14 results about "Achirality" patented technology

The invention provides a fullerene pyrrolidine enantiomer mediated cholesteric liquid crystal with circular polarization luminescence property and nonlinear anti-saturated absorption property, and a preparation method and application thereof. The method comprises the following steps: dissolving C60, paraformaldehyde and (R / S)-(+ / -)-alpha-methylbenzylamine in an organic solvent, and carrying out heating reflux reaction to obtain fullerene pyrrolidine enantiomer molecules; dissolving in carbon disulfide to obtain an enantiomer solution; dissolving achiral dye molecules in a solvent to obtain a dye solution; and dropwise adding the enantiomer solution and the dye solution into thermotropic liquid crystal molecules, and drying to obtain the thermotropic liquid crystal. The method is simple, the obtained cholesteric liquid crystal system shows a characteristic fingerprint texture and has a periodic spiral structure, and the doping proportion of chiral molecules is easy to adjust; the composite system has good time stability and is not prone to phase separation; the liquid crystal platform shows good circular polarization luminescence performance and third-order nonlinear optical property, and is a cholesteric liquid crystal platform with an integrated function.

The invention relates to an artificial synaptic device based on chiral perovskite and a preparation method thereof. The device sequentially comprises a substrate, a comb-shaped bottom electrode, a chiral perovskite functional layer and a comb-shaped top electrode from bottom to top, wherein the projection direction of the bottom electrode comb teeth and the projection direction of the top electrode comb teeth are crossed at an angle of 90 degrees; the chemical general formula of the chiral perovskite functional layer is A < 1-x > A'x PbX3, A is a chiral organic cation, A 'is an achiral organic cation, and X is one or more of Cl <->, Br <-> and I. The device obtained by the invention can respond to a chiral optical signal and complete processing and storage of chiral information, and has an excellent brain synaptic-like function at the same time.

This invention relates to the field of electrocatalyst technology, and in particular to a chiral CoFe-based oxygen evolution electrocatalyst, its preparation method, and its application. Iron salts, cobalt salts, and chiral tartaric acid are dissolved together in N,N-dimethylformamide solvent to form a homogeneous mixed solution. Hydrazine hydrate is added to the mixed solution and thoroughly mixed. The solution is then transferred to a high-pressure reactor and subjected to a solvothermal reaction at a set temperature to obtain a nanocatalyst precursor. The nanocatalyst precursor is then subjected to centrifugation, washing, drying, and vacuum calcination to obtain the product. This method successfully prepares a chiral CoFe-based nanocatalyst through the inductive effect of chiral tartaric acid, combined with a specific solvothermal reaction and subsequent heat treatment process. This chiral CoFe-based electrocatalyst exhibits significantly enhanced catalytic activity and stability in the oxygen evolution electrocatalytic reaction, demonstrating superior electrochemical performance compared to achiral catalysts.

The invention relates to the technical field of chiral self-assembly materials, and discloses a novel achiral fluorescent material which is characterized in that a D-A type conjugated skeleton is constructed by taking a spirofluorene unit as an electron donor (D) and carborane and triazine as electron acceptors (A); carborane has an AIE effect, triazine is an important six-membered heteroaromatic ring, has three nitrogen atoms, generates three regioisomers, and is widely used for preparing thermal delay fluorescent materials due to good thermal stability, light stability and thermal delay performance; a triazine derivative is used as a hub to be respectively connected with spirofluorene-o-carborane; a three-dimensional space structure of an o-carborane molecule and a rigid structure of a triazine molecule are combined, so that unique photoelectric properties are achieved; the invention provides a basis for the design of the boron cluster material in the aspects of photoelectric application and the like; and a new thought is provided for the research of the light-emitting boron cluster in circularly polarized light emission.

The invention provides a novel chiral phosphine-phosphoramidite ester ligand which is based on an achiral open-chain phenol non-cyclic phosphoramidite ester structural unit and only has skeleton single-center chirality, and a preparation method and application thereof. Different from a traditional chiral phosphine-phosphoramidite ligand, a phosphoramidite structural unit in the novel chiral phosphine-phosphoramidite ligand does not contain a chiral element and is of a non-cyclic open-chain structure. The novel ligand is prepared by taking a chiral phosphine / amine intermediate (R)-or (S)-DPPNHMe, a phenol compound and PC13 as raw materials under a mild condition. The novel chiral phosphine-phosphoramidite ligand provided by the invention has the characteristics of cheap and easily available raw materials, simple synthesis, stable properties, adjustable space structure and electronic properties, excellent activity and enantioselectivity in catalysis of asymmetric hydrogenation reaction, and the like.

The invention relates to a method for synthesizing cyclopentenyl ketone under the catalysis of nickel and aluminum, which comprises the following steps: adding a secondary phosphine oxide ligand PO, a metal catalyst Ni (cod) 2, a solvent, cyclopropyl ketone and alkyne into a reaction container in a nitrogen atmosphere, then adding lewis acid, stirring at a specified reaction temperature, adding an ethylene diamine tetraacetic acid aqueous solution after the reaction is completed, washing, separating liquid, and drying to obtain the cyclopentenyl ketone. And carrying out drying and column chromatography separation on the organic phase to obtain chiral or achiral cyclopentenyl ketone. The method has the advantages of wide substrates, strong tolerance of reaction to functional groups of the substrates, no atom loss, high atom economy and step economy, capability of effectively inhibiting side reactions caused by enolation racemization of ketone and Lewis acid through coordinated regulation and control of the ligand and the solvent, and extremely high reaction efficiency and stereo control capability.

The invention belongs to the technical field of high polymer materials, and discloses a method for regulating and controlling a chiral structure and chiral transfer of a triblock copolymer by a middle block, the chiral triblock copolymer and application. The method comprises the steps that firstly, a chiral triblock copolymer is selected, the structural general formula of the triblock copolymer is PS-b-B-b-PLLA, B is a middle block, and B is selected from one of the following polymer chain segments: PLA, PEO, PCL, P4VP, P4CS and PMMA; then regulating and controlling the self-assembly behavior of the triblock copolymer through B, so that the copolymer is self-assembled to form a chiral structure or an achiral structure; the regulation comprises the steps of 1) determining chi between the middle block B and the PLLA, and 2) determining the chain length of the middle block B. According to the chiral triblock copolymer, chiral transmission of the triblock copolymer is realized, and a chiral spiral phase structure is formed through self-assembly, and the chiral triblock copolymer is used for preparing advanced functional materials such as chiral photonic crystals, circular polarization luminescent materials and chiral separation membranes.

This invention discloses a method for producing high-purity (1R,2S,5R)-WS-3, comprising the following steps: using a mixture of menthol containing eight stereoisomers or naturally extracted menthol as raw material, and reacting it with diethylamine and phosgene under solvent-free conditions at 55-65°C; using a non-chiral adsorbent to separate six diastereomers of (1R,2S,5R)-WS-3 from the obtained WS-3 mixture, and then using a chiral adsorbent to separate the remaining two enantiomers, thus obtaining high-purity (1R,2S,5R)-WS-3. This invention achieves the production of high optical purity (1R,2S,5R)-WS-3 menthol amide cooling agent under mild operating conditions, and has significant industrial application value for the efficient production and quality upgrading of cooling agents.

This invention belongs to the field of chemical energy storage battery technology, specifically providing a chiral hydrogel electrolyte based on supramolecular assembly and its preparation method, to solve the problems of disordered ion channels and insufficient free water binding in traditional achiral gel electrolytes. This invention introduces a single, pure-configuration chiral guest molecule into an achiral polymer substrate, forming a supramolecular chiral membrane based on stereo-oriented supramolecular assembly. After swelling and saturation in an aqueous electrolyte, a chiral hydrogel electrolyte is obtained. The chiral guest molecule, acting as a topological guest, reshapes the polymer topology network, forming a stereo-oriented network, causing a sudden leap in the gel's energy storage modulus, thus providing resistance to dendrite penetration. Simultaneously, the chiral guest molecule can achieve interfacial stability at the negative electrode, further suppressing dendrite formation at the negative electrode. Furthermore, the stereo-oriented network can significantly limit the activity of free water molecules, eliminating the erosion of the vanadium cathode by free water molecules and vanadium dissolution.

This invention discloses a method for detecting 99 achiral / chiral endocrine disruptors in urine based on a dual-column coupled analysis system, belonging to the field of pollutant monitoring and analysis technology. The method involves a single pretreatment of the urine sample, including formic acid-acetonitrile extraction and ethylenediamine-N-propyl silica gel purification. A dual-column coupled analysis mode is then used, with a C18 column simultaneously quantifying the total concentration of 93 achiral endocrine disruptors (EDCs) and 6 chiral pesticides. The chiral column yields the R / S enantiomer signal intensity ratio, and the content of each enantiomer is calculated using a "total-proportional conversion" model. This invention achieves, for the first time, a unified detection system for achiral and chiral substances, eliminating the need for a single enantiomer standard; accurate quantification can be achieved using only racemic mixtures, effectively avoiding the direct quantitative bias of chiral columns. The method has a limit of quantification as low as 0.25 μg / L, is simple to operate, low in cost, and has good reproducibility, providing an efficient and reliable analytical tool for population exposure monitoring and chiral selective metabolism research.

The application discloses a water-soluble achiral rare earth tetrahedral cage CPL probe for recognition of mercapto amino acids and a preparation method thereof, and relates to a CPL probe for recognition of mercapto amino acids and a preparation method thereof. The application is aimed at solving the problems that water solubility and functional cavities are difficult to balance, and specific recognition ability is limited in the detection of mercapto amino acids by using existing supramolecular cage optical probes. The water-soluble achiral rare earth tetrahedral cage CPL probe for recognition of mercapto amino acids has high water solubility, strong CPL signal and high selective rare earth tetrahedral cage probe, realizes efficient recognition and quantitative detection of mercapto amino acids such as D-penicillamine, and has the advantages that Eu4L4 is an achiral rare earth tetrahedral cage, the number of aldehyde groups is multiplied due to the tetrahedral structure, excellent circularly polarized luminescence performance is exhibited, high-precision distinction between mercapto amino acids and non-mercapto amino acids is successfully realized, and the selectivity of detection is remarkably improved.

The application aims to provide an organic-inorganic hybrid chiral film and a preparation method thereof. The organic-inorganic hybrid chiral film comprises at least two hybrid orientation films, the hybrid orientation film comprises a flexible polymer film and one-dimensional metal nanomaterials distributed on the surface of the flexible polymer film and arranged in an orientation manner, and the flexible polymer film is an achiral polymer film; and each layer of the hybrid orientation film is arranged in a preset deflection angle along the orientation axis direction of the one-dimensional metal nanomaterials. The obtained chiral film is not dependent on a chiral template, has high CD intensity, high g-factor and covers ultraviolet-visible-near infrared super wide wave bands, and the preparation method has low cost and strong universality.

The application provides an optically active polydiacetylene film and a preparation method and application thereof. The preparation method comprises the following steps: forming a nanowire array on a substrate, which comprises a first nanowire layer and a second nanowire layer arranged in sequence in a direction away from the substrate, and the nanowires contained in the first and second nanowire layers have a non-zero torsion angle; depositing an achiral diacetylene monomer on the nanowire array, removing the nanowire array to obtain a diacetylene monomer crystal layer; and irradiating the diacetylene monomer crystal layer with ultraviolet light to make it polymerize to form a helical polydiacetylene chain, thereby obtaining the optically active polydiacetylene film. The method provided by the application forms stereoregulated diacetylene crystals through the heteroepitaxy effect of the twisted stacked nanowire array, and only needs to be irradiated with ultraviolet light to initiate the asymmetric polymerization of diacetylene, thereby solving the problems that the crystal structure is difficult to be regulated as required and an exogenous chirality needs to be introduced in the prior art.

The invention discloses a wavelength-controlled circular dichroism achiral metasurface and a design method thereof, and belongs to the technical field of electromagnetic wave phase and amplitude regulation and control. The wavelength-controlled circular dichroism achiral metasurface comprises a bottom-layer metal reflecting layer, a substrate dielectric layer, a middle structural layer, a top-layer dielectric layer and a top-layer structural layer which are sequentially stacked from bottom to top, each of the middle structure layer and the top structure layer is composed of a plurality of metastructure units which are periodically arranged, the period length of each metastructure unit is sub-wavelength, and each metastructure unit is of a triple rotational symmetry structure; an achiral structure is adopted by the super-structure surface, the structure is symmetrical, geometric parameters needing to be optimized are fewer, the regulation and control mechanism is more visual, the machining tolerance is high, and the working bandwidth is wider; a triple rotational symmetry structure is adopted as a super-structure unit, and the same surface unit structure of a super-structure plane comprises two triple rotational symmetry structures, so that the circular dichroism can be regulated and controlled by switching the wavelength of incident light.