46 results about "Mixed ligand" patented technology

The invention relates to a preparation method of a terephthalic acid and 2-methylimidazole organic framework catalyst, and relates to a preparation method of a high polymer material catalyst, the preparation method comprises the following steps: weighing C6H4 (COOH) 2 and 2-methylimidazole, dissolving C6H4 (COOH) 2 and C4H6N2 in N, N-dimethylformamide (DMF), weighing zinc nitrate hexahydrate (Zn (NO3) 2.6 H2O), dissolving in DMF, and preparing into a solution; the preparation method comprises the following steps: mixing a C6H4 (COOH) 2 solution and a C4H6N2 solution in proportion, and uniformly stirring; slowly adding the mixed ligand solution into a mixed solution of zinc nitrate hexahydrate (Zn (NO). 6HO) dissolved in DMF (Dimethyl Formamide), and transferring into a high-pressure reaction kettle for reaction; after cooling, centrifugally separating to obtain a white solid product, washing with methanol, and drying to obtain the Zn-MOF catalyst. The Zn-MOF catalyst provided by the invention can be widely applied to polyester synthesis, esterification reaction and other organic catalytic reactions, and especially has significant advantages in PBAT synthesis.

The invention belongs to the technical field of metal organic framework materials, and particularly relates to a copper-based mixed ligand metal organic framework material and a preparation method and application thereof. According to the copper-based mixed ligand metal organic framework material provided by the invention, Cu < 2 + > is used as coordination metal, 2, 2 '-bipyridine-5, 5'-dicarboxylic acid and 1, 2, 4-triazole are used as organic ligands, and the copper-based mixed ligand metal organic framework material is of a three-dimensional network structure with a P21 / c space group. The structure of the copper-based mixed ligand metal organic framework material has coordinated water molecules facing the inside of a pore channel, and a large number of open metal sites can be exposed after activation, so that the material has a relatively high specific surface area, and gas molecules such as carbon dioxide and the like can be polarized; the interaction between the material and gases such as carbon dioxide is improved, so that the adsorption capacity and separation selectivity of the gases such as carbon dioxide are improved.

The invention discloses a sensing base material for driving ordered distribution of dioxin in a spatial confinement range and a preparation method thereof. The preparation method comprises the following steps: preparing an MOF matrix based on a binary mixed ligand, directionally regulating and controlling a vertical pore channel, hydrophobically modifying-CF3, and regulating and controlling competitive coordination doping. The invention provides a triple strategy of'mixed ligand + post-modification + defect control 'based on a synergistic effect of'gradient modification + vertical confinement'. Through the strategy, the performance is obviously improved in the adsorption application of a typical dioxin compound 2, 3, 7, 8-TCDD. Meanwhile, the material prepared by the invention can effectively drive ordered distribution of 2, 3, 7, 8-TCDD in a vertical pore channel, and provides a key basic material for stable SERS (Surface Enhanced Raman Scattering) sensing analysis.

The invention relates to the technical field of blood purification materials, in particular to a zirconium-titanium bimetal MOF hollow microsphere adsorbent and a preparation method and application thereof. The adsorbent is based on a Zr / Ti bimetallic node and a phosphonic acid-carboxylic acid mixed ligand, a composite MOF hollow microsphere structure with high stability and high specific surface area is constructed through a solvothermal and polymerization synergistic reaction in a water-in-oil suspension system, a phosphonic acid group and Zr are strongly coordinated to improve the stability of a framework, and the composite MOF hollow microsphere structure has a high specific surface area. The carboxylic acid group keeps the hydrophilicity of the pore channel; meanwhile, a cross-linked network of acrylamide and N, N '-methylene bisacrylamide penetrates through crystal gaps in the balling process, so that the material has excellent mechanical strength and fluid stability; and a sulphobetaine amphoteric polymer brush layer is constructed on the surface of the MOF through endogenous initiation point modification and surface in-situ controllable free radical polymerization technologies, so that protein adsorption and platelet adhesion are effectively inhibited, the blood compatibility is remarkably improved, and meanwhile, the channel accessibility is maintained to promote rapid diffusion and adsorption of bilirubin.

A layered semiconductor device includes a mixed ligand compound comprising: a cyclophosphazene core moiety, a first ligand moiety, and a second ligand moiety. The first ligand moiety and the second ligand moiety are each bonded to the core moiety. A composition comprising a plurality of compounds, each of the plurality of compounds comprising a cyclophosphazene core moiety and at least one ligand moiety bonded to the cyclophosphazene core moiety; the plurality of compounds comprise at least one common ligand moiety.

The invention provides a catalyst for adjusting the normal / isomeric ratio of a butyraldehyde product and an adjusting method of the catalyst. The catalyst comprises a ligand A, a ligand B and a rhodium substrate, wherein the ligand A is one or more of # imgabs 0 #, # imgabs 1 #, # imgabs 2 # or # imgabs 3 #; and the ligand B is # imgabs4 #. The invention provides a catalyst for adjusting the normal / isomer ratio of a formaldehyde product in the process of preparing butyraldehyde through a propylene hydroformylation reaction, and the catalyst has propylene hydroformylation catalytic activity after complexing a ligand A, a ligand B and a rhodium substrate based on an accurately designed ligand combination. A mixed ligand composed of a ligand A and a ligand B according to a certain proportion is added in a propylene hydroformylation reaction to be complexed with rhodium, so that the n-iso-ratio of butyraldehyde can be flexibly adjusted in a range of 1-17.3.

The invention provides a patterning composition, a compound, a patterning method, an electronic device and application. The patterning composition includes a compound represented by the following formula: (RaM) b (L1) x (L2) y (L3) z. The patterning composition comprises the metal organic compound coordinated by the specific mixed ligand, so that in the patterning process, the structure can obviously improve the hydrolytic stability of the patterning composition during the patterning process, and the exposure dose is reduced.

The invention discloses a hierarchical pore UiO-66 supported crown ether composite material, a preparation method thereof and application of the hierarchical pore UiO-66 supported crown ether composite material in adsorption and extraction of 6Li < + > from complex systems such as salt lake brine. The preparation method comprises the following steps: preparing terephthalic acid, 2-aminoterephthalic acid and a zirconium source through a solvothermal method to obtain a mixed ligand UiO-66, and then pyrolyzing the mixed ligand UiO-66 in an air atmosphere to obtain the hierarchical pore UiO-66; the hierarchical pore UiO-66 and a crown ether solution are mixed and stirred to react for a period of time, then solid-liquid separation is carried out, solids are collected, and the hierarchical pore UiO-66 loaded crown ether composite material is obtained after cleaning and drying. The hierarchical pore UiO-66 loaded crown ether composite material has the advantages of high specific surface area, high dispersion of crown ether adsorption sites, high crown ether loading capacity, high selectivity of 6Li < + > metal ions and the like, and can realize one-step enrichment of 6Li < + > metal ions in complex systems such as salt lake brine.

The present invention provides a metal-ligand protected silver nanocluster and its preparation and application in remote laser ignition. The metal-ligand protected silver nanocluster of the present invention is composed of RS ‑ and [(TC4A)6(V9O 16 )] 11‑ binary mixed ligand protected Ag 14 nanoclusters, with the molecular formula {Ag 14 [(TC4A)6(V9O 16 )](RS)3}. The structure and composition of the silver nanoclusters synthesized by the present invention are clear and novel; the preparation steps are simple, the preparation conditions are mild, and the raw materials are easily available, having the potential for industrial production; the obtained silver nanoclusters have excellent photothermal conversion performance, have good photothermal conversion effect and rapid heating rate under the irradiation of 660 nm laser, and have potential application value in the field of laser remote ignition materials.

The invention discloses a mixed ligand modified cesium lead halide perovskite nanocrystal and a preparation method thereof, and the preparation method comprises the following steps: (1) adding CsBr and PbBr2 in an equal molar ratio into a P-AMDL polymer solution to obtain a CsPbBr3 precursor solution; (2) injecting the precursor solution into a toluene solvent, and then settling and purifying by using an n-hexane solvent to obtain a P-AMDL modified CsPbBr3 solution; (3) introducing an oleic acid oleylamine ligand to obtain CsPbBr3 modified by a mixed ligand; and (4) optimizing an ion exchange method by combining a mixed ligand strategy to obtain the mixed ligand modified CsPbBrxI3-x. According to the invention, the problem of wide particle size distribution of nanocrystals synthesized by an LARP method at room temperature is solved, and the all-inorganic cesium-lead halide perovskite nanocrystals with fewer defects, more regular morphology and better ultraviolet stability are successfully prepared. The'micromolecule + polymer 'mixed ligand strategy gives consideration to the regulation and control precision of the micromolecule ligand and the stability of the polymer ligand, and is an effective means for optimizing the morphology and performance of the perovskite nanocrystal.

The invention belongs to the technical field of preparation of catalytic materials, and provides a high-density defective polyacid-based metal organic framework catalyst for hydroboration, a preparation method and application. According to the catalyst, a metal organic framework with defects is constructed by adopting a mixed ligand strategy, a polyacid cluster is introduced in situ on the basis of the metal organic framework, and through weak interaction between a cluster object and a subject framework, regulation and control of an oxidation state of a metal node and regulation and control of a supporting effect of an expanded pore space are realized at the same time; therefore, the problem of unstable structure caused by high defect content is overcome, the polyacid-based metal organic framework catalyst with high-density defects is successfully constructed, the catalyst solves the problems that the existing hydroboration reaction is high in temperature, the catalyst is difficult to recycle and the like, efficient conversion of the alkyne hydroboration reaction can be realized, and the yield of the alkyne hydroboration reaction is increased. Moreover, the structure is still stable after repeated cyclic utilization and use, and can be expanded to various alkyne substrates.

The invention relates to a mixed ligand MOFs material and a preparation method and application thereof, and the preparation method comprises the following steps: weighing H2PZDC, sequentially adding NaOH and hydroxy aluminum, mixing, carrying out a primary water bath reaction, rapidly adding FA, and carrying out a secondary water bath reaction; and centrifuging the product, washing, precipitating, drying and grinding to obtain the mixed ligand MOFs material. Compared with a traditional single-step synthesis method, the method has the advantages that controllable coordination of metal nodes and double organic ligands is realized through a staged ligand introduction strategy, the proportion of the double ligands in the material can be accurately regulated and controlled, and the material has an adjustable water adsorption working interval. Compared with a single-ligand MOF material, the mixed-ligand MOF material prepared by the method disclosed by the invention has the advantages that the water adsorption performance is enhanced (under the environment humidity), and the cost can be reduced by about 40%. The material shows remarkable application advantages in the fields of air humidity regulation, industrial drying systems, moisture prevention of precise instruments and the like.

The present disclosure includes the preparation of mixed-ligand compounds, such as tin(II) cyclopentadienylide complexes. The compounds of the present disclosure can be used as atomic layer deposition (ALD) precursors for extreme ultraviolet (EUV) lithography. The compounds of the present disclosure can also be used as plasma chemical vapor deposition (CVD) precursors for EUV lithography.

The invention relates to the technical field of preparation of monomolecular magnets, and particularly discloses a preparation method of a high-symmetry dysprosium-based monomolecular magnet, which comprises the following steps: pretreating dysprosium nitrate hexahydrate, 1, 3, 5-benzene tricarboxylic acid, 4, 4 '-dipyridyl, N, N-dimethylformamide and methanol for later use, respectively adding the 1, 3, 5-benzene tricarboxylic acid and the 4, 4'-dipyridyl into the N, N-dimethylformamide, and reacting for 2-4 hours to obtain a dysprosium-based monomolecular magnet with high symmetry. Dissolving in N, N-dimethylformamide, and mixing to prepare a mixed ligand solution; and dissolving the dysprosium nitrate hexahydrate in methanol, dropwise adding the solution into the mixed ligand solution, and carrying out hydrothermal reaction to obtain the high-symmetry dysprosium-based single-molecular magnet. 1, 3, 5-benzene tricarboxylic acid with a symmetrical benzene ring structure and rare earth metal dysprosium ions form a symmetrical coordination structure, meanwhile, a symmetrical coordination environment can be further constructed around the metal ions through a linear symmetrical structure of 4, 4 '-dipyridyl, the symmetry of the complex is greatly improved, the magnetic anisotropy of the complex is higher due to the high symmetry, and the rare earth metal dysprosium complex can be used for preparing a rare earth metal dysprosium complex. And the quantum tunneling effect is weaker.

Provided herein are mixed ligand metal organic framework (ML-MOF) materials having rectangular grids characterized by the general formula MaMbF6-n(O / H2O)n(Ligand′)x(Ligand″)y(solvent)z, which are effective for capture of carbon dioxide from a fluid composition.

The present invention relates to a WO 3‑x The present invention successfully prepared a 3D printed self-supporting membrane with rich W by precisely controlling the solvent thermal reaction conditions and the innovative OA / OLA mixed ligand system. 5+ Active sites and ordered oxygen vacancy defects in WO 3‑x Nanomaterials. This invention innovatively utilizes direct writing (DIW) 3D printing technology to successfully construct a three-dimensional self-supporting membrane. This not only provides an efficient, stable, and economical solution for the treatment of antibiotic contamination in aquatic environments, but also opens up new avenues for the design and manufacture of novel functional materials. Its comprehensive performance indicators and application potential significantly surpass existing technologies, enabling industrial application. Furthermore, this technology can be applied in sewage treatment, medical wastewater treatment, and other fields, benefiting environmental protection and public health.

The invention discloses a hydrated eutectic electrolyte and a preparation method and application thereof, and belongs to the technical field of batteries. The invention provides a mixed ligand hydration eutectic electrolyte strategy based on thermodynamic-dynamic balance. According to the strategy, through functional synergy of acetamide (Ace) and 1, 3-dioxolane (Dol), integrated regulation and control of an electrolyte liquid phase microenvironment and interface chemistry are achieved, so that side reactions are remarkably inhibited, and the electrochemical performance is comprehensively improved.

The invention relates to the technical field of nanometer material synthesis and catalysis, in particular to a gold nanocluster and a preparation method thereof, a catalyst and a preparation method and application of the catalyst. The molecular formula of the gold nanocluster is Au40 (TBBT) 24 (TPMP); wherein the TBBT is 4-tert-butyl thiophenol, and the TPMP is tri (m-phenyl) phosphine. According to the present invention, the gold nano-particles have the accurate number of atoms and the determined molecular structure, the synergistic effect of the mixed ligands (mercaptan and phosphine) on the surface of the gold atomic nucleus further regulates the electronic structure and the surface property of the cluster, and the adsorption and activation ability of the substrate molecule is optimized so as to improve the catalytic efficiency and the stability; especially for reduction reactions such as reduction of 4-nitrophenol, the cluster can realize efficient catalytic conversion under mild conditions.

The invention belongs to the technical field of catalyst preparation, and relates to a method for rapidly and macroscopically preparing an iron-loaded porous molecular organic framework catalyst, which comprises the following steps: by taking 2, 2 '-bipyridine-5, 5'-dicarboxylic acid Bpydc and 4, 4 '-stilbene dicarboxylic acid SBDC as mixed ligands, Al (NO3) 3.9 H2O as a metal source and N, N-dimethylformamide DMF as a solvent, completing a reaction within 1 min by adopting an ultra-rapid solvothermal method, thereby obtaining the iron-loaded porous molecular organic framework catalyst. A gram-level MOF precursor MOF-1 is obtained; dispersing the obtained MOF carrier in an acetonitrile solution to form an MOF dispersion liquid, then adding FeCl3. 6H2O, and anchoring Fe species in pores or surfaces of MOF-1 through an impregnation method; and carrying out vacuum drying treatment on the loaded material for 12 hours to obtain the catalyst. According to the method, the time limitation of a traditional solvothermal method is broken through, the MOF synthesis time is shortened from day to minute, rapid preparation is realized, and the preparation efficiency is high. According to the method disclosed by the invention, complex high-voltage equipment is not needed, the process is simple, amplification is easy, the gram-level high-quality MOF carrier can be prepared at one time, macro preparation is realized, and the mass production capacity is outstanding.

The invention discloses a defect-state Zr-La bimetal MOF adsorbent as well as a preparation method and application thereof, and relates to the technical field of water treatment and adsorption materials. Comprising the following steps: mixing zirconium salt, lanthanum salt, a solvent and an organic ligand, fully stirring and dissolving, carrying out hydrothermal reaction, centrifugally washing, drying, and collecting to obtain the defect-state Zr-La bimetal MOF adsorption material, the organic ligand is selected from 1, 3, 5-benzenetricarboxylic acid or a mixture obtained by replacing 1, 3, 5-benzenetricarboxylic acid with a hybrid organic ligand in a set proportion, and the hybrid organic ligand is selected from any one of terephthalic acid, isophthalic acid, phthalic acid, p-hydroxybenzoic acid, pyridine-3, 5-dicarboxylic acid and 2-aminoterephthalic acid. According to the defect-state Zr-La bimetal MOF adsorbent provided by the invention, accurate control on a material defect structure is realized through methods such as ligand mixing, reaction condition regulation and control and post-synthesis modification, controllable defects are introduced into a frame structure, the porosity is improved, and additional active sites are generated, so that the fluorine adsorption performance is remarkably improved.

The present invention provides a method for one-step synthesis of adiponitrile. In the method, starting materials butadiene and hydrogen cyanide directly react under the action of a rare earth metal-mixed ligand catalyst and an auxiliary agent to produce adiponitrile, wherein the rare earth metal-mixed ligand catalyst comprises a rare earth metal, a monodentate phosphite ligand, and a multidentate phosphite ligand. According to the present invention, by using the rare earth metal as a catalyst, together with the monodentate phosphite ligand and the multidentate phosphite ligand, the rare earth metal-mixed ligand catalyst with high catalytic performance and high stability is formed, which, in combination with the auxiliary agent, efficiently catalyzes the simultaneous reaction of butadiene with two molecules of hydrogen cyanide to directly obtain adiponitrile. The method greatly simplifies the process flow of producing adiponitrile by using butadiene and hydrogen cyanide as starting materials, and features a high starting material conversion rate, high adiponitrile selectivity, and low operating costs, thus being suitable for large-scale industrial production.

The invention belongs to the technical field of precise chemical synthesis of nano-molecules, and particularly relates to an atomic structure precise type light-emitting Cu11 nano-cluster which can be simply, conveniently and rapidly prepared in a macroscopic quantity and a preparation method of the atomic structure precise type light-emitting Cu11 nano-cluster. The invention provides Cu11 (I) co-protected by cyclohexanethiol and a bis (diphenylphosphine) methane ligand. The three types of Cu11 provided by the invention are Cu clusters co-protected by mixed ligands, and comprise 11 Cu atoms, 9 cyclohexanethiol ligands and 3 bidentate phosphorus ligands, and two NO3 <-> anions are arranged on the periphery of the Cu clusters; the precise structure of the Cu11 is composed of a double-pyramid Cu5 unit similar to a double-triangular pyramid and three Cu2S3P2 elements. Compared with a reported luminescent Cu nanocluster synthesis method, the synthetic method disclosed by the invention has the advantages of simplicity, convenience, quickness, high yield, easiness in crystallization, high universality and the like; and the luminous intensity and the emission center of the Cu11 cluster can be effectively regulated and controlled based on the method.

The invention discloses a method for realizing controllable synthesis of polyhedral cuprous oxide based on sound wave temperature control, which comprises the following steps: (1) preparation of a mixed solvent, (2) preparation of a temperature control environment, (3) preparation of a mixed ligand complex precursor, (4) sound wave reaction, and (5) washing and drying of a material. A mixed ligand complex system formed by common coordination of acetate, ethylene glycol molecules and water molecules slowly releases Cu < 2 + >, and the anisotropic growth rate of the crystal can be controlled to induce huge development of the morphology of pure-phase cuprous oxide through differential extreme temperature differences between local high temperature and different temperature environments by virtue of an ultrasonic cavitation effect. The method has the characteristics of low raw material cost, simple equipment, environmental friendliness and the like, the synthesis process is simple, convenient, feasible and highly controllable, Cu < 2 + > is slowly released skillfully based on a mixed ligand complex system, the difference extreme temperature difference between the local high temperature and the external environment of the ultrasonic cavitation effect is utilized, and the method is suitable for industrial production. The controllable development of the pure-phase cuprous oxide polyhedral morphology is successfully realized, and the diversity of the material in the aspects of morphology design and structure regulation and control is expanded. The material has a wide application prospect in the aspect of functional material development in the field of clean energy.

The application provides a one-step synthesis method of adiponitrile, in which raw materials of butadiene and hydrocyanic acid are directly reacted to generate adiponitrile under the action of a rare earth metal mixed ligand catalyst and an auxiliary agent; the rare earth metal mixed ligand catalyst comprises a rare earth metal, a monodentate phosphite ligand and a polydentate phosphite ligand. The application forms a rare earth metal mixed ligand catalyst with high catalytic performance and high stability by taking a rare earth metal as a catalyst, a monodentate phosphite ligand and a polydentate phosphite ligand, and combines with an auxiliary agent to efficiently catalyze butadiene and two molecules of hydrocyanic acid to directly obtain adiponitrile. The method greatly simplifies a process flow of producing adiponitrile by taking butadiene and hydrocyanic acid as raw materials, has high raw material conversion rate and adiponitrile selectivity, has low operation cost, and is suitable for large-scale industrial production.

The invention discloses a defect control synthesis method for a zeolite imidazole framework material with pre-component introduction and selective etching and catalytic hydrogenation application, and belongs to the field of inorganic and organic material design. According to the invention, a method of mixing ligands at room temperature is adopted, the proportion of two ligands added during synthesis is controlled to prepare a zeolite imidazole framework material with an adjustable and controllable ligand proportion, and the heating condition of the zeolite imidazole framework material is controlled to completely remove the thermally unstable ligands without influencing the structure of the thermally stable ligands. And further obtaining the zeolite imidazole framework material with quantitative defects. According to the method, defects are constructed, and meanwhile, a hindered Lewis acid-base pair (FLP) is formed and can be used for catalytic hydrogenation reaction. The synthesis method is simple in preparation process and can be widely applied to various different mixed ligand zeolite imidazole frameworks, so that FLP defect sites are obtained, and the defect amount and FLP catalytic sites in a zeolite imidazole framework material are controlled.

The application relates to the technical field of metal organic framework functional materials, and discloses a ZIF-8-based super-hydrophobic MOF as well as a preparation method and application thereof. The ZIF-8-based super-hydrophobic MOF is prepared by the following method: 2-methyl imidazole and fluorine-containing ligand FL are used as mixed ligands to perform a coordination reaction with Zn ions to obtain ZIF-8-FL material; the ZIF-8-FL material is grafted and modified with a modifying agent under the action of an acid-binding agent, and the ZIF-8-based super-hydrophobic MOF is obtained; wherein the modifying agent is alkyl acid chloride or fluorine-containing anhydride. The ZIF-8-based super-hydrophobic MOF is prepared by introducing mixed ligands and grafting and modifying, and has the advantages of simple process, low cost and suitability for large-scale production. The ZIF-8-based super-hydrophobic MOF prepared by the application has high chemical stability and excellent hydrophobic performance in an acidic environment, avoids the defect that conventional MOFs are prone to degradation, has excellent separation efficiency and selectivity in an oil-water separation process, can effectively separate oil-water mixtures in various complex systems, and has wide market application prospect and economic benefits.

The application provides a cobalt-based metal organic framework compound, a preparation method and application; the chemical formula of the cobalt-based metal organic framework compound is [Co2(F-tzba)2(bpy)2]·DMF·0.5C2H5OH. The application also relates to a preparation method of the compound, under solvent thermal reaction conditions, a cobalt-based metal organic framework compound is prepared by using a benzoic acid containing fluorine and a tetrazole group and a 4,4'-bipyridine mixed ligand. The preparation process is simple, the reaction condition is mild, mixed ligands are used, the ligands contain fluorine and a tetrazole functional group, finally, a constructed metal organic framework compound is obtained, and the compound can be applied to selective separation of ethyne / ethylene and ethane / ethylene as a potential adsorption and separation material.

The invention belongs to the technical field of catalytic materials, and particularly relates to a carbon dioxide cycloaddition reaction catalyst and a preparation method and application thereof. Two novel metal organic framework carbon dioxide cycloaddition reaction catalysts are prepared by adopting mixed ligands, and the structures of the catalysts are characterized. The catalytic efficiency of cycloaddition of the compound to epoxypropane within 24 h is the highest and reaches 99% or above, and the structure of the compound is kept stable after three times of circulation. In addition, under the conditions, the catalyst also has certain catalytic activity on epoxy chloropropane, epoxy bromopropane, styrene oxide and other epoxy compounds. Especially, the epoxypropane structure is kept stable after three times of circulation. Therefore, the invention provides a new technical path for efficient utilization of carbon dioxide under mild conditions, and also provides a good foundation for designing a better heterogeneous catalytic system in the field of global climate control to continuously fix carbon dioxide.

The invention provides a water-phase quantum dot and a preparation method and application thereof, the water-phase quantum dot is modified with a mixed ligand, and the mixed ligand comprises a combination of a neutral organic ligand and a charged organic ligand; in addition, the neutral organic ligand and the charged organic ligand further comprise functional groups coordinated with the surfaces of the quantum dots. The water-phase quantum dot provided by the invention is modified with a neutral organic ligand and a charged organic ligand, has good solution stability in diluted and high-concentration electrolyte solutions, has good photochemical stability under strong light excitation, and can be used as a high-sensitivity fluorescent probe for biochemical analysis after being biologically modified; the method is used for high-sensitivity and high-specificity water-phase biochemical analysis.

This application proposes a metal organic framework containing an electron-withdrawing group, a preparation method thereof, and an application thereof. The method for preparing the metal organic framework containing an electron-withdrawing group comprises: (1) mixing a metal salt, a regulator, and a first organic solvent to obtain a first solution; (2) heating the first solution for a first time, cooling it, and adding a mixed ligand to form a second solution, wherein the mixed ligand comprises an organic ligand containing an electron-withdrawing group and an organic ligand not containing an electron-withdrawing group, wherein the electron-withdrawing group comprises at least one of a nitro group, a cyano group, a fluorine atom, a chlorine atom, and a trifluoromethyl group; and (3) heating the second solution, cooling it, centrifuging it, and drying it to obtain the metal organic framework containing an electron-withdrawing group. In this way, the light absorption capacity of the metal organic framework is improved, the separation and transfer of photogenerated carriers of the metal organic framework are promoted, and the rate of hydrogen production by catalyzing water decomposition as a photocatalyst is increased.