43 results about "Lone electron pair" patented technology

The invention provides carbon quantum dots with room-temperature phosphorescence and delayed fluorescence properties. The carbon quantum dots can generate fluorescence under the excitation of ultraviolet light with the wavelength of 315-475nm, wherein the fluorescence intensity reaches the maximum when the excitation wavelength is 375nm. The particle size distribution range of the carbon quantum dots is 2-6nm. The brand-new carbon quantum dots with room-temperature phosphorescence and delayed fluorescence properties are synthesized from isocyanate under the action of microwaves. The carbon quantum dots have high yield, are oil-soluble, and can be compounded into a polymer material in situ without aggregation. The structure of the carbon quantum dots contains certain amounts of O, N and other heteroatoms with lone electron pairs, thereby increasing the transition probability from singlet state to triplet state under excitation. Meanwhile, the matrix performs the functions of reducing the nonradiative transition and quenching the triplet-state oxygen, so that the prepared carbon quantum dots have the visible stable room-temperature phosphorescence and delayed fluorescence properties in the matrix.

The object of the invention is to provide a thermosetting resin composition which, in packaging an electronic circuit containing components incapable of withstanding elevated temperatures, employs low-melting solder particles, thereby enabling batch ref lowing and enabling packaging of components with excellent strength and toughness.

The invention relates to a thermosetting resin composition which includes a metal filler component, a fluxing component and a thermosetting resin binder. The metal filler component includes at least one of bismuth (Bi) and indium (In), and tin (Sn). The fluxing component, which at least one of a compound of structural formula (1) below and a compound of structural formula (2) below, is used.

In the above formulas, R₁ to R₆ are each a hydrogen or alkyl group, and X is an organic group which has a lone electron pair or double bond π electrons and is capable of coordinating with a metal.

The invention discloses a method for preparing an absorbing material based on modified konjac glucomannan. The method is characterized by comprising the following steps of: soaking konjac glucomannan in mixed solution of an organic small molecular swelling solvent and water, swelling for 2 to 24 hours, performing vacuum filtration, and washing a solid by using an organic small molecular solvent to remove residual moisture; and adding the swollen konjac glucomannan into a heterocyclic or aromatic derivative which is dissolved by the organic small molecular solvent and has lone electron pairs or/and free electrons, stirring and reacting for 1 to 72 hours in the presence of a catalyst at the temperature of between 50 and 120 DEG C, precipitating a material obtained after the reaction by using a precipitation solvent, filtering, and washing and drying a solid to obtain modified konjac glucomannan powder. In the method, the modified konjac glucomannan has the characteristic of absorbing heavy metal ions; and the absorbing material can be widely used for treating heavy metal ions, radioactive nuclide wastewater and the like produced by mining industry, chemical industry, nuclear industry and the like.

The invention discloses a high-stability lithium ion battery electrolyte which comprises lithium hexafluorophosphate, a nonaqueous solvent, an additive and an electrolyte stabilizing agent, wherein the electrolyte stabilizing agent is any one and more of tris(trimethylsilyl)phosphite, N, N-dimethylpropionamide and N-methyl-2-pyrrolidone. According to the invention, as P/N atoms in the electrolyte stabilizing agent have lone electron pairs, relatively low Lewis base property is achieved after a less amount of the electrolyte stabilizing agent is added into the electrolyte, the electrolyte stabilizing agent and PF5 can form a complex of six ligands, and accordingly the Lewis acidity and reaction activity of the PF5 are reduced and the colority rising caused by the reaction between the PF5 and trace impurities in the electrolyte is inhibited well; in addition, the stabilizing agent has good compatibility with a graphite cathode, and can react on the electrode surface after being added into the electrolyte to form a film, so that the cycle performance of the lithium ion battery is improved.

An electrolyte composition and a solar cell using the same are provided. The electrolyte composition comprises an electron donor compound “A” having a lone electron pair, an iodine salt. and iodine (I₂). The electrolyte composition according to the present invention increases electrons in a porous film to improve a charge integration capacity and increases the open circuit voltage, thereby providing a dye sensitized solar cell with high efficiency.

There is provided an electrolyte material for a fuel cell having a high proton conductivity even in a state without humidification or moisture. The object is achieved by the electrolyte material for a fuel cell having a proton conductive system at least comprising (a) a Brönsted acid and (b) a base having a lone electron-pair, wherein the base (b) has a structure in which one or more groups are added to a group having the lone electron-pair, and a total number of constitutional atoms other than H atom included in all the added group is three or less.

A functional device comprising a semiconductor material, wherein the functional device contains a compound not substantially undergoing oxidation-reduction reaction but having at least one lone electron pair and in which adding the compound negatively changes a flat band potential of the semiconductor material with respect to a case not adding it.

The invention provides an ethylene propylene diene monomer, and a preparation method thereof. The ethylene propylene diene monomer is prepared from an ethylene propylene diene monomer crude rubber, sulphur, zinc oxide, a functional filling material, a fire retardant, a accelerant, and an antioxidant. According to the preparation method, nanometer calcium carbonate particles coated with a polyionic liquid are taken as the functional filling material; on one hand, nanometer calcium carbonate is modified by the polyionic liquid, the bonding force between calcium carbonate and a rubber matrix is improved, and the mechanical properties of the ethylene propylene diene monomer are improved, and on the other hand, xanthogenic acid is used for providing the negative ions in the ethylene propylene diene monomer, the oxygen atoms can be used for providing lone electron pairs, synergistic activation of S8 rings of sulphur is realized by xanthogenic acid and the accelerant, the crosslinking time of rubber macromolecular radicals with rubber molecular chains is promoted, and sulfuration time is shortened. The high performance is green, is friendly to the environment, and possesses flame resistance; rapid sulfuration is realized; compression deformation is low; heat aging resistance is excellent; the preparation method is simple; operation is convenient; and the preparation method is suitable for industrialized production.

The invention discloses a special catalyst for preparing para-Phthalonitrile by using an ammoxidation method. Silica sol is adopted as a carrier of the special catalyst, the catalyst comprises an active component of an inorganic composite oxide with at least six of vanadium, molybdenum, chromium, boron, titanium, phosphorus, antimony and an alkali metal, the active component of the catalyst is shown in a formula VMoaCrbTicBdPeSbfMgOx, in the formula, x represents the alkali metal, and the alkali metal is sodium, potassium, rubidium or caesium. The invention furthermore discloses a preparationmethod and application of the catalyst. According to the catalyst, groups with lone electron pairs on silicon and inorganic elements are subjected to a Lewis acid-alkali reaction, so that functions ofinorganic oxides with carriers are enhanced; and meanwhile, the inorganic oxides can be uniformly dispersed, the catalyst is small in component loss, high in catalytic activity and good in selectivity, and the service life of the industrial catalyst is prolonged to two years or longer from one year. The catalyst is simple in preparation method, good in thermal stability and high in mechanical strength, and can be applied to fixed bed reactors and fluidized bed reactors.

The invention discloses a treatment method for gold nanoparticles protected by an organic functional group. According to the method, a stabilizer ligand on the surface of the gold nanoparticles can be easily and efficiently treated, so as to supply unsaturated ligating atoms and improve the catalysis activity of the gold nanoparticles. The method mainly comprises: adding Lewis acid into the gold nanoparticles, supplying a lone electron pair under the synergistic action of alkali, and treating the stabilizer ligand on the gold surface at room temperature. Changes of an absorption peak due to the addition of the Lewis acid can be intuitively observed in an ultraviolet-visible absorption spectrum chart, and the changes are matched with results on a mass spectrum.

The invention discloses a bulky electron-rich phosphine ligand compound and a preparation method thereof. The structural formula of the phosphine ligand is shown in formula I; wherein, R represents an alkyl group, an alkenyl group, an alkynyl group, an alkoxy group or an aryl group substituted by an alkane. The method for preparing the compound of formula I comprises the following steps: reacting the compound shown in formula II with the compound shown in formula III at -90°C to -60°C for 2-5h, and then reacting at room temperature for 5-15 hours, namely have to. The lone electron pair on the methoxyl oxygen in the large-volume thiophene-containing ligand synthesized by the present invention can increase the electron cloud density of the molecule, which is beneficial to stabilizing the Pd intermediate in the reaction process, preventing cyclization, and increasing steric hindrance. Improve catalyst life. In addition, the thiophene ring is a group with a stronger electron supply than aryl or alkyl, which is beneficial to increase the electron cloud density on the phosphine and improve the activity of the ligand. The ligand of the present invention is coordinated with the palladium catalyst and then applied to Suzuki coupling or polymerization reaction to synthesize photoelectric polymer materials with high molecular weight and high yield.

The invention discloses a preparation method of an adsorption material based on modified konjac glucomannan. The method is characterized by: soaking konjac glucomannan in a mixed solution of an organic small molecule swelling solvent and water, conducting swelling for 2-24h, then conducting vacuum pumping and filtration, washing solids with the organic small molecule solvent to remove residual water; and adding the swollen konjac glucomannan into an organic small molecule solvent dissovled heterocycle or aromatic derivative with lone electron pair or/or free electrons, in the presence of a catalyst, carrying out stirring reaction at 50DEG C-120DEG C for 1-72h, then precipitating the reacted material with a precipitation solvent, then conducting filtering, and washing and drying the solid,thus obtaining the modified konjac glucomannan powder. According to the invention, modified konjac glucomannan has the characteristic of adsorbing heavy metal ions, and can be widely applied to treatment of heavy metal ion and radionuclide wastewater and the like produced by mining industry, chemical industry, nuclear industry, etc.

A method for making a copper indium chalcogenides powder, includes: (a) reacting a reactant mixture that contains a Cu-containing material, an In-containing material, and a chalcogenides-containing material in a polar organic solvent at an elevated temperature so as to form a precipitate, the polar organic solvent having a molecular structure containing at least one of nitrogen atom and oxygen atom, each of which having at least one lone electron pair, the polar organic solvent further having a dipole moment greater than 2.3 debye; and (b) separating the polar organic solvent from the precipitate.

The invention relates to an electronic device comprising a compound having Formula (1): AB_x (1), wherein A is a structural moiety that consists of at least two atoms and comprises a conjugated system of delocalized electrons, each B is independently selected from an imine functional group (1a), wherein R¹, R², R³, R⁴ are independently selected from C₁-C₃₀ alkyl, C₂-C₃₀ alkenyl, C₂-C₃ alkinyl, C₃-C₃₀ cycloalkyl, C₆-C₃₀ aryl, C₂-C₃₀ heteroaryl, C₇-C₃₀ arylalkyl, C₃-C₃₀ heteroarylalkyl, the wave line represents a covalent bond to the imine nitrogen atom, G is in each group (1a) independently selected from a quarternary carbon atom and from a cyclopropenylidene structural moiety, x is an integer equal one or higher, preferably equal two or higher, and the lone electron pair of the imine nitrogen atom and/or the pi-electrons of the imine double bond of at least one group B is conjugated with the conjugated system of delocalized electrons comprised in the structural moiety A, with the proviso that two or more of the substituents R¹, R², R³, R⁴ may be connected to form a ring that may contain also unsaturation and, if any of the substituents R¹, R², R³, R⁴ comprises two or more carbon atoms, up to one third of the overall count of the carbon atoms in the substituent or in any ring formed by two connected substituents can be replaced with heteroatoms independently selected from O, S, N and B as well as to an electrically semiconducting material and a compound for use in the electronic device.

The invention provides bis(2-phthalimide)amine and a preparation method thereof. The method includes: step 1, heating a mixed system composed of diethylenetriamine, phthalic anhydride and glacial acetic acid to 90-100DEG C to obtain a mixed system A; step 2, heating the mixed system A to 115-130DEG C, then carrying out reaction for 1-4h, adding toluene continuously in the heating process to obtaina mixed system B; and step 3, sequentially removing glacial acetic acid and impurities from the mixed system B to obtain a product, and washing and drying the product in order to obtain bis(2-phthalimide)amine. Part of positive charges carried by carbonyl on phthalic anhydride interact with lone electron pairs on N atoms of diethylenetriamine primary amine to form a transition complex, and then amic acid can be formed, and finally the temperature is raised, acid in amic acid molecules and another H atom in the primary amine are subjected to high-temperature removal of one water molecule so asto form a final imide structure, and the yield and purity of the product are high.

The invention discloses a one-step synthesis method of 2 '3'-dideoxynucleoside. The method comprises the following steps: directly reacting alkaloid (I) and saturated ether R4OCH2R5 at a certain temperature under the action of a catalyst and an oxidizing agent to synthesize 2 '3'-dideoxynucleoside in one step; according to the synthesis method, ether can be converted into a highly electrophilic carbonyl ylide intermediate under the combined action of a catalyst, a ligand and an oxidizing agent, and alkaloid (I) has better nucleophilic reaction activity due to lone electron pairs on nitrogen atoms, can attack the electrophilic carbonyl ylide intermediate generated in situ in the reaction, and can be used for preparing a high-purity carbonyl ylide intermediate. The 2 '3'-dideoxynucleoside and the 2 '3'-dideoxynucleoside are combined to react to generate a final 2 '3'-dideoxynucleoside product, and reaction byproducts only comprise water and tert-butyl alcohol, so that the environment is not polluted.