221 results about "Salicylaldehyde" patented technology

The invention discloses an antibacterial material rich in a bismuth metal organic framework and a preparation method thereof, the method comprises the following steps: adding an indole monomer and an alcohol monomer into a solvent, and then adding nitrosalicylaldehyde into the solvent to obtain a spiropyran compound; the preparation method comprises the following steps: adding humic acid into a binary solvent consisting of dioxane and butanol to obtain a mixed solution; the ratio of the mass of the humic acid to the volume of the binary solvent is (2-3): (20-40) g / ml; sequentially adding a bismuth source, 2-bromo-5-(trifluoromethyl) pyridine and 4-(trifluoromethyl) phenylboronic acid into the mixed solution to obtain a bismuth metal organic framework; and adding the spiropyran compound into the bismuth metal organic framework to obtain the antibacterial material rich in the bismuth metal organic framework. The antibacterial capability of the antibacterial material is improved.

The invention belongs to the technical field of organic synthesis, and particularly relates to a salicylaldehyde hydrazone bridged organic boron photoinitiator as well as a preparation method and application thereof. The structural formula of the salicylaldehyde hydrazone bridged organic boron photoinitiator is as shown in formula I, wherein R is H or halogen atom; the salicylaldehyde hydrazone bridged organic boron photoinitiator has a vertical spatial configuration formed by a seven-membered ring and a six-membered ring. A framework of the salicylaldehyde hydrazone bridged organic boron photoinitiator has a unique vertical spatial configuration, generation of a spinning triplet state can be effectively promoted through orbital angular momentum regulation and control, and a more favorable excited state characteristic is provided for a photoinitiation process. The absorption wavelength and the emission spectrum of an LED light source are well overlapped, and high reaction activity can still be kept under the conditions of low irradiation intensity (lt, 60 mW / cm) and short exposure time (lt, 60 s). In addition, the preparation method of the salicylaldehyde hydrazone bridged organic boron photoinitiator is simple and efficient, the raw material cost is low, and the salicylaldehyde hydrazone bridged organic boron photoinitiator has a wide application prospect.

The invention relates to the field of printing inks and discloses a wear-resistant and scratch-resistant printing ink, a preparation method thereof, and an application thereof. The printing ink comprises: a modified aqueous polyurethane emulsion, a modified mica sheet, a pigment, an additive, and deionized water; the modified aqueous polyurethane emulsion is prepared by introducing a double-terminal hydroxyl chain extender into a polymer; the double-terminal hydroxyl chain extender is reacted with a Schiff base intermediate obtained by reacting salicylaldehyde and p-aminobenzyl alcohol and isocyanoethyl methacrylate, and the obtained double-bonded Schiff base intermediate is reacted with 1,1,3,3-tetramethyldisiloxane to prepare the ink; the modified mica sheet is reacted with triethylenetetramine, formaldehyde, and acetone, and then formaldehyde is added under alkaline conditions for polycondensation, the obtained cationic polymer and glutaraldehyde are prepared into the cationic mica sheet, and finally polyaniline is grown on the surface of the mica sheet through interfacial polymerization. The ink prepared by the invention has good adhesion, high hardness, and excellent water resistance, wear resistance, heat resistance, antistatic properties, and antibacterial properties.

A volatile composition dispenser includes a reservoir comprising a volatile composition; and an evaporative surface in fluid communication with the reservoir. The volatile composition comprises a first fragrance material that is a meta-(C1-C4 alkoxy)salicylaldehyde, and the first fragrance material is present in an amount of at least 0.0005%, by weight of the volatile composition. A process of treating an environment with a volatile composition dispenser includes providing a volatile composition dispenser and providing the meta-(C1-C4 alkoxy)salicylaldehyde to the environment. A weight loss of the volatile composition over less than 11 days ranges from 7% to 20%.

The invention discloses a phosphorus-silicon type Schiff base derivative flame retardant and a preparation method and application thereof.The preparation method comprises the steps that salicylaldehyde and 1, 3-bis (3-aminopropyl)-1, 1, 3, 3-tetramethyldisiloxane react to obtain silicon-containing Schiff base, then P-H on hypophosphorous acid substances and-C = N-on the silicon-containing Schiff base are subjected to an addition reaction, and the phosphorus-silicon type Schiff base derivative flame retardant is obtained. The phosphorus-silicon type Schiff base derivative flame retardant is prepared. The flame retardant contains a plurality of groups such as-OH,-NH-and the like, can achieve molecular-level dispersion in a high polymer material, and plays an efficient flame-retardant role. The flame retardant has a gas-phase and condensed-phase dual-phase flame retardant effect: in the gas phase, the effects of dilution and free radical capture are exerted; and in a condensed phase, char formation can be promoted and a barrier effect can be exerted. In addition, due to the existence of organic silicon, a compact carbon layer with a specific-Si-O-bond or-Si-C-bond of siloxane can be generated during combustion, the protection effect of oxygen isolation and heat insulation is achieved, and the condensed phase flame retardant effect is enhanced. The phosphorus-silicon type Schiff base derivative flame retardant has a wide application prospect and can be applied to flame-retardant modification of polyurethane and epoxy resin.

The invention relates to the field of copper plating solutions, and provides a low-stress chemical copper plating solution for a glass substrate and a preparation method of the low-stress chemical copper plating solution. The invention discloses a copper ion carboxyl chelate, which is composed of copper ion carboxyl chelate, 2, 2 '-bipyridine, polyethylene glycol-8000, lauryl sodium sulfate, a sodium carbonate buffer agent, deionized water and a pretreatment solvent, and the copper ion carboxyl chelate is prepared by chelating a polyacrylate-itaconic acid copolymer with copper chloride and then carrying out stepwise cross-linking with epichlorohydrin and N, N'-methylene bisacrylamide. The copper-bis-salicylaldehyde ethylenediamine complex is obtained by reacting bis-salicylaldehyde ethylenediamine with copper acetate, crystallizing and purifying. The preparation method comprises the steps of solvent premixing, chelating activation, staged additive integration, pH dynamic regulation and control and plating solution purification, through nitrogen protection, high-shear stirring and accurate pH regulation, the problems that a traditional chemical copper plating layer is high in stress and poor in conductivity are solved, and the method is suitable for high-precision glass substrate surface metallization.

The invention discloses quick heat-conducting precoated sand and a preparation process thereof, and relates to the technical field of precoated sand, the quick heat-conducting precoated sand comprises the following raw materials by weight: 100-105 parts of crude sand, 6-8 parts of a modified resin prepolymer, 2-4 parts of modified POE, 3.5-4.5 parts of a lubricant, and 3-5 parts of nano silicon nitride. The modified POE has a relatively strong high-temperature toughening effect on the modified resin prepolymer, can also form chemical crosslinking with the modified resin prepolymer, and has relatively strong compatibility with other raw materials in the precoated sand. The modified resin prepolymer is obtained by heating and ring-opening polymerization of a benzoxazine monomer obtained by reaction of 5-nitrosalicylaldehyde, 2, 4-bis (trifluoromethyl)-5-pyrimidinyl ethyl formate, paraformaldehyde, furfuryl amine and the like, the curing temperature of the modified resin prepolymer is reduced, the thermal stability is improved, and improvement of the high temperature resistance of the precoated sand is facilitated.

Embodiments of the present disclosure describe metal organic framework (MOF)-like composite material (MOFite) including a salicylaldehydate-based iron metal organic framework composition and graphite, a lithium-ion battery including a cathode and an anode including a salicylaldehydate-based iron metal organic framework composition and graphite, and a scalable synthesis methods for salicylaldehydate-based metal-organic frameworks (SA-MOFs), specifically Fe-Tp, and their applications in lithium-ion batteries (LIBs).

The preparation method comprises the following steps: in the presence of a cobalt catalyst and a salicylaldehyde Schiff base ligand, carrying out carbonyl synthesis reaction on C5-C20 olefin and synthesis gas at a certain reaction temperature and pressure to generate C6-C21 aldehyde. The salicylaldehyde Schiff base coordination cobalt catalyst is introduced, the electronic structure of the catalyst is changed, the capacity of the catalyst for adsorbing and activating olefin and synthesis gas is improved, the reaction temperature and pressure can be reduced, the high-carbon aldehyde yield is greatly increased, and the method has good application prospects and industrial application potential in the field of petrochemical engineering.

This invention provides a polynuclear metal cluster based on salicylaldehyde acetal-2-thiophenol ligand, its preparation method, and its application. The chemical formula of the polynuclear metal cluster is Co4(C 13 H9NOS)6·2CH3CN·CH3OH, where C 13 H9NOS is salicylaldehyde acetal-2-thiophenol, with Co forming a six-coordinate octahedral configuration with N, O, and S. The salicylaldehyde acetal-2-thiophenol ligand in the polynuclear metal cluster of this invention can effectively stabilize the active center of metallic cobalt, resulting in a polynuclear metal cluster with significant OER activity and broad prospects for practical applications.

The invention belongs to the technical field of high polymer chemistry and material science, and particularly relates to application of a salicylaldehyde Schiff base chiral polymer in iron and copper ion detection, and the structural formula of the salicylaldehyde Schiff base chiral polymer is one of the following structures shown in the specification. . The salicylaldehyde Schiff base chiral polymer has high selectivity to copper ions and iron ions, and qualitative detection of the copper ions and the iron ions can be achieved according to changes of ultraviolet absorption spectrums, digital circular dichroism spectrums and fluorescence spectrums before and after coordination of the salicylaldehyde Schiff base chiral polymer with the copper ions and the iron ions.

The present invention discloses a class of perfluorophenyl-substituted salicylaldimine nickel complexes, a preparation method thereof, and an application thereof in highly active catalytic norbornene polymerization. The preparation method includes the following steps: first metallizing a neutral ligand with sodium hydride, then reacting it with a nickel metal raw material compound in an organic medium, and then obtaining the target compound through filtration, concentration, and recrystallization steps. The perfluorophenyl-substituted salicylaldimine nickel complex of the present invention is a highly efficient norbornene addition polymerization catalyst. The perfluorophenyl-substituted salicylaldimine nickel complex of the present invention has very obvious advantages: the raw materials are easily available, the synthesis route is simple, the product yield is high, the polymerization performance can be regulated by adjusting the substituent structure, and it has a wide application prospect. Its structural formula is shown as follows:

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 present invention relates to the technical field of luminescent materials, and specifically relates to a transition metal antibacterial fluorescent waterborne polyurethane material, a preparation method thereof, and an application thereof. First, salicylaldehyde and ethanolamine are used as reactants to obtain Schiff base salicylaldehyde ethanolamine by reflux heating; salicylaldehyde ethanolamine is used as a ligand to reflux with zinc acetate to prepare a blue fluorescent transition metal complex. The polymer polyol and isocyanate are reacted and condensed, and then a hydrophilic group is introduced through a chain extension reaction and then reacted with transition metal complex powders in different proportions, and they are incorporated into the polyurethane molecular chain segment, and then emulsified and the organic solvent is removed to obtain an antibacterial blue fluorescent waterborne polyurethane material. The fluorescent waterborne polyurethane prepared by the present invention has the characteristics of good storage stability, high fluorescence intensity, environmental friendliness, high antibacterial rate, etc., and has the advantages of convenient use, recyclability, wide application fields, etc.

The invention relates to the technical field of catalysts for synthesizing ethylene propylene rubber, and discloses a vanadium-based catalyst composition and a preparation method and application thereof.The vanadium-based catalyst composition comprises a vanadium catalyst, an organic aluminum compound and an activation accelerant, and the preparation method of the vanadium catalyst comprises the steps that a salicylaldehyde compound is dissolved with methyl alcohol or ethyl alcohol; and adding an organic amine compound while stirring, adding a vanadium compound after reaction, and continuously reacting to obtain the vanadium catalyst. When the prepared vanadium catalyst composition is applied to ethylene and propylene copolymerization reaction, the reactivity rate of ethylene and propylene monomers can be adjusted according to the structure of the vanadium catalyst, the C3 content of the prepared ethylene propylene rubber is 26.2-36.4 wt%, the double bond content of ethylene propylene diene monomer is adjustable in the range of 3.7-15.2 wt%, and post-processing application is facilitated.

The invention provides a dynamic continuous flow synthesis process of 5-nitrosalicylaldehyde, which comprises the following steps: filling heteropoly acid loaded on spherical activated carbon into a dynamic continuous flow reaction tube, giving a certain external temperature, adding salicylaldehyde into an organic solvent, and reacting at a certain temperature to obtain the 5-nitrosalicylaldehyde. And simultaneously pumping the 5-nitrosalicylaldehyde and nitric acid into a dynamic continuous flow reaction tube filled with a heteropolyacid immobilized catalyst at a certain flow speed, and reacting to obtain the 5-nitrosalicylaldehyde. In the process of synthesizing the 5-nitrosalicylaldehyde, the raw material concentration, the raw material flow rate, the nitric acid flow rate and the reaction temperature are strictly controlled, so that a large amount of isomer impurities are prevented from being generated, the conversion rate during nitration is favorably improved, the reaction yield is improved, the wastewater discharge is reduced, and meanwhile, the safety risk of the traditional nitration kettle type reaction is reduced. Experimental results show that the yield of the 5-nitrosalicylaldehyde is 90% or above, and the purity of the 5-nitrosalicylaldehyde is 98% or above.

Embodiments of the present application provide a method for preparing a hydroxyl ortho-hydroxymethyl-substituted methylene-bridged substituted phenol, the method comprising the following steps: A1, reacting a substituted phenol with formaldehyde in the presence of a Lewis acid catalyst to prepare a substituted salicylaldehyde compound (2); A2, condensing the substituted salicylaldehyde compound (2) in a system containing formaldehyde and a Brønsted acid catalyst to prepare a methylene-bridged substituted salicylaldehyde compound (3); A3, reducing the methylene-bridged substituted salicylaldehyde compound (3) to prepare a hydroxyl ortho-hydroxymethyl-substituted methylene-bridged substituted phenol (4). Embodiments of the present application can improve the yield and chemical purity of the prepared hydroxyl ortho-hydroxymethyl-substituted methylene-bridged substituted phenol. According to other embodiments of the present application, a method for preparing a polyphenol compound containing multiple phenol units is also provided.

Based on the excellent magnetism, synthetic difficulty and existing scarcity of asymmetric dinuclear dysprosium single-molecule magnets, a class of asymmetric dinuclear dysprosium single-molecule magnets based on bis-acylhydrazone ligands, their synthesis methods and relaxation behaviors are disclosed. Such magnets are prepared by solvothermal reaction of bis(halogen-substituted salicylaldehyde) -2,6-azoxypyridine dicarboxylic acid hydrazone ligand, dysprosium nitrate and triethylamine in a methanol-acetonitrile mixed solvent. Their common structural feature is that the acylhydrazone pockets on both wings of the ligand chelate one Dy<supgt;III< / supgt; ion respectively, and due to the difference in the ligand coordination sites of counter ions and solvent molecules, the coordination geometries of the two Dy<supgt;III< / supgt> ions in the magnet are different, showing a rare asymmetric dinuclear structure based on symmetry bipolar ligands. The alternating current susceptibility of such asymmetric dinuclear dysprosium magnets exhibits frequency-dependent magnetic relaxation phenomena even in zero field, and turns into a double relaxation process under an external magnetic field, possessing the typical characteristics of single-molecule magnets.

The present invention relates to the technical field of heavy metal adsorbents, and specifically relates to a renewable adsorbent for removing heavy metal ions and a preparation method thereof. The renewable adsorbent comprises the following raw materials in parts by weight: 10-15 parts of modified loofah sponge, 8-12 parts of salicylaldehyde thiosemicarbazide triazine; the preparation raw materials of the modified loofah sponge are made from loofah sponge, epichlorohydrin and pentaerythritol tetra(3-mercaptopropionate), and the preparation raw materials of the salicylaldehyde thiosemicarbazide triazine comprise the following components in parts by weight: 2-3 parts of 5-chloromethyl salicylaldehyde, 1.2-1.6 parts of thiosemicarbazide, 6.5-9.7 parts of cyanuric chloride. The renewable adsorbent prepared by the present invention has a high adsorption capacity and good cycling performance.

The application discloses a kind of multiple stimulus response type Zn (II) -DASA complex molecular switch and preparation method and application thereof.The Zn (II) -DASA complex molecular switch is prepared by grafting DASA ligand with salicylaldehyde acylhydrazone and ZnCl2 in methanol, and crystal is obtained by solution evaporation method.The Zn (II) -DASA complex molecular switch of the application exhibits multifunctional switching characteristics of solid-state light, heat and water-induced color change and fluorescence emission, and has wide application prospect in the field of information storage medium such as photo-thermal color-reproducible erasable material, intelligent display material or anti-fake encryption material.

The application belongs to the field of organic chemistry, material science and corrosion engineering, and discloses synthesis and application of a corrosion inhibitor based on rhodamine 6G. The fluorescent corrosion inhibitor LDS is obtained by synthesizing rhodamine 6G and hydrazine hydrate through a Schiff base reaction and salicylaldehyde. The corrosion inhibitor LDS not only has an inhibiting effect on carbon steel, but also can realize detection functions of corrosion iron ions and environment pH through a fluorescent signal, and further early warning of metal corrosion.

A fluorine-doped CD is synthesized through one-pot solvothermal synthesis as follows: dissolving 4-(diethylamino)salicylaldehyde and sodium fluoride in deionized water to produce an aqueous solution, and ultrasonically mixing the aqueous solution with phosphoric acid thoroughly to produce a mixture; placing the mixture in a reactor lined with polytetrafluoroethylene (PTFE), and allowing a reaction for 1 h to 3 h under heating at 180° C. to 220° C.; cooling, and conducting centrifugation to remove unreacted raw materials; collecting a resulting supernatant, and conducting dialysis in a dialysis bag for 24 h to 48 h to produce a sample; and lyophilizing the sample to produce the fluorine-doped CD. The fluorine-doped CD is adopted as a chromogenic agent to achieve the detection of PFCs, and accordingly, a enrichment chromogenic membrane is prepared in combination with UiO-66-F4. The enrichment chromogenic membrane allows convenient detection and can achieve the in-situ monitoring of three PFCs in water.

The invention relates to a fluorescent probe based on substituent group type and position effect as well as preparation and application of the fluorescent probe. The preparation method comprises the following steps: firstly, carrying out quaternization on pyridine with an electron withdrawing group in acetonitrile to generate pyridinium salt; then, by taking ethanol as a solvent and ammonium acetate or piperidine as a catalyst, carrying out catalytic condensation reaction on the aldehyde group of the salicylaldehyde or the derivative thereof and the methyl group of the pyridinium salt; through the two-step reaction, a target product with a D-pi-A structure can be efficiently obtained. Accurate structural design and controllable synthesis of organic molecules are focused, different substituent groups are introduced into a D nucleus and an A nucleus of a traditional D-A structure respectively, meanwhile, the positions of the substituent groups on a phenol group are adjusted, and the emission wavelength of the fluorescent molecules is adjusted and controlled by adjusting and controlling electron cloud distribution and conjugate length. The raw materials are low in cost and easy to obtain, convenient and efficient large-scale preparation can be achieved, the production cost can be remarkably reduced, and energy consumption can be reduced.

The invention discloses a synthesis method of tilpotide, and belongs to the technical field of pharmacy. According to the method, 2-Cl CTC resin is adopted as initial resin, a solid-phase polypeptide synthesis method is adopted to obtain a polypeptide fragment 1 (1-10 amino acids), then a liquid-phase reaction is performed to prepare salicylaldehyde ester of the full-protection polypeptide fragment 1, and the salicylaldehyde ester of the fragment 1 is obtained after acidolysis; rinkAmide AM resin is used as initial resin, a polypeptide solid-phase synthesis method is used for preparing a polypeptide fragment 2 (the 11th amino acid to the 39th amino acid), then salicylaldehyde ester of a polypeptide fragment 1 and the fragment 2 are subjected to STL chemical connection, then acidolysis is performed to obtain a crude product of the tilpotide, a finished product of the tilpotide is obtained after purification, the purity reaches 99.4% or above, and the yield reaches 47%. According to the method, a two-stage method is adopted, and an STL chemical connection method is used for chemical connection, so that the method has the characteristics of low cost, high yield, high crude peptide purity and the like, and is more suitable for industrial production compared with a current main four-stage process.

The preparation method of the fluorescent probe (S) comprises the following steps: adding absolute ethyl alcohol into p-phenylenediamine, refluxing and dissolving the solution (solution A) while heating at 80 DEG C, dissolving salicylaldehyde into a proper amount of absolute ethyl alcohol (solution B), dropwise adding the solution B into the solution A, and stirring to obtain a mixed solution; heating reflux is kept at 80 DEG C in the whole process, stirring is continuously carried out, and after reflux is carried out for 2 hours, filtering is carried out to obtain a faint yellow solid, namely the fluorescent probe (S). The fluorescent probe can specifically recognize hydrogen sulfide (H2S) under the interference of common ions, is strong in anti-interference capability and high in sensitivity, and can be used for real-time monitoring and fluorescence imaging of endogenous H2S of cells and mouse tumors.

The invention relates to the technical field of organic synthesis, and discloses a synthesis process of salicylaldehyde. The process sequentially comprises three core stages: firstly, performing mechanochemical ball milling pretreatment on phenol, a catalytic complexing agent and a molecular sieve drying agent in an inert atmosphere; then, transferring the pretreated mixture into a reactor containing a composite solvent of sulfolane and ionic liquid [BMIM] PF6, and dropwise adding a hexamethylenetetramine solution under programmed temperature control to perform formylation reaction; and finally, cooling the reaction liquid, filtering, hydrolyzing the filtrate by using a phosphoric acid aqueous solution with gradient concentration, and separating the product in real time through azeotropic distillation. According to the process, mechanical activation, composite solvent and programmed reaction are combined, the process is continuous, and the reaction efficiency and selectivity are improved.

The application discloses a Schiff base catalyst, a preparation method thereof and a preparation method of allyl glycidyl ether. The Schiff base catalyst comprises a Schiff base ligand and a central metal ion, wherein the Schiff base ligand is a condensate of ethylenediamine, one molecule of 3,5-di-tert-butyl salicylaldehyde and one molecule of 5-tert-butyl salicylaldehyde, and the central metal ion is selected from any one of Sn, Al and Fe. The Schiff base catalyst can efficiently catalyze the ring opening of allyl alcohol and epichlorohydrin, and the reaction period can be compressed to 3 hours. Meanwhile, the asymmetric structure of the Schiff base complex can effectively control the ring opening position of epichlorohydrin, improve the ring opening selectivity, and the methylene ring opening selectivity can be up to 99%.

The invention relates to the technical field of polypropylene, and discloses a nano high-efficiency antibacterial polypropylene material and a preparation method thereof.The preparation method comprises the steps that polypropylene is subjected to melt grafting through 4-vinylaniline salicylaldehyde Schiff base, then the polypropylene is blended with nano silver, polypropylene and polystyrene, and the nano high-efficiency antibacterial polypropylene material is obtained. In the mixing process, the grafted polypropylene contains a salicylaldehyde Schiff base structure and forms a coordination effect with the surface of the nano-silver, so that the surface of the nano-silver is coated with the grafted polypropylene, the dispersion effect on the nano-silver is realized, and the agglomeration problem of the nano-silver is favorably improved. The diameter of an inhibition zone and the antibacterial property of the polystyrene-polypropylene material are improved. The grafted polypropylene improves the compatibility of polypropylene resin and polystyrene resin, forms a plastic alloy system with better mechanical properties, and has higher tensile strength and bending strength.

The present invention discloses a fluorescent material, its preparation method, and its application, belonging to the technical field of fluorescent materials. The invention utilizes a rapid solvent evaporation method to dope salicylaldehyde Schiff base with octafluoronaphthalene molecules to produce a fluorescent material with high stability and excellent luminescence properties. Compared to traditional fluorescent materials, this stimuli-responsive fluorescent material can maintain more stable performance over multiple cycles. By applying it to a screen printing process, a dynamically responsive anti-counterfeiting fluorescent pattern was successfully constructed on the surface of textiles, demonstrating its significant application value and market potential.

The invention discloses a metal-Salen complex functionalized graphene-based composite material as well as a preparation method and application thereof, and belongs to the technical field of energy storage materials. The composite material takes graphene oxide as a substrate, a Salen type ligand skeleton is grafted through a covalent bond, and a metal active center with an M-N2O2 structure is coordinated on the Salen type ligand skeleton. The preparation method comprises the following steps: carrying out amination on graphene oxide, carrying out Schiff base condensation on graphene oxide and salicylaldehyde to form a ligand, and carrying out coordination reaction on the ligand and metal salt. The composite material disclosed by the invention is coated on a commercial diaphragm and can be used for a lithium-sulfur battery. Through atomic-scale dispersed catalytic sites, effective interception and efficient bidirectional catalytic conversion of polysulfide are synergistically realized, uniform deposition of lithium ions can be guided to inhibit dendritic crystal growth, and the key problems of shuttling of polysulfide, slow reaction kinetics, negative electrode instability and the like in a lithium-sulfur battery are solved; and the rate capability, the cycle life and the safety of the lithium-sulfur battery are remarkably improved.