5 results about "Chiral phase" patented technology

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.

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.

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.