49 results about "Protonation" patented technology

The application discloses application of 2-amino isophthalic acid (2-AIA) as a MALDI matrix in characterization of oligosaccharide additives in food. The skeleton structure of 2-AIA has a strong ultraviolet absorption group and a protonation site, which is beneficial to laser energy transmission and desorption ionization process of the measured object. Meanwhile, 2-AIA has multiple polar functional groups, which can effectively enhance the directional combination of the hydroxyl group of 2-AIA and oligosaccharide, and improve the anti-interference ability of impurities in a complex system. In addition, 2-AIA and a traditional organic matrix alpha-cyano-4-hydroxycinnamic acid (CHCA) are combined as a binary matrix (CHCA / 2-AIA), which can play a synergistic role of the double matrix, significantly improve the detection sensitivity of oligosaccharide. On the other hand, the combination of CHCA and 2-AIA with different pH values can significantly improve the uniformity of the co-crystallization, and improve the accuracy and reproducibility of quantitative detection.

The invention discloses cysteine mediated Hf / Cu bimetal synergistic self-assembled nano-particles as well as a preparation method and application of the cysteine mediated Hf / Cu bimetal synergistic self-assembled nano-particles. According to the method, cysteine is used as a multifunctional ligand, carboxyl and sulfydryl of cysteine are in bridge connection with metal through coordination, ligand chelation and assembly guiding effects are synchronously exerted, bimetallic ions are induced to be cooperatively self-assembled in an alkaline system (pH is 9-10), and metal cysteine self-assembled nanoparticles with uniform structures are formed through in-situ nucleation and multistage aggregation. According to the method, the ligand function and the bimetallic synergistic effect are accurately matched, the synthesis process is mild (room temperature), the operation is simple and convenient, and the product is excellent in dispersity and stability. Meanwhile, a close coordination structure constructed by cysteine provides a key channel for energy / electron transfer from sensitizing metal to Cu under X-ray irradiation, and lays a structural foundation for subsequent catalytic effect enhancement.

The application discloses an aggregation-induced emission metal organic framework, a preparation method thereof and fluorescent / colorimetric dual-mode intelligent detection for trace HCl. 2+ The aggregation-induced emission metal organic framework is prepared by providing Zn(NO3)3.6H2O as Zn 2+ , imidazole-2-formaldehyde and an AIE molecule HDBB as organic ligands, and through a solvothermal method to obtain ZIF-90-HDBB, which can change the aggregation state fluorescence from yellow green to orange red after being contacted with HCl gas; the ZIF-90-HDBB is uniformly loaded on cellulose filter paper to obtain a paper-based sensor for portable detection of HCl, and through combination with a color recognition APP of a smart phone, the HCl can be rapidly and sensitively detected on site in a fluorescent / colorimetric dual mode. Since the HDBB molecule is prone to protonation under acidic conditions, the fluorescence color changes, and therefore the material can be accurately and efficiently used for detection of acidic gas, and the material can be recycled.

The invention discloses a method for catalyzing hydrolysis of hexafluorophosphate radicals by using a bifunctional solid acid material, the main active sites of the bifunctional solid acid material in the method are a Brnsted acid site formed by combining protonated sulfate radicals (HSO4 <->) with hydroxyl groups on the surface of TiO2 and a Ti < 4 + > (Lewis acid) site enhanced by induction of the Brnsted acid site, and in the catalytic hydrolysis process, the Brnsted acid site and the Ti4 < + > (Lewis acid) site can be used for catalyzing hydrolysis of the hexafluorophosphate radicals by using the bifunctional solid acid material. Ti4 < + > (Lewis acid site) generates strong adsorption and activation effects on PF6 <->, adjacent HSO4 <-> (Brnsted acid site) and PF6 <-> generate H.. F-P interaction, and the two sites apply a synergistic stretching effect on a P-F bond from different directions, so that a stable regular octahedron structure of PF6 <-> is greatly damaged, a reaction energy barrier of P-F bond breakage is remarkably reduced, efficient hydrolysis of PF6 <-> is realized, and the reaction time is shortened. The method has the advantages that the hydrolysis efficiency is high, the hydrothermal stability is good, extreme acid and alkali environments are not needed, the bifunctional catalyst is easy to regenerate and the like, and a brand new technical path and a solution are provided for harmless treatment of the hexafluorophosphoric acid-containing wastewater.

The application discloses a preparation method of a copper-based metal complex and application of the copper-based metal complex in antioxidation activity, relates to the technical field of functional materials, and has the chemical formula [Cu(H3dhbdc)2(H2O)2], wherein H3dhbdc is deprotonated 2,3-dihydroxyterephthalic acid. The copper-based metal complex has specific crystal structure and spatial structure, high synthesis purity, and good stability, and can be used in antioxidation activity. Under the same condition, the scavenging ability of H4dhbdc and the copper-based metal complex on •OH and O2 •‑ is explored, the copper-based metal complex is equivalent to H4dhbdc in terms of the scavenging effect on •OH free radicals, and is better than H4dhbdc in terms of the scavenging effect on O2 •‑ free radicals, and it is shown that the complex Cu 2+ after complexation not only retains the antioxidation activity of H4dhbdc, but also enhances the enzyme activity of H4dhbdc.

The application discloses a dual-response double-network fracturing fluid thickening agent and a preparation method thereof, relates to the technical field of oil field chemistry and fine chemistry, and comprises the following steps: cross-linking and polymerizing non-ionic monomers and a cross-linking agent under the action of an initiator to form a first network structure, and utilizing a carboxyl-containing polymer filled in the first network structure to form a second network structure. The non-ionic monomers are at least one of acrylamide and modified acrylamide. The double-network fracturing fluid thickening agent is ionically cross-linked with high-valence cations under high salinity, forms an "egg box" structure, causes molecular chain aggregation and gelation. Under acidic conditions, the carboxyl groups are protonated, the charge density of the molecular chains is reduced, the electrostatic repulsion is weakened, inter-chain aggregation and precipitation are caused. In addition, the protonated carboxyl groups form intramolecular and intermolecular hydrogen bonds with hydroxyl groups, further promote inter-chain aggregation. Therefore, the prepared double-network thickening agent has the characteristics of high density, salt resistance and acid resistance, and remarkably improves the stimulation effect of unconventional oil and gas reservoirs.

This application discloses a crystal, a rare-earth-doped crystal, its preparation method, and its applications, belonging to the field of crystal materials. The chemical formula of the crystal is [Gd(L)]. 1.5 (DMA)] n Formula I; in Formula I, L is a ligand formed by deprotonated benzene polycarboxylic acid; benzene polycarboxylic acid is selected from any one of terephthalic acid, phthalic acid, and isophthalic acid; DMA is N , N -Dimethylacetamide; n ∞ represents continuous repetition and infinite extension. The crystal is rare-earth doped, and the chemical formula of the rare-earth doped crystal is [Gd]. 1‑x% (L) 1.5 (DMA)] n :x% Ln 3+ Equation II; in Equation II, x = 0.1~10; Ln 3+ Selected from Tb 3+ Or Eu 3+ Any one of the following. It has potential application value in fields such as fluorescent materials, multicolor display materials, long afterglow materials, X-ray detection and imaging materials, radiation detection dosimeters, and optical information encryption. The preparation method used in this application can be easily achieved through solution reaction under relatively mild conditions, with low cost and strong industrial feasibility.

The application belongs to the technical field of asymmetric catalytic synthesis, and particularly relates to an alpha-carbon chiral phosphine compound and a preparation method thereof. In a protective gas atmosphere, an asymmetric boron protonation reaction is carried out on a dienyl phosphine oxide compound shown in a structure of formula II, pinacol borate, a copper (I) catalyst, a chiral ligand, an organic alkaline compound and a proton additive in a polar organic solvent to obtain an alpha-carbon chiral phosphine compound shown in a structure of formula I; the chiral ligand is a cyclic phosphine ligand (S, S)-Ph-BPE or a cyclic phosphine ligand (R, R)-Ph-BPE. The preparation method provided by the application can synthesize the alpha-carbon chiral phosphine compound shown in the structure of formula I with high yield and excellent enantioselectivity, the synthesis method is simple and low in cost, and the alpha-carbon chiral phosphine compound can be further converted into a new optically active product.

The application discloses a method for synthesizing an alpha-position chiral nitrogen heteroaromatic ring under the synergistic catalysis of a chiral phosphoric acid and a Lewis acid, and the method comprises the following steps: taking a nitrogen heteroaromatic ring olefin I as an electrophilic reagent, taking an aryl alkyl boronic acid II as a carbon nucleophile, and under the synergistic catalysis of a Lewis acid catalyst and a chiral phosphoric acid catalyst, in the presence of an organic solvent, an additive and a proton source, performing a conjugate addition-asymmetric protonation reaction to generate an alpha-position chiral nitrogen heteroaromatic compound shown in formula V, and the reaction is shown as follows: The application provides a conjugate addition-asymmetric protonation strategy for a nitrogen heteroaromatic ring olefin, which is synergistically catalyzed by a chiral phosphoric acid and a Lewis acid (Fe(OTs)3) and involves an organic boron reagent, a series of alpha-position chiral nitrogen heteroaromatic compounds are successfully synthesized by using the catalytic system, the highest enantioselectivity reaches 98% ee, and good universality is shown for aryl, heterocyclic and polysubstituted substrates, and the bottleneck problem of low reactivity of 1,1-disubstituted substrates in a traditional method is effectively overcome.

The invention discloses a protonated Cu-HHTP hydrogen sulfide gas-sensitive material as well as a preparation method and application thereof, and belongs to the technical field of gas sensors and metal organic framework materials, the gas-sensitive material is based on Cu3 (HHTP) 2 (Cu-HHTP), and an exposed copper metal cluster can be used as an adsorption / desorption site of H2S gas molecules, so that the gas-sensitive material can be applied to the field of gas sensors and metal organic framework materials. Therefore, the material has response capability to H2S in an intrinsic state. By carrying out protonation treatment on the material, introduced H < + > provides a richer electron transmission channel while effectively reducing the intrinsic resistance of the material, so that the conduction efficiency of H2S in a material system is remarkably enhanced. In addition, due to the inherent lamellar morphology and porous rod-like structure of Cu3 (HHTP) 2, the material is endowed with the characteristic of high specific surface area. The structural advantage is combined with the protonation design to jointly improve the gas-sensitive property of the material.

The application discloses a method for determining the content of NBPT in urea, comprising the following steps: S1, preparation of a detection reagent; S2, sample pretreatment; S3, chromatography-mass spectrometry combined detection; and S4, quantitative analysis. The method directly injects a 0.1% formic acid aqueous solution-acetonitrile mobile phase system into an LC-MS / MS system, wherein the formic acid serves as an ionization promoter to significantly improve the protonation efficiency of NBPT under ESI + source, the response intensity of [M+H] + is greater than 10 5 cps, and the derivatization step necessary for a traditional HPLC-UV method is completely eliminated; secondly, a blank matrix extraction liquid is introduced to match a standard curve, and a standard sample is diluted by a urea / fertilizer matrix extraction liquid homologous to the sample to be measured, so that the ion suppression effect of humic acid on the target object is accurately offset, the standard addition recovery rate of a complex matrix sample is stably kept at 85%-99.5%, and the quantitative deviation is less than 5%.

This invention discloses a method for preparing a protonated Hβ molecular sieve catalyst using acid treatment modification, the obtained catalyst, and its application. A β molecular sieve is mixed with an ammonium chloride solution, and after sufficient ion exchange, the resulting mixture is transferred to a centrifuge tube, centrifuged, and washed several times with water. The lower solid layer is dried and ground. After grinding, the solid is placed in a crucible, which is then placed in a muffle furnace for a first calcination at high temperature, yielding an H-type β molecular sieve. The obtained H-type β molecular sieve is mixed with an inorganic acid solution, and after sufficient acid leaching, the resulting mixture is allowed to cool to room temperature, filtered, and washed several times with water. The upper solid layer is dried and ground. After grinding, the solid is placed in a crucible, which is then placed in a muffle furnace for a second calcination at high temperature, yielding a protonated Hβ molecular sieve catalyst. This invention first hydrogenates the molecular sieve and then modifies it with an acid solution to construct highly efficient and stable active sites, thereby achieving efficient NO removal.

The application discloses a preparation method of a copper-based metal-organic framework material and application of the copper-based metal-organic framework material in antioxidant activity, relates to the field of metal-organic framework material synthesis, and the chemical formula of the copper-based metal-organic framework material is [Cu II 6(o-dhbdc)2(o-H2dhbdc) 0.5 (o-H2dhbdc) 0.5 (o-H3dhbdc)2.(H2O)3], which is abbreviated as Cu-PCP, wherein dhbdc, H2dhbdc and H3dhbdc are deprotonated 2,3-dihydroxyterephthalic acid. The Cu-PCP has a clear crystal structure and spatial configuration, high synthesis purity, excellent stability, and exhibits significant antioxidant activity; the material has significantly enhanced O₂ •⁻ elimination capacity; in addition, Cu²⁺ not only retains the original antioxidant performance of the ligand, but also further improves the overall free radical elimination capacity of the material.

The invention discloses an interpenetrating type iron-based metal organic framework material and a preparation method and application thereof, the molecular formula of the material is [Fe3O4 (H2O) 3 (L1) (L2) 4 / 3], in the formula, L1 represents deprotonated 4-(4-carboxybenzamido) benzoic acid, L2 represents deprotonated 1, 3, 5-tri (4-carboxyphenyl) benzene, and n represents 1, 3, 5-tri (4-carboxyphenyl) benzene; the material belongs to a hexagonal crystal system and an R-3c space group, and is prepared by taking a trinuclear iron cluster, 4-(4-carboxybenzamido) benzoic acid and 1, 3, 5-tri (4-carboxyphenyl) benzene as raw materials, acetic acid as a template agent and N, N-dimethylformamide and n-amyl alcohol as solvents through solvothermal reaction. The interpenetrating type iron-based metal organic framework material disclosed by the invention has a relatively large specific surface area and a relatively large pore structure, has good adsorption performance on methane and carbon dioxide, and has a wide application prospect in the fields of methane storage and flue gas carbon dioxide capture.

This invention discloses a method for preparing nano-high-entropy metal-organic frameworks (MOFs) and their applications. The preparation method includes the following steps: 1) dissolving five or more metal salt precursors in water to obtain solution A; 2) mixing and dissolving an organic ligand with a deprotonated basic additive in water to form solution B; 3) starting a high-gravity reactor; 4) introducing solutions A and B into the high-gravity reactor at room temperature and atmospheric pressure using a peristaltic pump, collecting the resulting suspension, and allowing the suspension to stand for aging to obtain the corresponding high-entropy MOF suspension; 5) centrifuging, washing, and drying the above suspension to obtain the high-entropy MOF material. This preparation method is carried out at room temperature and atmospheric pressure, using only water as the reaction solvent; the method is simple, the reaction is rapid, improving production efficiency, and it does not use organic solvents, making it environmentally friendly; the obtained nano-high-entropy MOFs product has a controllable particle size, with an average particle width ≤250 nm and a specific surface area of ​​up to 860 m². 2 / g.

This invention discloses an N-substituted pyridine fluoroborate inner salt reagent, its preparation method, and its application in the preparation of F-18 radiopharmaceuticals. The N-substituted pyridine fluoroborate inner salt reagent is obtained by reacting protonated pyridine fluoroborate of Formula I with a compound of Formula II in the presence of a solvent. This inner salt reagent, through a substituted alkyl group linked to the pyridine N-phase, can undergo a coupling reaction with molecules containing specific groups (including drug molecules or their derivatives) to generate F-18 radiopharmaceutical precursors. Further isotope exchange reactions yield the F-18 radiopharmaceutical. By adjusting the types of substituents in the substituted alkyl group, this invention can achieve the construction of structurally diverse F-18 radiopharmaceutical precursors with different drug molecules or their derivatives. Furthermore, the prepared F-18 radiopharmaceutical precursors exhibit good stability in aqueous phase and can undergo efficient reactions in aqueous buffer solutions. 18 F- 19 The F isotope exchange reaction avoids the time-consuming dehydration process in the traditional F-18 radiopharmaceutical synthesis, greatly shortening the synthesis time and thus effectively improving the efficiency of F-18 radiopharmaceutical synthesis. 18 F-labeling rate.

This paper describes a class of dyes containing 1,4-diazabicyclo[2.2.2]octane, their preparation methods, and applications, belonging to the fields of optical diagnostics and biomedicine. The dye comprises the dye molecule and 1,4-diazabicyclo[2.2.2]octane covalently coupled to the dye. 1,4-diazabicyclo[2.2.2]octane directly quenches singlet oxygen generated by the dye, affecting the triplet state of the dye, thereby improving its anti-bleaching ability and photostability, and reducing phototoxicity during fluorescence imaging. Furthermore, the introduction of 1,4-diazabicyclo[2.2.2]octane significantly improves the brightness of the dye, inhibits photoscintillation, and enhances its water solubility. Its protonation characteristic enhances the dye's mitochondrial targeting ability. These compounds, by reducing singlet oxygen and enhancing the local photothermal and reactive oxygen species production in mitochondria, induce potent cell necrosis, apoptosis, and immunogenic cell death, comprehensively improving anticancer efficacy. These compounds exhibit excellent photostability and low skin toxicity, showing broad application prospects.

The invention relates to a method for detecting tertiary amine type niash substances. The method aims at solving the problems that in electrospray ionization source mass spectrometry analysis of tertiary amine type niash substances, parts with structural differences are lost in the form of neutral fragments, mass spectrometry data of the tertiary amine type niash substances are basically the same, and qualitative analysis of structural identification cannot be carried out through the mass spectrometry data. According to the invention, a tertiary amine type niash substance is converted into a corresponding N-oxide through an oxidation pretreatment method, and the protonation position of the tertiary amine type niash substance in an electrospray ion source is changed, so that a part with functional group difference in the structure can generate fragments with positive electrons, and the characteristics of functional groups in the structure are reflected; the purpose of structural identification qualitative analysis through mass spectrum characteristic fragment data is achieved. The method is simple and convenient to operate, is suitable for mass spectrometry of a conventional electrospray ionization source and a neutral gas collision cell, and can provide an effective technical means for reliable identification and judicial expertise of the substance.

A method for forming a film, comprising the steps of: providing a solution comprising a polyalkylenimine, chloride counterions to protonated sites on the polyalkylenimine, and chloride ions; exchanging bound hydroxide anions from an anion exchange material for the chloride ions yielding released hydroxide anions; increasing pH of the solution, without a correlated sodium ion increase, through reaction of protons in the solution with the released hydroxide anions from the anion exchange material, which partially deprotonates the polyalkylenimine; repeating the steps of exchanging, increasing, and deprotonating until the pH of the solution increases to greater than three; and forming the film from the solution, the film comprising a thickness in a range of 0.1 to 10 μm with a charge density, of protonated sites of the film, of greater than 300 C / in3, the protonated sites associated with counteranions.

The application belongs to the technical field of stimuli-responsive fluorescent materials, and discloses a 1,3,4-oxadiazole derivative with strong solvatochromic and acid-induced fluorescence enhancement, and a preparation method and application thereof. The intermediate product is obtained by mixing 3-dimethylaminobenzhydrazide, acyl chloride and a solvent for reaction; and the 1,3,4-oxadiazole derivative is obtained by mixing the intermediate product and phosphorus oxychloride for reaction. The molecule prepared by the application can distinguish different polar solvents and is also sensitive to protons. With the addition of TFA, the fluorescence emission peak is blue-shifted and enhanced, and the fluorescence quantum efficiency reaches 69.8% after acidification. The solid thin film can also exhibit good pH response, and the thin film is blue-shifted from yellow-green light emission to blue light emission and the fluorescence is enhanced after acid fumigation. The molecule of the application is stable after protonation, exhibits acid-induced fluorescence enhancement property, is beneficial to improve the sensitivity of pH detection, and has important roles in the fields of medical care, environmental monitoring and industrial processes.

This invention discloses an ultrastable hydrogen-bonded organic framework material, its preparation method, and its applications. The preparation method involves mixing a deprotonated solution of 6,6',6'',6'''-(pyrene-1,3,6,8-tetramethyl)tetra(2-naphthoic acid) with a solution of 4,4',4'',4'''-methanetetraphenylamidine tetrahydrochloride. After standing in the dark, the mixture is centrifuged, washed, and lyophilized. The resulting hydrogen-bonded organic framework material exhibits excellent stability and high photocatalytic efficiency, making it effective for the photocatalytic preparation of BHMF from HMF. Adding MsAcT enzyme powder to the 4,4',4'',4'''-methanetetraphenylamidine tetrahydrochloride solution yields a hydrogen-bonded organic framework material encapsulating MsAcT enzyme. This material can be effectively used for the one-pot photocatalytic preparation of BHMF diacetate from HMF.

The invention belongs to the field of organic-inorganic hybrid functional crystal materials, and relates to an inorganic-organic hybrid three-dimensional crystal as well as a preparation method and application thereof, raw materials containing hydroiodic acid, a protonated organic molecular cage C-D3T2 and a lead source are mixed with a solvent, and the inorganic-organic hybrid crystal is obtained through solvothermal reaction. The chemical formula of the prepared crystal is {[C-D3T2] [Pb5I14 (I3)]}. I. 6H2O; wherein the molecular formula of the C-D3T2 organic cage is H6 [C36H54N8]. The crystal is of a host-guest body structure assembled by a three-dimensional inorganic framework [(Pb5I14) I3] n5n-and a C-D3T2 molecular cage through electrostatic interaction and belongs to a monoclinic system, and the space group is C2 / c. The crystal is of a three-dimensional nested structure constructed by an organic molecular cage and inorganic lead iodide for the first time, and has certain application potential in the field of photothermal conversion.

The application provides application of anthracene fluorescent material in detection of pH value, preparation of lysosome and / or mitochondrion targeted reagent and diagnosis and treatment of tumor cells, and belongs to the technical field of fluorescent sensing. The anthracene fluorescent material has high fluorescence quantum yield and good light stability; the anthracene fluorescent material has protonation effect between amino groups and hydrogen ions, can be used as a combination site of protons, can realize quantitative detection of pH value, and can be used as a targeting group of lysosomes in cells; the amino groups combine with hydrogen ions to generate quaternary ammonium salt, which can increase hydrophilicity, and the generated positive charge can be used as a mitochondrion targeting group, so that the anthracene fluorescent material realizes dual-color visualization targeting lysosomes and mitochondria in cells; and based on the transformation between amino group protonation and non-protonation, the anthracene fluorescent material can be used as an acid triggered probe for tumor diagnosis, realizes high selectivity visualization tumor detection and tumor treatment in a living body.

The present application relates to the field of fluorescent sensing technology, and particularly relates to a Eu(III) metal organic framework crystalline material, a preparation method and application thereof. The Eu(III) metal organic framework crystalline material is formed by assembling a multi-nuclear Eu ion cluster and a polycarboxyl organic ligand, and an asymmetric structural unit thereof comprises a plurality of valence states of Eu ions, monodentate coordination water molecules and partially deprotonated H(DDODA) 3‑ ligands. The Eu(III) is in an octahedral coordination configuration, and the Eu(II) is in a nonahedral coordination configuration, and a trinuclear {Eu3(H2O)5(COO) 18} secondary structural unit is formed by chelation and bridging action of carboxyl oxygen atoms. The secondary structural unit is further connected to form a one-dimensional chain structure through bridging carboxyl of the ligand, and the one-dimensional chains are further connected through carboxyl not participating in bridging and pyridine / pyridine groups, and finally a stable three-dimensional metal organic framework structure is constructed. The Eu(III) metal organic framework crystalline material has good fluorescence properties and stability, and can be applied to the field of fluorescent sensing.

The invention relates to the technical field of fluorescence sensing, in particular to a zinc (II) metal organic framework material for Cu < 2 + > and NB detection and organic dye photocatalytic degradation and a preparation method. The metal organic framework material [Zn (cpt) 2] n based on metal zinc (II) is prepared through a one-pot hydrothermal reaction, the single crystal molecular formula of the metal organic framework material [Zn (cpt) 2] n is C56H36ZnN6O6, a ligand is deprotonated Hcpt, and Hcpt is 4 '-(4-(4-carboxyl phenoxy) phenyl)-4, 2': 6 ', 4' '-terpyridyl. The preparation method has the advantages of mild conditions, simplicity and convenience in operation, high yield, good repeatability and the like. The prepared zinc (II) metal organic framework material has good structural stability and fluorescence characteristics, has high selectivity and sensitivity to Cu < 2 + > and nitrobenzene (NB), and is a good fluorescence sensor for detecting Cu < 2 + > and nitrobenzene; meanwhile, the zinc (II) metal organic framework material has good performance of photocatalytic degradation of organic dye and has a good photocatalytic degradation effect on the organic dye rhodamine B.

This invention discloses a method for preparing and applying a two-dimensional lead bromide perovskite single crystal based on 1-amino-4-methylpiperazine in the Dion-Jacobson phase, wherein the chemical formula of the single crystal is (C5H). 14 N3)PbBr4, where C5H 14 N3 2+ It is a diprotonated 1-amino-4-methylpiperazine cation; single-crystal X-ray diffraction analysis shows that it has a typical two-dimensional Dion-Jacobson phase layered structure, belongs to the monoclinic crystal system, space group P21 / n, and its structure is dominated by [PbBr4]. 2‑ The single crystal is constructed by alternating stacks of octahedral inorganic layers and diammonium cation organic layers. The preparation method involves: first, dissolving 1-amino-4-methylpiperazine in hypophosphite and lead oxide in hydrobromic acid; then mixing the two solutions and heating them at 100-130°C to form a homogeneous precursor solution; finally, obtaining the single crystal through a programmed slow cooling method. This invention utilizes hydrobromic acid as a medium to achieve precise protonation of organic amines and a high-concentration bromine environment. The resulting single crystal exhibits high crystal quality and good stability, demonstrating significant application potential in optoelectronic fields such as polarization detection, nonlinear optics, and light-emitting devices.

The invention provides a mass-to-charge ratio-based proton transfer reaction time-of-flight mass spectrometer calibration method, and the method comprises the steps: S1, obtaining a function relation between the sensitivity of each standard gas group and the charge ratio of a corresponding protonation product, each standard gas group independently comprises organic matter gases belonging to the same category but different specific categories; s2, respectively substituting the mass-to-charge ratios of the protonated products of different gas components in the gas to be detected into the function relationship of the respective corresponding standard gas group, and calculating to obtain the respective sensitivity of the different gas components in the gas to be detected; and S3, calculating the concentration of the gas component in the gas to be detected according to the respective peak response intensity and sensitivity of different gas components in the gas to be detected. According to the method, the reaction rate constant between the volatile organic compound and the hydrated hydrogen ions does not need to be obtained in advance, and the quantitative analysis efficiency of the proton transfer reaction time-of-flight mass spectrometer in a complex environmental sample is remarkably improved.

The invention relates to a neodymium complex [NdL (H2O) 2]. 3H2O, HL = 1, 3, 5-tri (carboxyl methoxy) benzene. An asymmetric structural unit of the neodymium complex is composed of an Nd < 3 + >, a completely protonated carboxylic acid ligand, water molecules with two structures and three free water molecules. A central metal ion Nd < 3 + > in the molecule, eight carboxylic acid oxygen atoms on five ligands and oxygen atoms on two water molecules are subjected to ten-coordination to form a double-cap tetragonal reverse prism structure, and chains are orderly stacked into a three-dimensional structure through ligand oxygen bridging, pi-pi interaction of ligand benzene rings and hydrogen-bond interaction. The conductive potential (-0.52 eV) of the neodymium complex is more negative than that of E (H < + > / H2), the hydrogen production rate of the neodymium complex used for photocatalytic water decomposition is 18.58 [mu] mol.g <-1 >. H <-1 >, the selectivity of catalyzing benzylamine oxidation to generate N-benzyl-1-phenylmethyleneimine under the air condition is 100%, and the yield is 26.9%.

This invention discloses a polyacid-organic supramolecular framework material, its preparation method, and its applications. The molecular formula of the polyacid-organic supramolecular framework material is H3(HIm). 11 [Sb2W 19 O 67 (H₂O)]·solvent, where Im=imidazole; the polyacid-organic supramolecular framework material has hexagonal channels, and the structural characteristics of the polyacid-organic supramolecular framework are: six [Sb₂W] 19 O 67 [H2O] The polyanionic building block is located at the six corners of a hexagon, and is formed by 30 protonated imidazole countercations linked by multiple hydrogen bonds to form a hexagonal supramolecular cluster. The molecular formula of the cluster is {[Sb2W] 19 O 67 (H2O)]6(Him) 30 Adjacent clusters form a one-dimensional nanotube structure through supramolecular interactions of imidazole counter cations, and the nanotubes are then connected by imidazole counter cations to form a three-dimensional supramolecular framework; the polyacid-organic supramolecular framework material is used as a proton conduction material in the field of fuel cells.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a modified chitosan-based material as well as a preparation method and application thereof. The preparation method of the modified chitosan-based material comprises the following steps: dropwise adding acid into a precursor aqueous solution, and carrying out protonation reaction to prepare a protonated chitosan solution; adding tripolyphosphate into the protonated chitosan solution, and carrying out a cross-linking reaction to prepare modified chitosan powder; the precursor aqueous solution is a chitosan aqueous suspension or a Schiff base chitosan solution; the acid is hydrochloric acid or monochloroacetic acid. And subsequently, adding water, sodium alginate and a cross-linking agent into the modified chitosan powder to prepare the modified chitosan hydrogel. The defects that an existing chitosan derivative is not developed in pore structure, not obvious in specific surface area and not rich in active sites are overcome, and the problems that when an existing chitosan-based uranium removal material is used for treating weak-acid uranium-containing wastewater, complexing strength is low, adsorption capacity is small, separation and recovery are difficult, and potential secondary pollution is caused are solved.