earth catalyst, the crosslinking between rubber molecules can be inhibited, so that the generation of gel is reduced, and the rare earth butadiene rubber with low gel content is prepared.