17 results about "Chiral phase" patented technology

The invention relates to full-dielectric adjustable optical tweezers based on a composite phase superlens, and belongs to the technical field of optical tweezers. Two regulation modes of geometric phase and transmission phase are integrated into a dielectric metasurface periodic structure, and a circular lens surface is combined according to a specific mapping and arrangement mode. The super lens can excite two different output electric fields under the input of linearly polarized light due to the regulation and control of a composite phase, and the two electric fields can independently exist under the input of circularly polarized light with opposite chirality. Therefore, by adjusting the polarization type of the incident light source of the super lens, free switching of multiple optical capturing modes of particles in a field can be realized. Compared with the existing optical tweezers, the control mode can be flexibly adjusted on the premise that the structure of the device is not changed, and more diversified particle capturing requirements can be met. The high-flexibility and easy-to-integrate micro-nano structure can provide powerful guarantee for the performance of a compact composite optical capturing device.

The application belongs to the technical field of chiral catalysis and medicine, and particularly relates to a dendritic chiral phase transfer catalyst, a structural formula of which is shown as formula (I) or formula (II). A series of chiral phase transfer catalysts based on soluble dendritic macromolecules are synthesized by changing the number of repeated carbon chains on the core molecular structure, and it is found through catalyzing asymmetric alkylation of amino acid derivatives that the dendritic chiral phase transfer catalysts provided by the application have excellent yield and enantioselectivity in catalyzing preparation of chiral amino acid derivatives.

The invention discloses an N-alkoxy quaternary ammonium salt chiral catalyst which can be used as a hydrogen atom transfer reagent and a catalyst for free radical reaction to mediate C-C bond coupling and alkylation reaction. A series of N-alkoxy quaternary ammonium salt chiral hydrogen atom transfer reagents are synthesized for the first time by introducing alkoxy on a chiral quaternary ammonium salt catalytic central nitrogen atom of a binaphthalene skeleton. Compared with a chiral binaphthalene skeleton-based chiral phase transfer catalyst (a catalytic center nitrogen atom is connected with an aliphatic carbon chain or aromatic carbon) developed by an applicant in an earlier stage, the catalyst provided by the invention has the advantages that alkoxy is introduced to the catalytic center N atom, so that the N atom is directly connected with an oxygen atom, and the electronic effect and bond breaking mode of the catalytic center are changed; a quaternary ammonium salt chiral catalyst participates in a free radical reaction instead of participating in an ionic reaction traditionally, C-C bond coupling which is difficult to complete under the ionic reaction condition is achieved, and a feasible scheme is provided for C-C bond construction and alkylation based on free radical chemistry.

The present application relates to a method for identifying chiral flavor substances based on covalent organic framework nanochannels, which belongs to the technical field of chiral substance identification and nanochannel analysis. The identification method comprises the following steps: synthesizing a covalent organic framework (COF) membrane by an interfacial polymerization method; preparing Chiral-AuNPs with good chiral signals; using the COF membrane as a nanochannel and the Chiral-AuNPs as a recognition unit to convert weak chiral interactions into nanoscale aggregation behavior, thereby hindering the transmission of ions in the COF nanochannel and achieving the purpose of distinguishing chiral substances. A new type of label-free biomimetic chiral nanochannel sensing platform is constructed for the identification of flavor substance enantiomers. The present application utilizes pure COF membrane as a nanochannel and can be applied to medicine, food testing and environmental science. Compared with other chiral recognition methods, it has the advantages of high sensitivity, simple operation, low cost and good economy.

The application discloses a kind of N-alkoxy quaternary ammonium salt chiral catalyst, can be used as hydrogen atom transfer reagent and catalyst of radical reaction, mediate C-C bond coupling and alkylation reaction.The alkoxyl group is introduced on the chiral quaternary ammonium salt catalytic center nitrogen atom of binaphthyl skeleton, and a series of N-alkoxy quaternary ammonium salt chiral hydrogen atom transfer reagent is synthesized for the first time.Compared with the chiral phase transfer catalyst based on chiral binaphthyl skeleton (catalytic center nitrogen atom is connected with aliphatic carbon chain or aromatic carbon) developed by applicant earlier, the catalyst of the application introduces alkoxyl group on catalytic center N atom, so that N atom is directly connected with oxygen atom, changes the electronic effect and bond breaking mode of catalytic center, changes the traditional participation of quaternary ammonium salt chiral catalyst in ionic reaction into participation in radical reaction, realizes the C-C bond coupling difficult to complete under ionic reaction condition, and provides a feasible scheme for C-C bond construction and alkylation based on radical chemistry.

The invention discloses a spinning terahertz nano oscillator and a chiral regulation and control method thereof. The method comprises the following steps: under the action of a femtosecond laser chiral electric field, inducing an antiferromagnetic layer of a spin terahertz nano oscillator to generate a light-spin orbital moment; the optical-spin orbit moment drives the oscillation of the antiferromagnetic magnetic moment to form spin polarization, and the polarized spin current is converted into a charge current and is radiated to obtain a terahertz signal of the antiferromagnetic frequency related to chirality. The circular polarization femtosecond laser is used for exciting generation of out-of-plane polarization spin in antiferromagnetic metal, radiation of antiferromagnetic terahertz nano oscillation electromagnetic waves is achieved, and the spin terahertz nano oscillation radiation source has the advantages of being fast in response, easy to prepare and capable of working at the room temperature.

Embodiments of the present application provide a light-emitting device, a display device and an electronic device, and relate to the technical field of optoelectronics. The light-emitting device comprises a hole transport layer, the hole transport layer comprises a first chiral light-emitting material having a first chiral structure and a second chiral light-emitting material having a second chiral structure, the chirality of the first chiral structure is opposite to the chirality of the second chiral structure, and the light-emitting device emits circularly polarized light; the light-emitting asymmetry factor glum of the hole transport layer satisfies: glum = 2 x |I S - R S R ‑2 ; wherein, I S represents the intensity of first polarized light emitted by the light-emitting device when the hole transport layer is formed by the first chiral light-emitting material, I R represents the intensity of second polarized light emitted by the light-emitting device when the hole transport layer is formed by the second chiral light-emitting material, and the rotation directions of the first polarized light and the second polarized light are opposite. Thus, the light-emitting efficiency of the light-emitting device can be high.​​​

The present invention discloses a C2 symmetric chiral metasurface and its application and verification method for phase control, belonging to the field of micro-nano optics. It includes a surface layer, an intermediate layer, and a backplane layer arranged in sequence from top to bottom. The surface layer is composed of a left arc ring and a right arc ring arranged centrosymmetrically. On the opposite sides of the left arc ring and the right arc ring, there are protrusions, and the protrusions on the left arc ring and the protrusions on the right arc ring are arranged symmetrically about the center of the circle. The notch central angle β of the left arc ring and the right arc ring is an obtuse angle. By adopting the above C2 symmetric chiral metasurface and its application and verification method for phase control, the spin decoupling phase control of co-polarized circularly polarized terahertz waves can be realized only through chiral phases by using superatoms without mirror symmetry and having second-order rotation (C2) symmetry and their mirror atoms.

The application belongs to the field of preparing chiral amino acids, and particularly relates to a method for catalytically synthesizing S-2,6-dimethyl tyrosine derivatives by using a chiral phase transfer catalyst. A compound of formula S11 is prepared by a nucleophilic substitution reaction of a compound of formula S10 and a compound of formula S5, and then a deprotection reaction is performed to prepare S-2,6-dimethyl tyrosine derivatives. In the nucleophilic substitution reaction, a novel chiral phase transfer catalyst with high efficiency is used, and the structural formula is as follows:

The application belongs to the technical field of light emitting diodes, and discloses a high-polarization circularly polarized light emitting diode, a preparation method and application thereof. The circularly polarized light emitting diode comprises, from bottom to top, a bottom reflective electrode arranged on the surface of a first substrate, a light emitting unit, a top transparent electrode, and a Bragg reflection layer. The material for preparing the Bragg reflection layer is cholesteric liquid crystal. The bottom reflective electrode and the Bragg reflection layer form a Bragg-mirror reflection microcavity structure, and the Bragg reflection layer selectively reflects and outputs circularly polarized light with the same chirality. The Bragg-mirror reflection microcavity is used for chirality selection, and the microcavity structure reverses the optical rotation of light with non-target optical rotation, thereby breaking through the problem of serious light loss of a traditional external polarizer. The microcavity structure utilizes the Bragg-mirror reflection optical microcavity polarization regulation mechanism, so that the light emitting diode does not depend on the intrinsic chirality, spin polarization or special orientation of the light emitting material, and can be applied to various light emitting systems.

This invention discloses an N-N axial chiral phase-transfer catalyst, its synthesis method, and its applications, belonging to the field of asymmetric catalytic synthesis technology. Using chiral 2,4-pentanediol and N-Boc-indolephenol as starting materials, this invention efficiently constructs an N-N axial chiral biscarbazole cyclic ether skeleton through a five-step reaction involving Mitsunobu etherification, deBoc protection, PIDA oxidative cyclization, radical bromoxymethylation, and intramolecular quaternization. This method eliminates the need for complex chiral resolution and noble metal coupling, employs mild reaction conditions, uses readily available and inexpensive starting materials, achieves high overall yield, and yields a product with an axial chirality ee value ≥98%. The resulting catalyst possesses excellent conformational rigidity, chiral induction ability, and phase-transfer performance, exhibiting broad substrate applicability. It also possesses bisindole ring bioactivity, making it widely applicable in asymmetric catalytic synthesis in pharmaceuticals, fine chemicals, and other fields, and providing new directions for the development of antibacterial and antitumor biomaterials.

The invention discloses a method for inducing dynamic quantum phase change by adopting a chiral phase, and belongs to the technical field of dynamic quantum phase change methods, the chiral phase is introduced under the condition of reverse quenching in quantum superconducting bits, and the dynamic quantum phase change can be successfully observed from the chiral phase, which is not proposed by people at present. In the prior art, when quenching kinetics is constructed, the kinetics quantum phase change can be observed only by considering forward quenching, or the kinetics quantum phase change phenomenon cannot be observed by reverse quenching, and in the method, the kinetics quantum phase change is induced during reverse quenching in a phase introduction mode.

The invention discloses synthesis and application of a chiral isothiourea catalyst, and relates to the technical field of chiral chemistry and asymmetric catalytic synthesis. The method comprises the following steps: S1, starting from amino-substituted racemic cyclophane 1a, reacting with thiophosgene under the action of alkali to generate an intermediate 1b; s2, condensing the intermediate 1b with chiral amino alcohol to generate an intermediate 1c; s3, carrying out ring closing under the condition of bromine to generate an intermediate 1d; and S4: carrying out ring closing on 1d under the conditions of alkali and a carboxyl activation reagent to generate an isothiourea catalyst 1, and finally, carrying out conventional column chromatography separation to obtain chiral isothiourea catalysts with different configurations. According to the invention, planar chirality in cyclosimulation and central chirality in amino alcohol are fused to develop a series of isothiourea catalysts with dual chiral elements of planar chirality and central chirality, and the isothiourea catalysts are applied to alpha-site asymmetric fluorination of high-stability carboxylic acid compounds; the rapid and effective synthesis of the alpha-fluorocarboxylic ester compound with optical activity is realized.

This invention discloses a bipyrrole-based axially chiral phase transfer catalyst, its preparation method, and its application, belonging to the technical field of axially chiral phase transfer catalysts. The axially chiral compound (S)-1,9-diphenyl-5-((S)-1-phenylethyl)-5,6-dihydro-4H-dipyrrolo[1,2-b:2',1'-g][1,2,5]triazacycloheptane-3,7-dicarboxylic acid diethyl ester is used as a nucleophile to attack the partially positively charged carbon atom in the benzyl bromide reagent, replacing its bromide ion to generate a quaternary ammonium ion intermediate. The bromide ion attack causes the C-N bond to break, and the phenylethyl group on the quaternary ammonium ion intermediate detaches, forming a chiral tertiary amine with a benzyl group. Subsequently, it undergoes a quaternization reaction with excess benzyl bromide to obtain the chiral phase transfer catalyst. The prepared catalyst exhibits good catalytic activity in the [3+2] cycloaddition reaction of 2-(morpholine-4-carbonyl)allyl benzenesulfinate with phenylacryloylbenzene. The preparation method is simple and has broad application prospects.

The invention discloses a chiral stationary phase based on a chiral metal covalent organic polymer and a preparation method thereof.The chiral stationary phase is prepared from the chiral metal covalent organic polymer and monodisperse aldehyde modified crosslinked polystyrene microspheres, the chiral metal covalent organic polymer and the monodisperse aldehyde modified crosslinked polystyrene microspheres are connected through an imidazole group generated through a Debus-Radziszewski reaction, and the chiral stationary phase is prepared through a one-step reaction. According to the chiral stationary phase, a monodisperse aldehyde group modified crosslinked polystyrene microsphere is taken as a core, a chiral metal covalent organic polymer is taken as a shell layer, and a hexa-coordination chiral ruthenium complex with an octahedral coordination configuration is taken as a chiral recognition active site; a three-dimensional infinitely extended network porous structure generated by the chiral complex and polyaldehyde through Debus-Radziszewski reaction is used as a chiral environment, chiral interaction is provided from microscopic and macroscopic levels, and the chiral complex can be combined with technologies such as solid-phase extraction and liquid chromatography to realize separation of enantiomers.

The application provides a chiral phase transfer catalyst as well as a preparation method and application thereof, belongs to the technical field of organic chemistry, and has a wide market application prospect in the application of the chiral phase transfer catalyst to Michael addition [3+3] asymmetric cyclization reaction and asymmetric catalysis. Moreover, the preparation method of the chiral phase transfer catalyst has strong operability, a novel synthesis route and high yield.

The present invention discloses an antisymmetric chiral metasurface and its applications and verification methods for phase and amplitude regulation, belonging to the field of micro-nano optics. It includes a surface layer, an intermediate layer, and a backplane layer arranged in sequence from top to bottom. The surface layer is composed of a left semi-circular ring and a right semi-circular ring. At both ends of the side of the left semi-circular ring facing the right semi-circular ring, they are bent towards the center of the circle to form a first protrusion and a second protrusion. One end of the side of the right semi-circular ring facing the left semi-circular ring is bent towards the center of the circle to form a third protrusion. The third protrusion and the first protrusion are symmetrically arranged with respect to the center of the circle, and the length of the third protrusion is equal to the length of the first protrusion. The length of the first protrusion is greater than the length of the second protrusion. By adopting the above antisymmetric chiral metasurface and its applications and verification methods for phase and amplitude regulation, by breaking the C2 (second-order rotation) symmetry and mirror symmetry, not only can spin-decoupled phase control be achieved through chiral phases, but also the amplitude of the reflected wave can be adjusted using circular dichroism.