35 results about "Coordination site" patented technology

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 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 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 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 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 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.

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.

The invention belongs to the field of inorganic and organic material design and catalysts, and discloses a method for preparing a high-defect metal organic framework material from a green, non-corrosive, low-equivalent and multi-site modulating agent and application of the high-defect metal organic framework material. The invention provides a novel strategy of using a multi-site modulator, breaks through the traditional regulation dimension, and can realize effective competitive coordination with an original ligand under low equivalent weight by regulating the number and relative positions of coordination sites on the modulator, thereby realizing high-density defect introduction. The strategy breaks through a regulation and control mode that traditional modulation only depends on parameters such as the dosage and acidity of the modulation agent, and a brand new regulation and control dimension is provided for design of the modulation agent. Strong acid or high temperature conditions are not needed, the process is simple and convenient to operate, green, economical and easy to scale up, the synthesized high-defect metal organic framework material shows excellent performance in the fields of acid catalysis and the like due to the fact that a large number of open metal sites are exposed, and the practical application value of the high-defect metal organic framework material is remarkably expanded.

The present application relates to the technical field of lanthanide recovery, and particularly relates to a triethylammonium chloride crystal, preparation thereof and application thereof in lanthanide recovery. The triethylammonium chloride crystal is composed of triethylammonium cation and chloride ion, and has a chemical formula of NEt3HCl. Each nitrogen atom is bonded with three ethyl groups to form a typical triethylammonium cation, and the chloride ion occupies a lattice position and participates in N-H...Cl hydrogen bond interaction. In the triethylammonium chloride crystal, the content of chlorine is 44.22%, the content of carbon is 35.80%, the content of hydrogen is 9.99%, and the content of nitrogen is 9.99%. In the triethylammonium chloride crystal, the nitrogen element serves as a coordination site and can directly coordinate with lanthanide ions. Due to the influence of the hydrophobic effect of the ethyl group in triethylamine, lanthanum 98.30%, europium 98.70% and lutetium 98.79% can be efficiently adsorbed and recovered. It is shown that the triethylammonium chloride crystal has good adsorption performance on lanthanide elements and can realize high-capacity adsorption enrichment of lanthanide elements.

This invention discloses a chiral phenol bis(nitrile) ligand Bf-2NO and an intermediate Bf. The invention involves a condensation reaction between various substituted proline amides or hydroxyproline 1 and phenol-2,5-dicarboxaldehyde 2 to generate intermediate Bf. Then, the nitrogen atom in intermediate Bf undergoes a nitrogenooxidation reaction under the action of the oxidant m-chloroperoxybenzoic acid to generate the chiral phenol bis(nitrile) ligand Bf-2NO. This type of ligand contains a phenolic group and a nitrile group (the hydroxyl oxygen atom of phenol and the oxygen atom of the nitrile group are electron-rich coordination sites). It can form a seven-membered ring coordination with Lewis metals, thereby generating a chiral ligand-metal complex, which can be used as a chiral ligand in asymmetric catalytic reactions. This invention is simple and easy to operate, the raw materials are inexpensive and readily available, the ligand prepared by this invention can react in various organic solvents, has good air stability, wide applicability, and good compatibility with various substituents.

According to the invention, hydrogen-substituted graphdiyne (HsGDY) is used as a carrier of polyphthalocyanine iron (FePPc) molecules, ordered double acetylenic bonds of the hydrogen-substituted graphdiyne (HsGDY) are used as coordination sites, and the polymerization degree of FePPc growing along a HsGDY two-dimensional plane is controlled through d-pi interaction with Fe-N4 sites, so that the interlayer stacking behavior of the HsGDY is inhibited; therefore, the hydrogen-substituted graphdiyne-loaded small-size polyphthalocyanine iron (HsGDY and FePPc) composite nano array electrode with a high exposure degree and a stable electrochemical interface is formed. Key points are that the HsGDY can promote enrichment and conversion of nitrate radicals and electrons on an interface of the HsGDY and FePPc; the double acetylenic bond can be used as an active site for catalytic conversion of NO3 <-> to NO2 <->, and the conversion of NO2 <-> from a polyphthalocyanine iron Fe-N4 site to NH2OH is promoted; the double acetylenic bonds interact with d-pi of the Fe-N4 site, so that the adsorption energy of NH2OH at the Fe-N4 site can be reduced, the desorption of NH2OH is promoted, and the HsGDY-coated FePPc composite molecular catalyst with series catalytic action is obtained.

This invention discloses a method for preparing a Zr-MOF catalyst containing a Co single-atom site, belonging to the field of metal-organic framework synthesis and advanced oxidation catalysis technology. First, mesoporous Zr-MOFs (NKM-508) are prepared via a solvothermal method using H4TCPB-CH3 ligand and ZrCl4. Based on NKM-508, N,O coordination sites are constructed through aspartic acid amino modification and salicylaldehyde Schiff base reaction, ultimately anchoring a Co single atom to obtain the NKM-508-Co catalyst. This catalyst exhibits good stability, can efficiently activate potassium persulfate (PMS) to generate reactive oxygen species, can rapidly degrade various azo dyes such as eosin Y, orange G, methylene blue, and rhodamine B, and demonstrates excellent recyclability.

The invention discloses a heteronuclear supramolecular coordination assembly and a preparation method and application thereof, and belongs to the technical field of synthesis of supramolecular metal organic complexes. Compared with an existing supramolecular coordination structure, the heteronuclear supramolecular coordination assembly has the advantages that the solvent condition is improved, and the heteronuclear supramolecular coordination assembly can be synthesized in a water solution under mild reaction conditions; the use of toxic and high-boiling-point organic solvents is avoided, the reaction post-treatment is convenient, and the green chemical development strategy is met. A flexible heteronuclear supramolecular coordination assembly with adaptive deformation characteristics is prepared by using a multi-coordination-site flexible ligand, and the application range of a rigid cavity structure is expanded. The heteronuclear supramolecular coordination assembly contains a metal active center, can be directly used as a nano-catalyst, and overcomes the defect that metal ions in most coordination structures lose activity due to coordination saturation. The structure can chelate active centers with different properties on the premise of keeping a skeleton stable and unchanged, and is beneficial to research on a mimic enzyme catalysis universality rule.

The invention discloses a reverse stacking TF-PA-COOH COF material and a preparation method and application thereof.The preparation method of the reverse stacking TF-PA-COOH COF material comprises the following steps that an aldehyde monomer, an amino monomer and an organic solvent are added into a reaction tube, and ultrasonic treatment is conducted to obtain a mixture; and adding a catalyst into the mixture, freezing in liquid nitrogen, vacuumizing and filling nitrogen into the tube for three times, sealing the tube with flame, cooling to 20-25 DEG C, heating and crystallizing, collecting a solid, and washing, filtering and vacuum-drying the solid to obtain the reverse stacked TF-PA-COOH COF material. Monomer carboxyl functional groups are reversely stacked on adjacent layers, hydrogen bond interaction cavities with the interlayer spacing of 7.2 are constructed, meanwhile, a large number of Lewis alkaline active chemical coordination sites (imine bonds C = N and carboxyl COOH) exist in the layers, and the saturation adsorption capacity of the material to thorium reaches up to 2495 mg g <-1 >.

The invention discloses a large-steric-hindrance triazole carbene monodentate palladium compound containing surplus N and N chelating ligands as well as a preparation method and application of the large-steric-hindrance triazole carbene monodentate palladium compound, and the structural formula of the large-steric-hindrance triazole carbene monodentate palladium compound is shown as a formula I. The preparation method comprises the following steps: (1) adding a compound S and a compound Ar into an organic solvent, reacting at 80-120 DEG C for 12-24 hours, and purifying to obtain large-steric-hindrance triazole salt L containing the surplus N and N chelating ligands; and (2) adding L, palladium salt and alkali into an organic solvent, stirring for 6-12 hours at 50-90 DEG C, and purifying and drying to obtain a target product. Compared with a traditional carbene palladium compound, the large-steric-hindrance triazole carbene monodentate palladium compound containing the surplus N and N chelating ligands has the high electron donating capacity, an N-heterocyclic carbene framework contains a pair of surplus coordination sites, the N-heterocyclic carbene monodentate palladium compound can be stably combined with a palladium center, meanwhile, coordination with metal copper can still be achieved through the surplus coordination sites, and therefore the large-steric-hindrance triazole carbene monodentate palladium compound containing the surplus N and N chelating ligands is obtained. Therefore, the C-H bond arylation reaction of the oxazole derivative is efficiently and synergistically catalyzed by the bimetal.

The application discloses a reverse stacking TF-PA-COOH COF material and a preparation method and application thereof. The preparation method of the reverse stacking TF-PA-COOH COF material comprises the following steps: adding an aldehyde group monomer, an amino monomer and an organic solvent into a reaction tube, and ultrasonic treatment to obtain a mixture; then adding a catalyst into the mixture, freezing in liquid nitrogen, vacuumizing the tube and filling nitrogen repeatedly for three times, flame sealing the tube, cooling to 20-25 DEG C, and then heating and crystallizing, collecting the solid, washing, suction filtering and vacuum drying, so that the reverse stacking TF-PA-COOH COF material is obtained. The monomer carboxyl functional group is reversely stacked in adjacent layers to construct a hydrogen bond interaction cavity with a spacing of 7.2 angstroms between layers, and a large number of Lewis basic active chemical coordination sites (imine bond C=N and carboxyl COOH) are present in the layer, and the saturation adsorption amount of the material to thorium is as high as 2495mg g ‑1 .

The application discloses a chiral pyrroloimidazolone-xanthene-triphenylphosphine ligand. The application generates a target product chiral pyrroloimidazolone-xanthene-triphenylphosphine ligand through condensation reaction of corresponding prolyl arylamine 1 and triphenylphosphine xanthene formaldehyde 2. The ligand comprises a triphenylphosphine group, a xanthene group and a chiral pyrroloimidazolone group. The chiral pyrroloimidazolone group can provide a chiral cavity environment, the xanthene group can provide a rigid skeleton, and the phosphorus atom of the triphenylphosphine group belongs to an electron-rich coordination site, can form coordination with metal, thereby generating a chiral ligand metal phosphine complex, and the application in catalyzing asymmetric allyl alkylation of alcohol. Therefore, the ligand has important application value in the field of asymmetric catalytic synthesis, and the synthesis method is very economical and simple. The ligand also has good air stability, wide applicability and good compatibility for various substituents.

This invention relates to the field of fluorine pollutant removal technology, specifically to a fluorine-acetylene bifunctionalized covalent organic framework material, its preparation method, and its applications. It has the following structural units. Using 4,4',4''-(benzene-1,3,5-triyltris(acetylene-2,1-diyl))tribenzaldehyde and 1,3,5-tris(4-amino-2,3,5,6-tetrafluorophenyl)benzene as raw materials and trifluoroacetic acid as a catalyst, a Schiff base condensation reaction is carried out in a solvent reaction system to obtain the fluorine-acetylene bifunctionalized covalent organic framework material. By constructing a two-site COF material using acetylene and fluorine atoms, the introduction of fluorine atoms into the COF can enhance the affinity for PFAS through F-F interactions or strongly electronegative sites; the introduction of acetylene groups provides a rich π-electron system and potential metal coordination sites, which helps stabilize the framework structure and introduce secondary interactions, enabling efficient enrichment and electrochemical conversion of PFAS.

The application discloses an ion cage connected covalent organic framework compound and a preparation method and application thereof. The preparation method comprises the following steps: mixing an iron source, an oxime base derivative, a boric acid base derivative, a first solvent and a second solvent, and performing a liquid nitrogen freezing-pump air extraction-freezing cycle degassing treatment, then sealing and performing a condensation reaction to prepare a metal chelate connected covalent organic framework compound; and performing acid treatment on the metal chelate connected covalent organic framework compound to prepare the ion cage connected covalent organic framework compound. The preparation method provided by the application has the advantages of easy raw material, mild conditions, simple operation, and the like, and the prepared covalent organic framework compound has a clear cavity structure and a periodic arrangement of coordination sites, exhibits excellent chemical stability and regular channel characteristics, and has a wide application prospect in the fields of ion adsorption separation, heterogeneous catalysis and the like.

The invention relates to the technical field of catalysts, and discloses a palladium / aluminum oxide catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, synthesizing a Schiff base phosphorylation cyclodextrin ligand through two-step reaction of nucleophilic substitution and Schiff base condensation; according to the molecular structure, a hydrophobic cavity of beta-cyclodextrin and a strong coordination site of diphenylphosphine are covalently bridged through a rigid Schiff base bond; then, the phosphine group of the ligand is coordinated with palladium salt at a specific pH value, and a uniform and stable palladium-ligand colloid precursor is formed under the assistance of a guiding agent and a stabilizing agent; and finally, mixing, dipping and drying the colloid and an aluminum oxide carrier to obtain the palladium / aluminum oxide catalyst. Through molecular design and process innovation, the problems that a traditional catalyst is low in activity, poor in selectivity and insufficient in stability are solved. When the catalyst is used for preparing hydrogen peroxide through anthraquinone hydrogenation, the hydrogenation efficiency is remarkably improved, the selectivity is extremely high, the cycling stability is excellent, and the catalyst has important industrial application value.

The application discloses a zinc ion fluorescent probe compound and a preparation method and application thereof, and relates to the technical field of fluorescent probes.The application forms a reversible fluorescent probe for detecting zinc ions by reasonably designing a probe molecular structure, taking 2-(phenylimino)methyl)phenol as a skeleton, and introducing coordination sites capable of being combined with zinc ions.From the perspective of Lewis acid-base theory, zinc ions are electron-deficient Lewis acids, are easy to be coordinated with heteroatoms such as N and O to form Lewis acid-base pairs, form a complex, and can realize accurate detection of zinc ions.Meanwhile, the complex fluorescent probe has reusability and high anti-interference property, the photophysical property of the probe can be recovered through a decomplexing agent after fluorescent recognition, the fluorescent detection can be realized again, the effect of reversible recognition is achieved, the use cost of the probe is reduced, and the pollution to the environment is reduced.

The invention discloses a preparation method and application of a metal polyphenol-based nano enzyme with multi-enzyme activity. The metal polyphenol-based nano enzyme with multi-enzyme activity is prepared by using a compound rich in phenolic hydroxyl groups as a ligand through a coordination self-assembly reaction, and multifunctional integrated application is realized. Phenolic hydroxyl groups in the compounds contribute to the formation of interaction of hydrogen bonds and pi-pi accumulation, can stabilize the self-assembly process of a two-dimensional structure, and can enhance the affinity of the nano-enzyme to a catalytic substrate through ligand engineering action. Meanwhile, the phenolic hydroxyl group is used as a strong coordination site and forms a stable coordination bond with metal ions, the specific coordination mode regulates and controls the electron cloud density and valence state of a metal center, an electrophilic or nucleophilic microenvironment beneficial to substrate combination is created, and therefore the nano enzyme is endowed with various enzyme sample activities. The metal polyphenol-based nano enzyme can be widely applied to the fields of detection of related substances in foods, medicines and environments, removal of pollutants and diagnosis and treatment of diseases.

This invention relates to the field of multifunctional new materials technology, particularly to a butterfly-shaped trinuclear Schiff base rare earth metal catalyst, its preparation method, and its application. The molecular structure of this catalyst is as follows: where M1 to M3 are rare earth metal ions. These rare earth metal ions possess high Lewis acidity and oxyphilicity, promoting the activation of epoxides and achieving acid-base synergistic catalysis to advance the reaction. The ligand not only readily coordinates with rare earth metal ions, but the -C=N- group in the ligand also exhibits Lewis basicity, facilitating the fixation of carbon dioxide in the target substrate. The addition of hydroxyl groups, in synergy with the -C=N- group, enriches the coordination sites, thereby constructing a unique energy level structure that maintains structural stability even at high temperatures. During catalysis, the reaction is unaffected by additional moisture and air, resulting in low catalytic cost, high catalytic efficiency, and high conversion rate. This invention solves the problems of harsh catalytic conditions, low catalytic efficiency, and low conversion rate associated with existing tetradentate pyridyl Schiff base metal complexes as catalysts.