100 results about "Caesium carbonate" patented technology

The invention relates to a method for synthesizing 1, 2-allene ketone, and discloses a method for synthesizing 1, 2-allene ketone by taking eneyne, 1, 4-dihydropyridine and benzoyl fluoride as substrates, 2, 4, 5, 6-tetra (diphenylamino)-isophthalonitrile as a photocatalyst, 5, 6, 7, 8-tetrahydro-3-(2, 6-diisopropyl phenyl)-4H-cycloheptyl thiazole perchlorate as N-heterocyclic carbene, cesium carbonate as alkali and acetonitrile as a solvent through a one-pot method. And reacting at room temperature for 4 hours under visible light of 12W and 460nm LED blue light to obtain allene ketone. The reaction conditions are mild, and the method has good functional group tolerance.

The invention provides a beta '-sulfo-alpha, beta-unsaturated gamma-lactam derivative as well as a preparation method and application thereof, and belongs to the technical field of organic chemical synthesis. The beta '-thio-alpha, beta-unsaturated gamma-lactam derivative has a structure as shown in a formula I. According to the method disclosed by the invention, cesium carbonate is taken as alkali, and a molecular skeleton of the beta'-thio-alpha, beta-unsaturated gamma-lactam derivative is constructed through free radical coupling and olefin isomerization processes under the condition of blue light irradiation. Bioactivity evaluation shows that the beta '-sulfo-alpha, beta-unsaturated gamma-lactam derivative prepared by the method disclosed by the invention has an inhibition effect on MDA-MB-231 human breast cancer cells.

The invention discloses a preparation method of a perovskite active layer, a perovskite battery and a perovskite material, and belongs to the technical field of perovskite batteries. According to the invention, bisphosphonate is added when the perovskite active layer is prepared, and the bisphosphonate is obtained by carrying out a deprotonation reaction on 1-aminodecane-1, 1-diphosphonic acid and methylamine, formamidine iodine or cesium carbonate. The bisphosphonate can be anchored on the surface of the substrate and form a self-assembled monomolecular structure, a simple and effective coating process is realized, the bisphosphonate structure of the bisphosphonate is beneficial to anchoring on the substrate, the possibility and effectiveness of anchoring the substrate are increased, the combination of the perovskite active layer and the substrate is enhanced, the formation of nano-pores is reduced, and the photoelectric conversion efficiency is improved. In addition, the introduced cations MA < + >, FA < + > and Cs < + > not only can enhance the self-assembly capability of the bisphosphonate, but also can be used as nucleating agents to promote the growth of perovskite crystals and improve the quality of the perovskite crystals.

The invention relates to a method for synthesizing tetrasubstituted ‑1,3‑enedicarboxylic acid, and discloses a method for synthesizing tetrasubstituted ‑1,3‑enedicarboxylic acid. The method comprises the following steps: using 1,3‑enyne and iodide as raw materials, potassium formate as a formate source, DABCO as a hydrogen transfer catalyst, Ir(bpy)2(dtbpy)PF6 as a photocatalyst, and cesium carbonate as a base, introducing CO2 under normal pressure, and obtaining an enedicarboxylic acid compound with an excellent to good yield under room temperature and visible light irradiation for 24 hours. The method has mild reaction conditions, good regioselectivity, and good functional group tolerance, and makes up for many deficiencies of the prior art.

The invention provides a method for accurately regulating and controlling the light-emitting wavelength of a mixed halide pure red light perovskite quantum dot, and belongs to the technical field of photoelectric display, and the method specifically comprises the following steps: preparing a first precursor solution based on cesium carbonate, preparing a second precursor solution based on PbI2 and ZnI2, and respectively heating; injecting oleic acid and oleylamine into the second precursor solution, heating, injecting the first precursor solution into the second precursor solution, cooling, heating again, injecting hydrobromic acid to obtain a mixed halogen perovskite quantum dot coarse solution, and centrifuging for multiple times to obtain a CsPbI3-mBrm quantum dot solution. The bromine source is introduced after the quantum dots are formed, accurate regulation and control of the light-emitting wavelength of the pure red light perovskite quantum dots are achieved, the light-emitting requirement of high-color-purity red light is met, and the quantum dots are one of ideal choices of high-efficiency photoelectric devices and display technologies in the future.

The invention relates to a preparation method of high-purity cesium carbonate, which comprises the following steps: by taking pollucite as a raw material, leaching with sulfuric acid, cooling and crystallizing to obtain crude cesium alum, recrystallizing to obtain high-purity cesium alum, adding at least one of cesium salt or cesium solution of which the cesium molar weight is greater than the aluminum molar weight in the production process in the recrystallization process, removing aluminum, converting, purifying and removing impurities, thereby obtaining the high-purity cesium carbonate. And carrying out evaporation concentration and carbonization crystallization to obtain high-purity cesium bicarbonate, and finally drying and decomposing to obtain a high-purity cesium carbonate product. Compared with a conventional method for preparing cesium carbonate through extracting cesium from pollucite and a conventional method for preparing high-purity cesium carbonate through an extraction method, the method has the advantages that the product purity is greatly improved, the content of cesium carbonate is larger than or equal to 99.999% wt in terms of Cs2CO3, the total amount of impurities including Li, Na, K, Rb, Ca, Mg, Al, Fe, SiO2 and heavy metal (in terms of Pb) is smaller than or equal to 0.001% wt, and especially the content of the same-main-group impurity Rb is smaller than or equal to 0.0001% wt.

The invention belongs to the technical field of medicines, and relates to chemical synthesis, in particular to a synthesis process of retinoic acid silane ester. The invention discloses a synthesis process of retinoic acid silane ester. The retinoic acid silane ester is prepared by carrying out nucleophilic reaction on retinoic acid and halomethyltrimethylsilane in the presence of alkali. According to the invention, the raw materials retinoic acid, chloromethane trimethylsilane and cesium carbonate are added into the solvent, the reaction temperature is controlled, after the reaction is finished, the product is obtained through post-treatment crystallization, and according to the synthesis process, the maximum product yield is about 90%.

The invention discloses a solution-treatable linear polarization low-threshold polarization laser light source and a preparation method thereof, and the preparation method comprises the following steps: mixing cesium carbonate and oleic acid, heating to 100-130 DEG C in an inert atmosphere, carrying out heat preservation for 20-40 min, after reactants are completely dissolved, heating to 140-160 DEG C, and carrying out heat preservation for 10-30 min to obtain a precursor solution A; mixing the precursor solution A, erbium acetate, yttrium acetate, bismuth acetate, silver acetate, sodium oleate, octadecene, 4-chlorobutyric acid and oleylamine according to a set proportion, standing for a set time in an inert atmosphere, stirring and heating to 90-110 DEG C, preserving heat for 0.5-1.5 h, heating to 130-150 DEG C after reactants are completely dissolved, injecting benzoyl chloride, reacting for 1-5 minutes, cooling, and stopping reaction; carrying out solid-liquid separation on the obtained mixed solution, cleaning the quantum dots, then dispersing the quantum dots in a dispersing solvent, adding PHPS into the dispersing solvent, and carrying out ultrasonic mixing; and after the PHPS is fully hydrolyzed, coating a silicon oxide sheet with the solution to prepare a film.

The invention discloses a preparation method and application of a multimode luminescent cesium yttrium chloride lead-free perovskite luminescent material. In the specific synthesis process, firstly, precursor materials-cesium carbonate, yttrium carbonate and cerium acetate are dissolved in a mixed solution of glacial acetic acid and hydrochloric acid, and a precursor solution is obtained; then dissolving a certain amount of antimony acetate with acetonitrile to form an anti-solvent solution; and finally, adding the precursor solution into the anti-solvent solution to obtain the Sb / Ce double-doped cesium yttrium chloride lead-free perovskite luminescent material. During application, the Cs3YCl6 Sb and the Cs3YCl6 Sb / Ce luminescent materials are combined for use to form a pattern, and protected information can be decrypted through a specific excitation wavelength. According to the invention, the cesium yttrium chloride lead-free perovskite luminescent material capable of realizing multimode luminescence can be prepared in a short time.

The invention discloses a method for synthesizing a pyrrole compound. The method comprises the following steps: mixing a beta-nitrostyrene compound, an alpha-fluoro-beta-ketone ester compound, cesium carbonate and ethanol, carrying out an addition reaction at 40-60 DEG C, cooling to room temperature after the reaction is finished, adding acetic acid and zinc particles, and carrying out a cyclization reaction at 60-100 DEG C to obtain the pyrrole compound. The method does not need to add a noble metal catalyst and a large number of redox agents, the reaction is carried out under normal pressure, operation is easy and convenient, raw materials are cheap and easy to obtain, and the method is suitable for large-scale production.

The invention discloses a preparation method of 2-heptanone, and belongs to the technical field of organic synthesis. The 2-heptanone is obtained by taking acetone and n-butyl alcohol as raw materials, toluene as a solvent and cesium carbonate and ruthenium acetylacetonate as catalysts, and the reaction product is separated and purified to obtain the purified 2-heptanone. The preparation method provided by the invention effectively improves the yield of 2-heptanone, and the used raw materials and reagents are environment-friendly and non-toxic; in addition, reaction conditions involved in the preparation method are mild, harsh reaction conditions are not needed, and large-scale application and popularization are facilitated.

The invention relates to a preparation method and application of surface passivation red light perovskite quantum dots, and the preparation method comprises the following steps: preparing a monovalent cation precursor from cesium carbonate, oleic acid and 1-octadecene; preparing a lead source precursor from the thiophene-sulfonamide ligand, lead halide, zinc halide, oleylamine, oleic acid and 1-octadecene; thermally injecting the monovalent cation precursor into the lead source precursor, and cooling to prepare a perovskite quantum dot solution; performing anti-solvent purification on the perovskite quantum dot solution to obtain surface passivation red light perovskite quantum dots; the invention also discloses application of the surface passivation red light perovskite quantum dot prepared by the preparation method in preparation of an electroluminescent diode. According to the invention, the purpose of preparing the halogen perovskite quantum dot with excellent optical performance, good stability and excellent performance of the prepared electroluminescent diode is achieved.

The invention relates to a preparation method of surface-passivated red-light perovskite quantum dots, which comprises the following steps: preparing an amine sulfate solution from primary amine, sulfuric acid and an organic solvent; preparing a monovalent cation precursor from at least one of cesium carbonate, methylamine and formamidine, oleic acid and 1-octadecene; preparing a lead source precursor from lead halide, zinc halide, oleylamine, oleic acid and 1-octadecene; and thermally injecting the monovalent cation precursor into the lead source precursor, cooling, and injecting an amine sulfate solution to prepare a surface passivation red light perovskite quantum dot solution. The purpose of preparing the halogen perovskite quantum dots with excellent optical performance and good stability is achieved.

The invention belongs to the technical field of organic matter preparation, and discloses 1, 3-dimethyl-2-imidazolinone and a green synthesis method thereof. The synthesis method comprises the following steps: in a carbon dioxide atmosphere, mixing methanol with a catalyst, reacting to obtain dimethyl carbonate, mixing cesium carbonate, ethylenediamine and methanol, introducing carbon dioxide, reacting to obtain 2-imidazolidinone, and reacting dimethyl carbonate, 2-imidazolidinone and the catalyst to obtain 1, 3-dimethyl-2-imidazolidinone. The raw materials in the whole technological process are in closed circulation, circular economy is achieved to the maximum extent, and the method is a green and environment-friendly synthesis process.

The invention relates to a double-coordination passivated red-light perovskite quantum dot and a preparation method and application thereof. The preparation method comprises the following steps: preparing a monovalent cation precursor from cesium carbonate, 1-octadecene and oleic acid; preparing a lead source precursor from lead halide, zinc halide, 1-octadecene, diisooctyl hypophosphorous acid and oleylamine; thermally injecting the monovalent cation precursor into the lead source precursor, and cooling to prepare a perovskite quantum dot solution; performing anti-solvent purification on the perovskite quantum dot solution to obtain red light perovskite quantum dots; a process of preparing a double-coordination passivated red light perovskite quantum dot from the red light perovskite quantum dot and taurosulfonamide hydrochloride; the invention also discloses an application of the double-coordination passivated red light perovskite quantum dot prepared by the preparation method in preparation of an electroluminescent diode. The post-treatment passivation operation method is simple and convenient, and the quantum dot treated by the double-coordination ligand achieves the purpose of preparing the halide perovskite quantum dot with excellent optical performance and excellent performance of the prepared electroluminescent diode.

The present invention discloses a photocatalyst for the regeneration of coenzyme NADH and a preparation method thereof, wherein the photocatalyst is a donor-π-acceptor type conjugated organic polymer, with a triazine-based ligand as an acceptor unit and a heterocyclic ligand as a donor unit, wherein the molar ratio of the triazine-based ligand to the heterocyclic ligand is 1:(1-2), the triazine-based ligand raw material selects 2,4,6-trimethyl-1,3,5-triazine, and the heterocyclic ligand raw material selects a heterocyclic diformaldehyde containing a furan or thiophene structure. The photocatalyst is prepared by a solvothermal method through a Knoevenagel aldol condensation reaction, the reaction solvent selects a mixed solvent of n-butanol and o-dichlorobenzene or a mixed solvent of mesitylene and 1,4-dioxane, and the catalyst used in the reaction selects at least one of trifluoroacetic acid, potassium hydroxide, 1,8-diazabicycloundecane-7-ene, sodium hydroxide, and cesium carbonate. The developed photocatalyst has a donor-π-acceptor type conjugated structure, and has high catalytic activity, high selectivity, good stability, and easy separation and recovery for the regeneration of coenzyme NADH.

The invention discloses a chiral hydrosilane compound as well as a preparation method and application thereof. The structural formula of the chiral hydrosilane compound is shown as a formula (I). The chiral hydrosilane compound can be prepared by two methods, one method comprises the following steps: synthesizing tert-butyldihydrosilane from cheap and easily available phenyl silane through a Grignard reagent reaction, adding a ligand and hexamethyldisilylamino potassium to react with benzyl alcohol in a copper tetracyano hexafluorophosphonate catalysis manner, and carrying out reduced pressure distillation to obtain the chiral hydrosilane compound. And finally, synthesizing a hydrogen silane compound with chirality. And the other method comprises the step of adding a brominated compound and cesium carbonate in a copper metal catalysis process to generate the chiral hydrosilane compound. According to the invention, the range of the product is widened to a great extent, and a foundation is laid for subsequent application and transformation. # imgabs0 #

The invention discloses a catalyst for synthesizing 1, 3-dioxane-2-ketone as well as a preparation method and application of the catalyst. The catalyst is prepared from the following components in percentage by mass: 60wt%-90wt% of a component A, 5wt%-20wt% of a component B and 5wt%-30wt% of a component C, wherein the component A is one or more of N, N-dimethyl formamide, N, N-dimethylacetamide, N, N-diethyl formamide and urea, and the component B is one or more of N, N-dimethyl formamide, N, N-dimethylacetamide, N, N-diethyl formamide and urea; the component B is one or more of lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate, calcium carbonate and magnesium carbonate; and the component C is 1-butyl-3-methylimidazolium tetrafluoroborate and / or 1-butyl-3-methylimidazolium hexafluorophosphate, and the component C is 1-butyl-3-methylimidazolium hexafluorophosphate. According to the present invention, the components of the catalyst have the mutual synergistic promotion effect, the reaction substrate can be adsorbed and activated, the reaction condition is mild, the product yield is high, the catalyst can be recovered and regenerated, and the environmental pollution is low.

The invention belongs to the technical field of radioactive waste treatment, and discloses a ceramic solidified body for synergistically solidifying radioactive iodine and cesium as well as a preparation method and application of the ceramic solidified body. The chemical formula of the ceramic solidified body is (Cs2xBa2-2x) (AgyNa1-y) IO6, x is equal to 0.1-0.9, y is equal to 0.1-0.9, and the ceramic solidified body is prepared by mixing silver iodide, barium hydroxide, sodium periodate and cesium carbonate, carrying out dry pressing molding under 20-60 MPa to obtain a rough blank, sintering at 500-700 DEG C, carrying out cold sintering at 200-300 DEG C, and finally annealing at 500-600 DEG C. The curing amount of iodine in the ceramic cured body is 2.4-20 wt%, the curing amount of cesium is 4-46 wt%, and the ceramic cured body has excellent chemical stability and is suitable for curing radioactive iodine and cesium and long-term geological treatment.

The invention discloses a strontium chloride-assisted method for improving the fluorescence quantum yield of manganese-doped CsPbCl3 quantum dots, which comprises the following steps: adding cesium carbonate into octadecene, heating and stirring until uniform mixing, and injecting oleic acid to obtain a cesium oleate solution; the preparation method comprises the following steps: adding different amounts of strontium chloride auxiliary dopant, manganese chloride dopant, lead chloride, oleylamine and oleic acid into octadecene, heating and stirring to uniformly mix to obtain a precursor mixed solution; injecting the cesium oleate solution into the precursor mixed solution, reacting for a certain period of time, and cooling in ice water to room temperature to form a CsPbCl3 quantum dot stock solution; a certain proportion of a flocculating agent is added into the stock solution, and a CsPbCl3 quantum dot solution is obtained through centrifugal treatment. According to the preparation method disclosed by the invention, the quantum yield of Mn-emitted fluorescence of the Mn-doped CsPbCl3 quantum dot is improved by regulating and controlling the addition amount of the doping agent, and finally, the quantum yield of Mn-emitted fluorescence of the Sr and Mn co-doped CsPbCl3 quantum dot reaches up to 100%.

The invention discloses an alpha-dideuterium methylated sulfone compound as well as a synthesis method and application thereof, and belongs to the field of organic chemistry. In an air atmosphere, benzyl methyl sulfone and 2-((3, 5-dimethyl-4-methoxypyridine-2-yl) methylsulfonyl)-5-methoxy-1H-benzo [d] imidazole are used as substrates, in the presence of a catalyst [Cp * IrCl2] 2 and cesium carbonate, deuterated paraformaldehyde is used as a carbon source, sodium formate is used as an additive, and the alpha-dideuterium methylated sulfone compound is obtained through a reaction in an acetonitrile solvent at 120 DEG C. The reaction does not need to use a ligand and hydrogen, the reaction is simple and efficient, the potential value of the compound in medicinal chemistry is shown, and the compound has a certain inhibition effect on H3N2 subtype influenza viruses and has remarkable application potential.

This invention discloses an organic liquid energy storage carrier and its application, relating to the field of liquid organic hydrogen carrier technology. The organic liquid energy storage carrier of this invention is any one of p-fluorotoluene, m-fluorotoluene, o-fluorotoluene, and fluoromethylbenzene. The application method of this organic liquid energy storage carrier is as follows: 4Å molecular sieve, Rh catalyst, cesium carbonate, and the organic liquid energy storage carrier are sequentially added to a high-pressure reactor, and the reactor is sealed before hydrogen gas is introduced. Following this, microwave plasma pretreatment is performed, and then hydrogen gas is introduced until the pressure inside the reactor reaches 50 bar, followed by a hydrogenation reaction. After cooling, post-processing is performed to obtain the energy storage carrier. The organic liquid energy storage carrier of this invention not only possesses excellent safety and extremely low toxicity, but its application method also reduces reaction energy consumption and increases yield. Therefore, this invention has broader application prospects.

The present invention discloses a preparation method of a terpyridine functional chain extender. The terpyridine functional chain extender is a terpyridine functional chain extender capped with dihydroxy groups. The preparation method is as follows: Under an anhydrous and anaerobic environment, 4'-bromo-2,2':6,2'-terpyridine and triethanolamine are mixed, and then cuprous iodide and cesium carbonate are added as catalysts. The reaction is carried out under reflux in a sealed environment, cooled to room temperature, the organic phase is extracted, and purified by column chromatography. At the same time, the present invention also discloses the application of the terpyridine functional chain extender in the preparation of a self-healing conductive polyurethane elastomer. When preparing the self-healing conductive polyurethane elastomer of the present invention, no solvent is required, pollution is reduced, and a polyurethane material with good conductivity, mechanical properties and room temperature self-healing properties can be prepared.

The application provides a kind of spectral analysis device and medical cesium carbonate preparation method, it is related to spectral detection technical field, including analyzer, analysis mechanism and bearing mechanism;The top of the analyzer is rotatably connected with the cover plate, the inside of the analyzer is fixedly provided with the mounting plate, and the outer wall of the mounting plate and inside the analyzer is fixedly provided with the side plate;The analysis mechanism includes the mounting sleeve fixedly arranged in the inside of the side plate, the top of the mounting sleeve is provided with the sealing plate, the inside of the mounting sleeve is slidably connected with the spring rod, and the inside of the mounting sleeve and the bottom end of the spring rod are fixedly provided with the lifting frame.The scheme can automatically explore the infrared generator during the process of turning over and closing the cover plate, and the two turning plates are synchronously turned to form an avoidance during the exploring process, so that the emission end of the infrared generator can be protected from being covered by external factors based on protection, which can effectively improve the spectral detection accuracy, and the infrared generator can be well protected to further improve the spectral detection accuracy.

The invention provides a high-purity spherical cesium iodide preparation method, which comprises: S1, dissolving cesium carbonate in pure water to obtain a cesium carbonate solution, carrying out a reaction on the cesium carbonate solution, hydrazine hydrate and an iodine simple substance, and carrying out solid-liquid separation to obtain a cesium iodide solution; s2, evaporating and concentrating the cesium iodide solution to a saturated state, cooling to room temperature by program temperature control, separating out cesium iodide, and then carrying out solid-liquid separation to obtain a cesium iodide wet material; s3, drying the cesium iodide wet material to obtain a first batch of cesium iodide; s4, washing the first batch of cesium iodide, and then carrying out solid-liquid separation to obtain a second batch of cesium iodide; s5, the second batch of cesium iodide is redissolved, an organic dispersing agent is added into the solution, evaporative crystallization is conducted under the stirring condition, then solid-liquid separation is conducted, and finally the high-purity spherical cesium iodide product is obtained.The technology is simple, operability is high, energy consumption is low, and large-scale production can be achieved.

The present disclosure broadly relates to a high temperature chemical process for the synthesis of cesium tungstate in the solid state and the preparation of aqueous solutions or deuterated solutions of cesium tungstate. More specifically, but not exclusively, the present disclosure relates to a high temperature chemical process in which tungsten oxide compounds such as tungsten oxides, or natural or synthetic concentrates such as wolframite or scheelite, tungsten industrial by-products or there mixture thereof, are mixed with cesium compounds such as cesium carbonate, or cesium sulfate, or cesium hydroxide or their mixtures thereof and the mixture is roasted in air or oxygen at high temperature inside a kiln. After cooling, the solid sintered mass containing cesium tungstate is leached or dissolved with water or heavy water for producing dense aqueous solutions or deuterated solutions of cesium tungstate.

The invention discloses a nuclear magnetic resonance imaging contrast agent GH-Gd as well as a preparation method and application thereof, and belongs to the multidisciplinary crossing fields of material science, kidney pathology, medical imaging and the like. The structure of the contrast agent GH-Gd is shown in the following formula, and the preparation method of the contrast agent GH-Gd comprises the following steps: adding a compound H-DOTA, GGT-1 and cesium carbonate into anhydrous acetonitrile, and carrying out heating reflux reaction to obtain a compound GH-DOTA; and carrying out chelation reaction on the compound GH-DOTA and gadolinium chloride to obtain the nuclear magnetic resonance imaging contrast agent GH-Gd. The contrast agent GH-Gd is formed by chelating a ligand GH-DOTA with Gd < 3 + >, the contrast agent sequentially plays three functions of kidney integration glomerular filtration, GGT and MPO programmed activated kidney enrichment and enzymatic hydrolysis kidney clearance, and the content and dynamic distribution information of GGT and MPO can be obtained while kidney injury is avoided. # imgabs0 #

The invention discloses a method for recovering lithium, rubidium and cesium from lithium ore, and belongs to the technical field of lithium ore recovery. The method for recovering the lithium, the rubidium and the cesium from the lithium ore comprises the following steps: carrying out primary roasting on the lithium ore to obtain a primary roasting product, then mixing the primary roasting product with sulfuric acid, carrying out secondary roasting to obtain a secondary roasting product, and carrying out water leaching to obtain a solution containing the lithium, the rubidium and the cesium; adding a lithium extraction agent into the solution containing lithium, rubidium and cesium, carrying out lithium extraction to obtain a lithium extraction solution and a raffinate 1, and carrying out lithium reverse extraction and pyrolysis to obtain lithium carbonate; adding a cesium extraction agent into the raffinate 1, carrying out cesium extraction to obtain cesium extraction liquid and raffinate 2, and carrying out cesium reverse extraction and pyrolysis to obtain cesium carbonate; adding a cesium extraction agent into the raffinate 2, and carrying out cesium secondary extraction to obtain cesium secondary extraction liquid and raffinate 3; and adding a rubidium extraction agent into the raffinate 3, and carrying out rubidium extraction, rubidium reverse extraction and pyrolysis to obtain rubidium carbonate.

The invention discloses a preparation method of efficient luminous Sr < 2 + > doped CsPbX3 quantum dots. The preparation method comprises the following steps: weighing oleic acid, oleylamine, 1-octadecene and cesium carbonate, mixing, stirring and heating to obtain a cesium oleate solution; weighing lead halide, strontium halide, oleic acid, oleylamine and 1-octadecene, heating and stirring to obtain a precursor solution; rapidly injecting a cesium oleate solution into the precursor solution at a high temperature, reacting for a certain time, placing a reaction container in ice water, and cooling to room temperature to obtain a Sr < 2 + > doped quantum dot stock solution; adding a flocculating agent into the Sr < 2 + >-doped quantum dot stock solution, uniformly mixing, centrifuging in a centrifugal machine, dispersing the obtained precipitate in toluene, adding a toluene solution of OAmX, then adding the flocculating agent, uniformly mixing, performing secondary centrifugation, and dispersing the obtained precipitate in a dispersing agent to obtain the efficient light-emitting Sr < 2 + >-doped CsPbX3 quantum dot solution. The content of Pb in the CsPbX3 quantum dot is reduced through doping of Sr < 2 + >, the toxicity of the material is reduced, and the method has the advantages of being environmentally friendly, simple, controllable and easy to operate.

The present invention discloses a method for preparing an α-arylimino aryl acetonitrile derivative, comprising the following steps: (1) using ethanol as a solvent, mixing an aromatic aldehyde and an aromatic amine to react to generate a Schiff base compound; (2) using cesium carbonate as a base, anhydrous N,N-dimethylformamide as a solvent, and malononitrile as a cyanogen source to mix with the Schiff base compound generated in step (1), heating to 90-100° C., and reacting for 7-8 hours to obtain an α-arylimino aryl acetonitrile derivative. The method synthesizes a target compound by reacting aromatic aldehyde, aromatic amine, and malononitrile under the action of cesium carbonate. The method has the advantages of simple reaction steps, using a green cyanogen source malononitrile, avoiding the use of highly toxic reagents such as potassium cyanide and trimethylsilyl cyanide, convenient post-processing, high product regioselectivity, and being able to effectively construct the basic skeleton of the α-arylimino aryl acetonitrile.