52results about How to "Improve electron-attracting ability" patented technology

The invention discloses a compound taking heteroatom-containing benzfluorenone as a core and application of the compound to an organic electroluminescence device. The compound takes the heteroatom-containing benzfluorenone as the core and has the characteristics that molecules are not easy to crystallize or gather, and a good film forming property is realized. When the compound disclosed by the invention is used as a luminescent layer material of the organic electroluminescence device, the current efficiency of the device is greatly improved; meanwhile, the life of the device is obviously prolonged.

The invention discloses a cyano-modified pyridino-imidazole derivative as well as a preparation method and application thereof, wherein the cyano-modified pyridino-imidazole derivative has a molecularstructure as shown in a formula (I); in the formula, R1 is hydrogen or cyano, R2 is hydrogen or cyano, and R1 and R2 are not hydrogen at the same time. According to the invention, C-H-Pi stacking structures and cyano groups are introduced into the pyridino imidazole derivatives to obtain higher fluorescence quantum yield, and enhanced electron withdrawing capacity of acceptor groups and spectralred shift; in addition, the derivatives also have better AIE effect, efficient TADF (thermally activated delayed fluorescence) property, good thermal stability and solubility. Therefore, the materialcan be used as a red light emitting material, a light emitting device or an intelligent light emitting material, and can be applied to the fields of full-color display and solid-state lighting.

The invention relates to a preparation method and application of a hypochloric acid-responsive fluorescence sensing material, belonging to the technical field of chemiluminescence sensing materials. The hypochloric acid-responsive fluorescence sensing material provided by the invention is a chemiluminescence sensing material prepared through an electrophilic substitution reaction with coumarin-6-carboxylic acid and thiosemicarbazide as basic raw materials and absolute methanol as a solvent. The fluorescence sensing material prepared in the invention has good water-solubility and biocompatibility, is rapid in response, and can realize sensitive and selective recognition of OCl<->; the changes of fluorescence signals are visible to naked eyes under the illumination of an ultraviolet lamp; interference caused by other common negative ions and active oxygen substances is small; and the fluorescence sensing material successfully realizes imaging of target ions in biological cells.

The invention relates to a landfill leachate treatment method and especially relates to a method for singlet state oxygen treatment on landfill leachate. The method comprises adding pyruvic acid as a catalyst and peroxides (such as peroxymonosulfate and percarbonate) as oxidizing agents into landfill leachate, carrying out stirring for a reaction, and carrying out biological treatment. The peroxides undergo a reaction in the presence of pyruvic acid as a catalyst to produce a dual-epoxy intermediate, the dual-epoxy intermediate and the peroxides further undergo a reaction to produce singlet state oxygen and pyruvic acid, the pyruvic acid sequentially catalyzes the peroxide reaction and produces cyclic catalysis effects in the reaction, and the produced high-activity singlet state oxygen fast acts difficultly degraded organic pollutants in landfill leachate and transforms the organic pollutants into biodegradable micromolecule compounds so that biodegradability is improved. The method has high treatment efficiency, does not produce poisonous and harmful side products, utilizes green, safe and no toxic or side effect pyruvic acid as a catalyst and peroxides as oxidizing agents, and is less influenced by water conditions.

The invention provides a method for cracking sludge by virtue of singlet oxygen and relates to a sludge cracking method. The method comprises the steps of adding a catalyst pyroracemic acid and antioxidants peroxides (peroxymonosulfate and percarbonate) into to-be-cracked sludge, stirring to react, pumping supernate of the cracked sludge back into an aeration tank, and carrying out treatments including dehydration and the like on the residual sludge. According to the method, a bisepoxy intermediate is generated by catalyzing peroxides by virtue of pyroracemic acid and further reacts with peroxides to generate singlet oxygen and pyroracemic acid, peroxides are continuously catalyzed by generated pyroracemic acid, and generated pyroracemic acid plays a role of circular catalysis during reaction, generated high-activity singlet oxygen is capable of damaging the structure of sludge floc and releasing bound water, improving the dehydration performance of sludge and damaging the cell structures of microorganisms. The method has the characteristics that the sludge treatment effect is good, toxic and harmful products are not generated, a required carbon source is provided for sewage treatment, and the catalyst pyroracemic acid and the antioxidants peroxides are environmentally friendly and safe and have no toxic and side effects.

The invention relates to the technical field of biochemical detection, in particular to a fluorenyl salicylaldehyde hydrazine derivative and a preparation method and application thereof. This type of compound can freely enter and exit the cell and specifically accumulate in the intracellular lipid droplet, changing from the original no fluorescence to strong fluorescence. Compared with the solid-state fluorescence in vitro, there is basically no displacement, and the localization position of the probe can be accurately judged, so as to realize the study of the structure, behavior and physiology of lipid droplets in cells. Process monitoring has extremely broad application prospects in the fields of biology, medicine, health and energy.

The invention relates to a reverse osmosis concentrate treatment method and especially relates to a method for singlet state oxygen treatment on reverse osmosis concentrate. The method comprises adding pyruvic acid into water to be treated, carrying out reverse osmosis treatment, adding peroxides (such as peroxymonosulfate and percarbonate) into the pyruvic acid-containing reverse osmosis concentrate, carrying out stirring and carrying a reaction process. Pyruvic acid is bonded to calcium and magnesium ions in water to be treated so that a pyruvate complex is produced and scale inhibition effects are obtained, the peroxides undergo a reaction in the presence of the pyruvate as a catalyst to produce singlet state oxygen, and the produced high-activity singlet state oxygen can fast react with pollutants in the reverse osmosis concentrate, oxidize organic matters and inactivate microbes so that pollutant removal is realized. The method utilizes green and safe pyruvic acid and peroxides without toxic or side effect, has high reaction depollution efficiency, does not produce poisonous and harmful by-products and is a high-efficiency reverse osmosis concentrate treatment method with functions of complexation scale inhibition and oxidation pollutant removal.

The invention provides a method for utilizing singlet oxygen for removing algae and relates to an algae removal method. According to the algae removal method, a catalyst pyruvic acid and an oxidizing agent peroxide such as monosulfate and percarbonate are added into water containing algae, and stirred, and react to complete algae removal. Pyruvic acid catalyzes the peroxide to generate a double-resin intermediate, the double-resin intermediate reacts with the peroxide to generate singlet oxygen and pyruvic acid, generated pyruvic acid continues to catalyze the peroxide, and has a circular catalytic effect in the reaction process, and the generated high-activity singlet oxygen acts on the algae fast, kills algae cells, enables the algae to be inactivated, and achieves the purpose of algae removal. The algae removal method has the advantages that algae removal efficiency is high, generation of poisonous and harmful products is avoided, the catalyst pyruvic acid and the oxidizing agent peroxide are environmentally friendly, safe and free of toxic and side effects, can be applied on a large scale and are more suitable for emergency treatment of algae outbreak, and the reaction is affected little by the water body condition.

The invention discloses a benzothiadiazole unit-based A-pi-A'-pi-A type acceptor photovoltaic material, and a preparation method and an application thereof, and belongs to the field of organic photoelectric materials. The material adopts benzothiadiazole as a nucleus, adopts a nitro group and a 4-fluorophenyl group as end groups, and adopts a 2-cyano-styryl group as a pi connecting bond; and alkyl-modified thienyl groups are introduced to two sides of the benzothiadiazole unit in order to improve the solubility of the material, extend the conjugation length of a molecule and enhance the intramolecular charge transfer ability. The organic small molecular material obtains Jsc exceeding 1.0 mA cm<-2>, and has large redshifts being 34 nm and 38 nm respectively. The PCE of the material is increased from 0.1% to 1.0% and increases 10 times after replacing the nitro end group (M1) with the 4-fluorophenyl group (M2) due to the M2 having high Jsc and Voc, so the M2 material has higher potentialto be a high-efficiency non-fullerene small molecular acceptor photovoltaic material than the M1.

The invention relates to a catalyst as well as a preparation method and an application thereof. The catalyst comprises a carbon nanotube and an active ingredient Ce4+xTi4+y(SO42-)z bonded to the carbon nanotube, wherein x is less than y, and 2x+2y is greater than z; the catalyst has high catalytic activity and stability, and is a biodiesel catalyst with excellent performance. The preparation method of the catalyst comprises the following steps: S1, mixing the carbon nanotube, TiO2, Ce(NO3)3.6H2O and concentrated sulfuric acid to obtain a mixture; S2, heating the mixture at 150-250 DEG C to obtain a reactant; and S3, filtering the reactant to obtain a precipitate, washing the precipitate to prepare the catalyst.

The invention discloses a preparation method of a sulfur-doped tin disulfide/tin dioxide@C/rGO material and application of the sulfur-doped tin disulfide/tin dioxide@C/rGO material in a lithium ion battery. The preparation method comprises the following steps: dissolving SnCl2 into concentrated HCl to form a stable SnCl2 solution; mixing a SnCl2 solution, GO colloid, thiourea, L-ascorbic acid andthe like, and performing stirring to form a uniform mixed solution; carrying out water bath negative pressure evaporation on the mixed solution, and then carrying out hydrothermal treatment to obtaina precursor; after a hydrothermal kettle is cooled to room temperature, centrifuging the precursor, and sequentially washing the obtained precipitate with water and alcohol; and transferring the precipitate into the hydrothermal kettle again, adding H2O2, carrying out hydrothermal treatment again, cooling a sample in the kettle to room temperature, performing centrifuging, performing washing withwater, performing washing with alcohol, and carrying out freeze drying on the obtained precipitate to obtain the sulfur-doped tin disulfide/tin dioxide@C/rGO material. The preparation method is simpleto operate, environment-friendly and low in energy consumption, and the prepared nano composite electrode material has excellent electrochemical performance.

The invention belongs to the technical field of nano material synthesis, and relates to a non-metal functional group edge modified composite photocatalyst as well as a preparation method and application thereof, in particular to a g-C3N4/4-PTSC composite photocatalyst as well as a preparation method and application thereof. According to the method, a g-C3N4/4-PTSC nano sheet is synthesized in onestep by utilizing an efficient and convenient thermal polycondensation method, the g-C3N4/4-PTSC photocatalyst with a stable structure is formed, and stable and efficient hydrogen production by photolysis of water is realized; the prepared photocatalyst has good stability and repeatability and has the advantages that the separation efficiency of photo-induced electron-hole pairs is high, the preparation method is simple and rapid, the cost is low, no pollution is caused to the environment, and the hydrogen production performance is excellent.

The invention relates to a thermally activated delayed fluorescence material, a preparation method thereof and an organic electroluminescent device. The preparation method comprises the following steps: adding a catalyst, an alkaline substance and a solvent into a first reactant and a second reactant, wherein the first reactant is a bromide of cyclopenta[def]fluorene-4,8-dione; carrying out a substitution reaction on the first reactant and the second reactant to obtain a reacted solution; and carrying out impurity removal treatment on the reacted solution to obtain the thermally activated delayed fluorescence material with a structural general formula shown in the specification. Cyclopenta[def]fluorene-4,4'-dicarboxylic acid is used as a receptor unit, the triplet state energy level of thereceptor unit can be reduced, and the intramolecular charge transfer state property of the receptor unit can be enhanced to achieve luminescent red shift of molecules; and in addition, the interaction between luminescent molecules is reduced by adjusting the number of donor units and the binding positions of the donor units and the receptor unit, so the light extraction efficiency of the luminescent molecules is improved.

The invention discloses a compound with a nitro-based electron withdrawing group, a non-fullerene electron acceptor material and a preparation method of the non-fullerene electron acceptor material, wherein the compound with the nitro-based electron withdrawing group has the following structure defined in the specification, and R1 and R2 are H, F, Cl, Br, I or -CH3. According to the invention, themain functional group in the compound with the nitro-based electron withdrawing group provided by the invention is nitro and does not contain cyano (-C[triplebond]N), so that the compound has the advantage of environmental friendliness; and the non-fullerene electron acceptor material prepared from the compound has low LUMO energy level and strong electron affinity compared with the existing non-fullerene electron acceptor material, and is beneficial to enhancing the electron withdrawing capacity, enhancing the utilization ratio of solar energy and enhancing the transmission performance of electrons.

The invention proposes an imidazo[1,2-a]pyridine ratiometric pH fluorescent probe and a preparation method thereof, and the probe is used for the determination of extremely acidic pH changes in living cells and Escherichia coli. The preparation method is as follows: under the protection of an inert gas, N, N-dimethylbenzaldehyde or its derivatives, 4-chloroaniline and sodium bicarbonate are dissolved in methanol, and heated to reflux to obtain a crude product; and 2-(4-methoxyphenyl)-7-methylimidazo[1,2-a]pyridine dissolved in N,N-dimethylformamide, with potassium tert-butoxide as alkaline reagent, heating Reflux reaction; separated by silica gel column. The probe exhibits ratiometric emission fluorescence characteristics under extremely acidic conditions, and at the same time has the ability to H ⁺ It has the advantages of high sensitivity, good selectivity and large Stokes shift.

The invention discloses an organic compound as shown in a formula I and an organic electroluminescent device thereof. In the formula I, R1 and R2 are nitrogen-containing tricyclic groups, nitrogen-containing tetracyclic groups, nitrogen-containing pentacyclic groups or amino groups. The organic compound provided by the invention has the advantages of low driving voltage and high current efficiency when applied to the organic electroluminescent device.

The invention discloses a dithioxanthone derivative, a preparation method thereof and an application in an electroluminescent device. The general structural formula of the dithioxanthone derivatives is shown in formula I and formula II: wherein, X is selected from a sulfur atom or a sulfone group; R ₁ , R ₂ , R ₃ , R ₄ and R ₅ Each independently selected from a hydrogen atom, an arylamino group of 6 to 30 carbon atoms, an aryl group of 6 to 30 carbon atoms, a substituted aryl group of 6 to 30 carbon atoms, a substituted aromatic group of 5 to 50 ring atoms heterocyclic group. In the present invention, oxidized and unoxidized dithioxanthone derivatives introduce a variety of electron-donating groups, realize effective donor-acceptor molecular design, and can effectively separate the highest occupied orbital energy level and the lowest empty orbital of molecules The energy level not only reduces the energy level difference between the singlet state and the triplet state, but also realizes the property of thermally activated delayed fluorescence, and realizes the emission of different colors. Applied to the light-emitting layer of an organic electroluminescent device, the device has excellent performance.