10 results about "Formamidine acetate" patented technology

The invention provides a method for preparing formamidine hydriodate through a one-pot method, formamidine hydriodate and application of formamidine hydriodate, and particularly relates to the technical field of perovskite photovoltaic cell precursor material preparation. The method comprises the following steps: adding an iodine elementary substance and a solvent into a reaction container, dropwise adding a reducing agent to carry out a first reaction, adding formamidine acetate in batches to carry out a second reaction at 0-10 DEG C after the reaction is completed, and carrying out post-treatment purification after the reaction is completed to obtain the formamidine hydriodate. The method directly selects the iodine elementary substance as the raw material, so that the use cost of the raw material is effectively reduced; one-pot integrated reaction is adopted in the preparation process, intermediate separation is not needed, the opportunity that metal impurities are introduced due to multiple transfer and purification operations in a traditional method is reduced, and the content of the metal impurities in the product can be reduced; distillation and other steps with high energy consumption and long time consumption are omitted, so that the reaction period is shortened, and the energy consumption is reduced.

The application relates to a preparation method of 4-chloropyrrolopyrimidine, in particular to a four-step high-yield synthesis of 4-chloropyrrolopyrimidine by taking diethyl malonate and bromoacetaldehyde diethyl acetal as raw materials, through substitution reaction, then ring closure reaction with formamidine acetate, ring closure reaction under acidic conditions, and then chlorination reaction with phosphorus oxychloride; the preparation method of 4-chloropyrrolopyrimidine provided by the synthesis route is a preparation method with high yield, low cost, easy operation and suitability for industrialization.

The invention relates to a synthesis method of a perovskite microcrystalline material, and belongs to the field of perovskite materials. The invention provides a synthesis method of a perovskite microcrystalline material, which comprises the following steps: mixing alkali metal iodide salt, lead acetate trihydrate and formamidine acetate, and reacting under preset conditions to obtain the formamidine lead iodide perovskite microcrystalline material. According to the method, an acid-free system is adopted for synthesizing the formamidine lead iodide perovskite microcrystal material for the first time, hydroiodic acid which is indispensable and extremely high in danger coefficient in a traditional aqueous phase method is completely abandoned, alkali metal iodide salt is creatively adopted as a green iodine source, high-quality formamidine lead iodide perovskite microcrystals are successfully synthesized, the material performance is guaranteed, and meanwhile the yield of the formamidine lead iodide perovskite microcrystals is increased. The safety of the synthesis process is greatly improved; in addition, the solid salt with stable properties is adopted, so that the sensitivity of the whole synthesis process to air and humidity is reduced, and better repeatability and stability are achieved.

The invention relates to the technical field of nano material preparation, and discloses formamidine acetate doped CsPbBr3 perovskite nanocrystals and a water phase preparation method thereof.The method comprises the steps that firstly, lead bromide, cesium bromide, formamidine acetate and dimethylacetamide are mixed, and a uniformly-doped precursor solution containing formamidine acetate is prepared under the ultrasonic concussion condition; sequentially adding oleylamine and 5-bromovaleric acid into the precursor solution according to a specific sequence, and carrying out ultrasonic-assisted in-situ surface ligand modification; and finally, rapidly injecting the precursor solution into deionized water, inducing crystallization by using the polarity difference of the solvent, centrifuging to remove the precipitate, and taking the supernatant to obtain the target product. According to the preparation method disclosed by the invention, the structural stability of the CsPbBr3 nanocrystal is remarkably improved through doping of formamidine acetate (FA) to a lattice A site and synergistic coordination of acetate. The obtained nanocrystal has a cubic crystal phase structure and can be stably dispersed in a water phase system, and the technical problem that a traditional perovskite material is easy to decompose when meeting water is solved.

The invention discloses a tin-lead perovskite solar cell prepared based on an organic amine salt crystallization regulation strategy and a preparation method of the tin-lead perovskite solar cell. According to the method, formamidine acetate and guanidine thiocyanate are used as crystallization control agents, and the smooth, compact and uniform tin-lead perovskite thin film can be obtained through a one-step anti-solvent-free spin-coating method and heat treatment in the nitrogen atmosphere. Wherein formamidine acetate can realize one-step spin coating by delaying a crystallization process; and guanidine thiocyanate can form a two-dimensional phase at the grain boundary to passivate defects at the grain boundary, reduce the defect state density, reduce non-radiative recombination and improve the stability of the perovskite thin film. Compared with a traditional anti-solvent dripping process, the preparation method disclosed by the invention has the characteristics of simplicity, rapidness, high efficiency and high repeatability.

The invention discloses a green synthesis method of perovskite crystal powder. The preparation method comprises the following specific steps: mixing methylamine, formamidine acetate or cesium acetate as a raw material with HX according to a molar ratio of 1: (1-1.8), and reacting for 2-8 hours to generate AX molecules, X being selected from Cl <->, Br <-> or I <->; purifying the AX molecules by recrystallization; in cyclopentyl methyl ether, AX molecules and BX2 molecules are mixed to react, B is selected from Pb < 2 + > or Sn < 2 + >, and the molar ratio of the AX molecules to the BX2 molecules is (1-1.8): 1; and precipitating an ABX3 product by using ethyl acetate as an anti-solvent, and drying at 70-95 DEG C for 18-24 hours. According to the synthesis method, the pollution risk of a toxic solvent to air, soil and water resources is remarkably reduced, the high environment-friendly characteristic is reflected, and meanwhile sustainable utilization of resources is promoted.

Disclosed in the present invention is a method for regulating and controlling a phase of aqueous synthetic formamidine lead iodine perovskite powder, for use in synthesizing pure α-phase and δ-phase perovskite powder. The method comprises the following steps: first dissolving a lead source in an aqueous acetic acid solution, then adding formamidine acetate, stirring to obtain a clear and transparent solution, adding hydroiodic acid to obtain a large amount of precipitate, filtering and collecting the precipitate, using a detergent to wash the precipitate, then collecting a solid product, placing the solid product in a drying oven, and drying to obtain the perovskite powder. The pure α-phase and δ-phase perovskite powder can be obtained by controlling the type of a washing solvent and a drying temperature.

The invention provides an improved preparation method of formamidine acetate, and belongs to the technical field of fine chemical engineering. According to the preparation method, formamide, acetic acid and ammonia gas are taken as reaction raw materials, and formamidine acetate can be efficiently prepared through one-step reaction in the presence of a dehydrating agent and a catalyst. Different from a traditional process, the technical core of the method is that formamide is innovatively selected as a starting raw material, and the reaction path is remarkably simplified. Compared with the problems of long multi-step reaction process, high safety risk and the like in the prior art, the method disclosed by the invention is mild in reaction condition, simple and convenient to operate and high in product yield, and has good industrial application potential.

Disclosed in the present invention is a method for synthesizing a 4-chloropyrrolopyrimidine compound or a derivative thereof, comprising the following steps: reacting an alkylene oxide compound with a cyanoacetate compound by taking an alkaline substance as a catalyst to generate intermediate 1, and further carrying out ring closure to obtain intermediate 2; by taking an alkaline substance as a catalyst, reacting a formamidine acetate compound with intermediates 1 and 2 by using a one-pot method to obtain a 6-amino-5-(2-hydroxyethyl)pyrimidin-4-ol compound; further by using the one-pot method, using an oxidizing agent to oxidize the 6-amino-5-(2-hydroxyethyl)pyrimidin-4-ol compound into an aldehyde compound, and then further carrying out ring closure to obtain a 4-hydroxypyrrolopyrimidine compound; and adding an organic alkali for a chlorination reaction between the 4-hydroxypyrrolopyrimidine compound and phosphorus oxychloride to obtain the 4-chloropyrrolopyrimidine compound. In the present invention, the 4-chloropyrrolopyrimidine compound is synthesized by using a novel synthesis strategy, and the synthesis has a simple operation, cost effective raw materials, and a relatively high yield and is suitable for large-scale production in factories.

This invention relates to the field of perovskite solar cells, specifically a method for preparing high-purity formamidinium hydroiodate, comprising the following steps: dissolving formamidinium acetate in hydroiodic acid solution and stirring to obtain a precursor solution of formamidinium hydroiodate; heating the solution in an oil bath to obtain a crude product of formamidinium hydroiodate; cooling the product and adding an ethanol solution, then heating again until completely dissolved to obtain a hot saturated solution; removing the hot solution and vacuum filtering, and pouring the resulting mother liquor into a crystallizing dish for crystallization; after crystallization, adding diethyl ether for washing; placing the washed flaky crystals in an oil bath and adding ethanol again for heating to dissolve, then filtering, and pouring the resulting mother liquor back into a crystallizing dish for low-temperature crystallization; repeating the above steps three times; and vacuum drying the obtained product to obtain formamidinium hydroiodate, which is the target product. The formamidinium hydroiodate of this invention, when applied to a perovskite layer, can greatly improve the photovoltaic performance of perovskite solar cells and significantly improve the stability of the device.