68 results about "Coordination site" patented technology

According to the method for recycling the waste lithium ion battery positive electrode material aluminum foil, double-bond addition is conducted on ureido of allylurea and maleimide, meanwhile, thiazolecarboxylic acid amino cyclization is conducted, ternary heterocyclic molecules containing ureido, thiazole rings and carboxyl are generated, S atoms, N atoms and O atoms form tridentate coordination sites, and the leaching rate of aluminum is increased.

The invention provides a surface gold-doped platinum-based catalyst as well as a preparation method and application thereof, and relates to the technical field of catalyst preparation and application. The method comprises the following steps: firstly, preparing a platinum-based nanoparticle catalyst by adopting an impregnation calcination reduction method, then regulating and controlling lattice strain through ligand mediation, and finally inducing transition metal on the surfaces of nanoparticles to discharge through a transition metal discharge inducing method so as to realize surface doping of gold, thereby obtaining the platinum-based electrocatalyst with the gold-doped surface. The transition metal is induced to discharge to replace the transition metal with gold while the lattice strain regulation is mediated by the ligand, the dissolution of platinum is reduced through the unsaturated coordination site action of gold and platinum while the surface is purified, the transition metal can be induced to discharge to remove the transition metal on the surface of the catalyst, and the transition metal and the gold can be synergistically utilized to improve the catalytic activity of the catalyst. When Au dispersion is induced by strain, surface migration of Au atoms can be inhibited by surface strain generated by the ligand, atomic-scale dispersion of the Au atoms is promoted, and catalytic activity is improved.

The present application provides an adhesive composition for a polarizing film, which contains a cationic trapping agent having a coordination site capable of coordinating a metal component with 2 or more teeth, and a reactive group. In particular, the present application provides a polarizing film having a polarizer, and an adhesive layer adjacent to the polarizer or an optical film other than the polarizer, wherein the adhesive layer is a cured product layer of the adhesive composition for a polarizing film. It is preferable that the polarizer contains a metal component capable of becoming a divalent metal cation in water.

The application relates to the technical field of catalysts, and discloses a palladium / alumina catalyst and a preparation method and application thereof. A Schiff base phosphine cyclodextrin ligand is synthesized through two-step reactions of nucleophilic substitution and Schiff base condensation, the molecular structure of the ligand covalently bridges the hydrophobic cavity of beta-cyclodextrin and the strong coordination site of diphenylphosphine through a rigid Schiff base bond; subsequently, the phosphine group of the ligand is coordinated with a palladium salt under a specific pH, and a uniform and stable palladium-ligand colloid precursor is formed under the assistance of a directing agent and a stabilizing agent; finally, the colloid is mixed with an alumina carrier for impregnation, drying, and a palladium / alumina catalyst is obtained. Through molecular design and process innovation, the problems of low activity, poor selectivity and insufficient stability of traditional catalysts are solved. When the catalyst is used for preparing hydrogen peroxide by hydrogenating anthraquinone, the hydrogenation efficiency is significantly improved, the selectivity is extremely high, and the cycle stability is excellent, so the catalyst has important industrial application value.

The invention discloses a monatomic iron anchored covalent triazine skeleton and a green synthesis method and application thereof, and the method specifically comprises the following steps: in an air atmosphere, mixing 1, 4-terephthalaldehyde, p-phenylenediamine hydrochloride and a basic catalyst, dissolving in a solvent, and carrying out gradient heating at 60-120 DEG C for condensation reaction; when the reaction temperature is 120 DEG C, an iron source is added, the reaction temperature is maintained for continuous reaction to obtain the monatomic iron anchored covalent triazine skeleton Fe-CTFs, and the prepared Fe-CTFs has good application in catalytic degradation of pollutants. According to the preparation method, a gradient heating method is adopted, abundant N coordination sites can be subjected to coordination reaction with metal iron ions under a high-temperature condition, a more stable Fe-Nx coordination structure is formed, and thus the stability of the catalyst is enhanced. Monatomic iron endows Fe-CTFs with more reaction active sites and more excellent oxidation-reduction performance, and has a wide application prospect.

The application discloses a Pd@MOF-APBA catalyst and a preparation method thereof, and is characterized in that Pd(OAc)2 is used as a precursor, 3-amino-4-(pyridine-2-yl)benzoic acid (APBA) is used to carry out ligand exchange on MOF-808 to obtain MOF material MOF-APBA with Pd coordination sites, and the MOF material is combined with Pd(OAc)2 to obtain the Pd@MOF-APBA catalyst. The application has high catalytic activity, is easy to separate and recycle, and can still maintain high catalytic activity when recycled and reused for multiple times.

The invention discloses a high-load cobalt monatomic catalyst with a three-dimensional confinement structure as well as a preparation method and application of the high-load cobalt monatomic catalyst. A three-dimensional cyclodextrin-based covalent organic framework 3D-CD-COF, which is constructed by seven-(6-amino-6-deoxy)-beta-cyclodextrin (7ACD) and aromatic dicarboxaldehyde (terephthalaldehyde or 4, 4 '-biphenyl dicarboxaldehyde), is used as a carrier, multiple coordination sites are constructed through salicylaldehyde grafting, and high-loading anchoring of cobalt single atoms is realized; cobalt single atoms are uniformly dispersed in a three-dimensional intercommunicated pore channel in a CoN1O3 coordination form, the loading capacity reaches 13.0-14.0%, and a three-dimensional confinement structure can inhibit four-electron oxygen evolution side reaction. The catalyst has high hydrogen peroxide Faraday efficiency and high yield, compared with Co-CD without a three-dimensional confinement structure, the activity and selectivity are remarkably improved, and an efficient technical scheme is provided for electrochemical preparation of hydrogen peroxide.

The invention relates to an ether bond type covalent organic polymer (TPTF-AO) containing an amidoxime group and a synthesis method thereof. The method comprises the following steps: by taking 2, 4, 6-tri (4-hydroxyphenyl)-1, 3, 5-triazine and tetrafluoroterephthalonitrile as raw materials, constructing a covalent organic polymer precursor (TPTF) connected by a stable ether bond through nucleophilic substitution reaction of hydroxyl and fluorine atoms; further, the cyano group in the TPTF is subjected to amidoximation reaction under a mild condition and is efficiently converted into an amidoxime group, and the target product TPTF-AO is obtained. The polymer has a rigid skeleton connected by ether bonds and a mesoporous-macroporous composite pore channel structure, and has excellent chemical stability, thermal stability, rapid mass transfer capability and high-density metal ion coordination sites. The bottleneck that a traditional imine bond material is insufficient in stability is broken through, the problem that functional modification and skeleton stability are difficult to be compatible is solved, and the obtained material has wide application prospects in the fields of uranyl ion adsorption, catalysis, energy storage and the like.

Coordination complexes are provided comprising at least one metal atom; and organic ligands comprising one or more coordination sites associating with the at least one metal atom. Related methods and articles having a metal carbide coating are also provided, the metal carbide coating being derived from one or more coordination complexes.

The invention discloses a Zr-based metal organic framework containing squaramide groups and a preparation method and application thereof, and the preparation method comprises the following steps: adding tetra-coordinated carboxylic acid ligands H4HPA, H4TPCB or H4NDTB, ZrCl4 and benzoic acid into N, N-dimethylformamide, and carrying out solvothermal reaction to generate crystalline products Zr-MOF-1, Zr-MOF-2 and Zr-MOF-3; adding the obtained Zr-MOFs crystals into a DMF (Dimethyl Formamide) solution containing SQ ligands, and standing in a drying oven at 120 DEG C for two days to enable the SQ ligands to be inserted into unsaturated coordination sites of Zr6 clusters of the three MOFs, so as to obtain Zr-MOF-1-SQ, Zr-MOF-2-SQ and Zr-MOF-3-SQ; according to the present invention, the synthesized Zr-MOF-1-SQ, Zr-MOF-2-SQ and Zr-MOF-3-SQ have advantages of excellent chemical stability, accurately controllable catalytic activity center and excellent heterogeneous catalytic performance, and can maintain the structural integrity after multiple catalytic cycles, and the synthesis method is simple, convenient and controllable so as to solve the problem of poor stability of the traditional transition metal-based squaramide MOFs.

The invention relates to the technical field of fine chemical additives, and discloses a method for preparing an organic acid bismuth with moderate reaction conditions. An organic acid ligand has multiple coordination sites, including O atoms on a polycarboxylic acid group, N atoms on an imidazole, and two N atoms provided by two Schiff bases. A benzene ring and an imidazole ring are connected by a C-N single bond, and the two can rotate arbitrarily, so that the organic acid ligand can be suitable for the coordination of various structures, thereby obtaining a stable structure; an ultrasonic-hydrothermal method can be used to quickly heat up and provide a continuous impact force, thereby significantly improving the yield of the organic acid bismuth; an organic acid ligand with multiple coordination sites is synthesized, and screening test conditions are optimized to obtain an organic acid bismuth with high yield and good stability, thereby improving the problem of poor coordination between conventional organic acids and bismuth, and the method has moderate reaction conditions, a short production cycle, and a high utilization rate of a bismuth source, and is suitable for mass production.

The invention provides a method for preparing carboxylic ester by catalyzing olefin hydrogen esterification through chloralkane reinforced Pd-coated polyion liquid, which comprises the following steps: carrying out free radical polymerization reaction on an ionic liquid monomer containing P and N coordination sites to obtain porous polyion liquid, and then dipping in a Pd salt or Pd complex solution to obtain a Pd-loaded porous polyion liquid catalyst. Chloroalkane and methanol are used as a mixed solvent, and the Pd-loaded porous polyion liquid catalyst shows excellent activity, selectivity and stability in C3 + olefin hydrogen esterification reaction, and has a good substrate application range.

The application discloses chiral bis-thiophene-bis-nitrogen-oxygen ligands BbTh-2NO and BTh-2NO. The ligands comprise bis-thiophene groups and nitrogen-oxygen groups (sulfur atoms of the bis-thiophene and oxygen atoms of the nitrogen-oxygen groups belong to electron-rich coordination sites), can form six-membered ring coordination with Lewis acid soft metal palladium, thereby generating chiral ligand metal palladium complexes, and are applied as chiral ligands in asymmetric catalytic reactions. Therefore, the application has important application value in the field of asymmetric catalytic synthesis, and a synthesis method thereof is very economical and simple. The application also has good air stability, wide applicability and good compatibility for various substituents.

The invention relates to the technical field of material science, in particular to a full-coordination covalent organic framework material as well as preparation and application thereof. The full-coordination covalent organic framework material provided by the invention has a double-layer close packing structure with a main hole of 9.5 angstroms, a narrow hole of 3.0 angstroms and an interlayer spacing of 4.1 angstroms; the nitrogen content is 51.85%, and the phosphorus content is 26.50%. Nitrogen and phosphorus elements serve as multiple coordination sites and are directly coordinated with lanthanide ions, the close packing structure amplifies the influence of the ion radius and the coordination number on the coordination effect, the adsorption capacity of europium (Eu < 3 + >) of 334 mg / g is achieved, and the separation factor of the europium (Eu < 3 + >) to cesium (Cs < + >) and strontium (Sr < 2 + >) reaches up to 7153 and 9660. The full-coordination covalent organic framework material structure is proved to have good selectivity on the lanthanide elements, and high-capacity adsorption and enrichment of the lanthanide elements can be realized.

The invention discloses a preparation method and application of a post-modified metal organic framework material for catalytically oxidizing benzyl alcohol into benzaldehyde, and belongs to the technical field of photocatalytic materials. Zr-based MOF-808 is used as a parent framework, organic dye eosin Y (eosin Y, EY) is used as a functional unit, and the parent framework and the functional unit are coordinated and anchored to obtain the post-modified metal organic framework material EY-MOF-808. The post-modified metal organic framework material EY (at) MOF-808 has abundant unsaturated coordination sites, provides a way for distinguishing the combining capacity of objects with different groups and improving reactivity and selectivity, and effectively avoids excessive oxidation of benzaldehyde. The EY-coated MOF-808 is suitable for catalyzing benzyl alcohol with a plurality of substituent groups, and corresponding benzaldehyde is obtained at the selectivity of more than 99%. In addition, the EY-coated MOF-808 can be recycled for four times, the selectivity is not reduced, and toxic dyes are prevented from being released into the environment.

The application relates to a preparation method of a post-modified metal organic framework material for catalytically oxidizing benzyl alcohol into benzaldehyde and application thereof, and belongs to the technical field of photocatalytic materials. A Zr-based MOF-808 is taken as a matrix framework, organic dye eosin Y (EY) is taken as a functional unit, and the two are coordinated and anchored to prepare a post-modified metal organic framework material EY@MOF-808. The post-modified metal organic framework material EY@MOF-808 has rich unsaturated coordination sites, provides a path for distinguishing the guest binding capacity with different groups, improving reactivity and selectivity, and effectively avoids the excessive oxidation of benzaldehyde. The EY@MOF-808 is suitable for catalyzing benzyl alcohol with various substituents, and corresponding benzaldehyde is obtained with a selectivity of greater than 99%. In addition, the EY@MOF-808 can be recycled for four times and the selectivity is not reduced, and the release of toxic dyes into the environment is prevented.

The invention discloses a chiral dinitrogen-oxygen ligand based on bipyridine bridging, a preparation method of the chiral dinitrogen-oxygen ligand and application of the chiral dinitrogen-oxygen ligand in asymmetric catalytic reaction, and belongs to the field of organic synthesis and asymmetric catalysis. The invention provides a chiral dinitrogen-oxygen ligand based on bipyridine bridging, which is characterized in that two chiral nitrogen-oxygen units (spiro or long-arm structures) with clear structures are bridged through a rigid bipyridine skeleton, so that a chiral catalytic microenvironment with high rigidity and clear spatial orientation is accurately constructed. According to the structural design, nitrogen atoms of dipyridyl and oxygen atoms of nitrogen-oxygen groups are effectively integrated to serve as multiple coordination sites, efficient coordination with multiple metal ions such as Mn (II), Fe (II), Co (II), Ni (II), Cu (II) and Zn (II) can be achieved, a stable six-membered ring chelating structure is preferentially generated, and therefore the high-performance chiral ligand-metal composite material is prepared. The catalyst shows an excellent catalytic effect in an asymmetric cycloaddition reaction.

The invention discloses Ru-doped HSA and ZIF-67 nano-enzyme and application thereof, and relates to the technical field of nano-enzyme and colorimetric detection.The Ru-doped HSA and ZIF-67 nano-enzyme is prepared through the steps that S1, RuCl3 or Ru (III) soluble compounds and HSA are mixed in a buffer solution with the pH being 5.5-7.5 and stirred for 30-120 min, and a Ru-HSA complex is obtained; s2, a Ru doped ZIF-67 nanometer hybrid body is obtained; s3, obtaining the Ru active site-containing nano enzyme; s4, obtaining a surface modified nano enzyme; s5, obtaining a standardized reagent; s6, obtaining a detection result; according to the Ru-doped HSA and ZIF-67 nano-enzyme and the application thereof, Ru and HSA form a coordination / coating complex before crystallization, then the coordination / coating complex serves as a crystal nucleus to participate in ZIF-67 growth, steric hindrance and coordination sites of protein can be used for conducting spatial confinement on metal, and agglomeration of the metal in the growth process is inhibited; and then promoting Ru to exist in a sub-nanocluster or dispersed atom form through short-time reduction or low-temperature aging, so that catalytic sites are highly dispersed in space and are exposed to pore channels / surfaces.

This invention provides a highly selective and sensitive fluorescent probe for mercury ions, its preparation method, and its applications, belonging to the fields of chemical sensing materials and environmental monitoring technology. This invention connects 4-(1,2,2-triphenylvinyl)phenol, which exhibits aggregation-induced emission, and a guanosine derivative with multiple coordination sites, via a flexible chain to obtain a fluorescent probe with the structure shown in Formula I. This fluorescent probe not only overcomes the problems of large differences in solubility and reactivity between 4-(1,2,2-triphenylvinyl)phenol and guanosine derivatives, making coupling difficult, but also possesses high sensitivity and selectivity; its detection limit reaches 12.24 nM, effectively detecting trace mercury pollution in samples. It can also accurately identify mercury ions in water samples containing multiple high concentrations of metal ions, demonstrating high accuracy in real water samples. It is suitable for the accurate determination of mercury ions in complex environmental water samples and has good practical application value in the field of environmental monitoring. Formula I

The invention relates to a super-crosslinked microporous polymer phosphine ligand as well as a preparation method and application thereof, and belongs to the technical field of heterogeneous catalysts. The structure of the phosphine ligand is shown as a formula (I), the ligand is provided with a plurality of coordination sites, the ligand is internally provided with a hypercrosslinked microporous framework with a highly ordered crystal structure, and the phosphine ligand has a large surface area and clear porosity, can effectively adsorb H2 / CO, and provides more reaction sites. When the ligand is used for preparing the catalyst which is easy to separate, high in conversion rate and high in selectivity, the conversion rate of isooctene and the generation selectivity of isononanal can be improved.

The invention discloses porphyrinyl COF based on double-bridging monomers, aerogel, a preparation method and application, and belongs to the field of advanced functional materials. According to the invention, Tp-PDA-COF is prepared by using two bridging monomers, namely 2, 4, 6-triformyl phloroglucinol (Tp) and 2, 6-pyridinedicarboxaldehyde (PDA), on the basis of porphyrinyl COFs, and an electron withdrawing group in Tp optimizes the orbital energy level of a metal ligand and promotes electron transfer and formation of a coordinate bond; pDA enables COF to exist in a tetragonal topological structure, so that steric hindrance is reduced, coordination sites are exposed, selectivity and sensitivity to metal ions are improved, and rapid and sensitive visual fluorescence detection is realized; the Tp-PDA-COF aerogel is prepared by further combining polyvinyl alcohol, so that the problem of fluorescence quenching of porphyrin-based COFs in a solid state is solved, and the purpose of developing a COFs material with double functions of sensitive detection and efficient adsorption is achieved.

The invention relates to the technical field of solar cells, in particular to a stabilizer, a perovskite precursor solution, a perovskite solar cell, a preparation method of the perovskite solar cell, a perovskite laminated solar cell and a photovoltaic module. The stabilizer provided by the invention comprises a compound with a general formula of A-R-B, r comprises at least one of an alkyl carbon chain, an aryl-containing carbon chain or a heteroatom-containing carbon chain; a comprises at least one of a thioether group, a sulfydryl group and a sulfo-carboxyl group; b comprises at least one of a sulfonic group, a carboxyl group or a carbamic acid group; thioether group, sulfydryl or sulfo-carboxyl in the stabilizer can be used as a main coordination site to form a strong coordination bond with Pb < + > to improve the coordination ability, and sulfonic acid group, carboxyl or carbamic acid group can be used as an auxiliary coordination site and can also be used as a proton source to synchronously solve two key degradation paths of cation deprotonation and iodide ion oxidation, so that the stability of the stabilizer is improved. The monomolecular bifunctional stable effect is achieved, the coordination capability and stability are improved, and the stability of the perovskite precursor solution can be remarkably improved.

The present invention relates to an acid-base dual-functional framework material catalyst, a preparation method, and an application thereof, belonging to the technical field of composite materials. The present invention utilizes multiple strong coordination sites on polyazoles, coordinates and grafts them with Zr-based MOFs containing certain defect sites and acidic sites, then combines strongly basic 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) with the supported polyazoles to form an alkaline ionic liquid structure, thereby preparing a dual-functional framework material containing acidic and basic sites. The prepared acid-base dual-functional framework material catalyst not only has the characteristics of strong catalytic activity, large specific surface area, and adjustable solid loading, but also, during the reaction process, the acid-base active sites are not neutralized or lost, and has extremely strong catalytic stability. It can be used in the transesterification reaction of dimethyl carbonate and diethyl carbonate to prepare ethyl methyl carbonate.

The invention provides a PAF supported ruthenium catalyst as well as a preparation method and application thereof, and relates to the technical field of heterogeneous catalyst preparation. The catalyst comprises a PAF material containing a CNN ligand and a ruthenium active center, the CNN ligand has a tridentate chelating structure formed by N-heterocyclic carbene and bipyridine, coordination sites can be provided for ruthenium atoms, and meanwhile, dissociation of the ruthenium atoms and the ligand is hindered by stable metal chelating, so that the stability and catalytic performance of the catalyst are improved. The catalyst provided by the invention can catalyze ester hydrogenation reduction and polyester hydrogenation depolymerization under mild conditions, is easy to separate from reaction products, and has good recycling performance.

The invention relates to the technical field of environmental monitoring and analytical chemistry, in particular to a fluorescent probe and a preparation method thereof. The structural formula of the fluorescent probe is shown in the formula I, and the fluorescent probe has coordination sites highly compatible with Co < 2 + > ions, has high sensitivity and high selectivity, is simple and convenient to operate and good in stability, can effectively detect the content of Co < 2 + > ions in waste liquid in the printing production process, and provides a new solution for environmental monitoring.

The invention discloses a pyrazole derivative and a preparation method and application thereof, and the method comprises the following steps: S1, dissolving reactants in a reaction solution according to a ratio, and then carrying out a heating reflux reaction in an N2 atmosphere; s2, performing extraction, drying and chromatography to obtain a solid product a; s3, adding the solid product a in the S2 into a mixed solvent of methanol and dichloromethane, adding HCl into the mixed solvent to remove a protecting group, then adjusting the pH value of the mixed solvent to 7, and filtering to obtain a solid product b; s4, methanol is added into the solid product b obtained in S3 for recrystallization, and the pyrazole derivative is obtained through filtering and vacuum drying. According to the pyrazole derivative and the preparation method and application thereof, the problems that in the prior art, a monodentate ligand is single in coordination site and simple in coordination form, and an obtained complex is single in structure and function are solved, and multifunctional ligands bringing rich coordination sites are provided.

The invention discloses an immobilized enzyme material, a preparation method and application of the immobilized enzyme material in phospholipid DHA synthesis. The immobilized enzyme material is composed of a magnetic MnFe2O4 nanometer core and an outer layer Ni3 (BTC) 2 metal organic framework, phospholipase A1 is loaded on a porous structure and a metal coordination site of Ni3 (BTC) 2, and the magnetically separable immobilized enzyme composite material is formed. The phospholipase A1 is efficiently immobilized through physical adsorption and metal coordination, the obtained immobilized enzyme material shows remarkable catalytic performance in a non-aqueous system, and compared with free enzyme, the apparent Km of the immobilized enzyme is reduced, the Vmax is increased, and the substrate affinity and the catalytic efficiency are remarkably improved. The material can be subjected to rapid magnetic separation and still keeps the relative activity exceeding 57.7% after being repeatedly used for five times, and the DHA doping rate of the immobilized enzyme can reach 54.37% in the directional acylation reaction of phospholipid DHA.

The present invention discloses a porphyrin-based COF and aerogel based on a double-bridged monomer, as well as a preparation method and application, belonging to the field of advanced functional materials. The present invention utilizes two bridging monomers, 2,4,6-triformylphloroglucinol (Tp) and 2,6-pyridinedicarboxaldehyde (PDA), to prepare Tp-PDA-COF based on porphyrin-based COFs. The electron-withdrawing group in Tp optimizes the orbital energy levels of the metal ligands, promoting electron transfer and the formation of coordination bonds. PDA enables the COF to exist in a tetragonal topology, thereby reducing steric hindrance and exposing coordination sites, improving the selectivity and sensitivity for metal ions and enabling rapid and sensitive visual fluorescence detection. Furthermore, Tp-PDA-COF aerogel is prepared in combination with polyvinyl alcohol to address the problem of fluorescence quenching of porphyrin-based COFs in the solid state, thereby achieving the goal of developing COFs materials with both sensitive detection and efficient adsorption.

The present invention relates to the technical field of molecular-based magnetic materials. In order to solve the problem that the synthesis of existing asymmetric lattice-type spin-crossover materials is difficult and it is difficult to achieve an asymmetric arrangement of coordination sites by synthesizing symmetrical multidentate ligands, a lattice-type iron-based complex based on cis-trans isomerized triazoles and a preparation method thereof are proposed. The spin-crossover material prepared by the present invention is based on a bidentate triazole ligand, and a lattice-type spin-crossover material is prepared by self-assembly of the ligand and transition metal ions; by adjusting the terminal substituent, the orientation of the ligand can be well adjusted to achieve the assembly of an asymmetric lattice-type spin-crossover material. The experimental operation of the present invention to prepare a bidentate triazole ligand by condensing a cyano compound with a hydrazide and then dehydrating it is simple, the yield is as high as more than 85%, and it is easy to promote and apply on a large scale.

A composition of matter for selective binding of at least one heavy metal comprising at least one porous metal-organic framework (MOF) with unsaturated coordination sites, at least one organic ligand functionalized with at least one functional group tailored to bind to the at least one MOF, and at least one separate functional group tailored to bind to the at least one heavy metal.