35 results about "Photoisomerization" patented technology

The invention relates to the technical field of biological materials, in particular to a pillararene-based photoresponse MOF-based ion gating nanochannel and a preparation method thereof. According to the pillararene-based photoresponse MOF-based ion gating nano-channel, a bullet-shaped nano-channel is prepared by taking PET (Polyethylene Terephthalate) as a substrate, and the substrate can provide structural support; p5A-MOF-1 based on pillararene is used as a core functional layer, and the core functional layer can provide a stable cavity environment; a P5A-MOF-1 cavity is filled with an organic aromatic azo compound, so that the light response structure change is realized. And the effective volume of the P5A-MOF-1 cavity is regulated and controlled through the photoisomerization effect of the azo group, so that precise gating of ion transmission is achieved. The preparation method provided by the invention is simple and convenient to operate, mild and controllable in condition and beneficial to large-scale production.

This invention provides a highly thermally stable, photoresponsive α-diimine nickel complex, its synthesis method, and its applications, aiming to develop novel olefin polymerization catalysts with both excellent thermal stability and photoresponsive properties. The core photoresponsive switch of this type of nickel complex is a rigid diphenylethylene derivative, which can achieve reversible photoisomerization of the E / Z configuration under 365 nm and 405 nm ultraviolet light irradiation: the E configuration has a relatively open coordination environment; after light irradiation, the Z configuration has a more compact spatial structure, which can form a dual regulatory mechanism: steric hindrance and potential metal-aryl π interactions. Due to this dual regulatory mechanism, the complex exhibits excellent thermal stability at 150 °C. o Even at high temperatures, it still maintains a high value of 0.8 × 10⁻⁶. 6 g·mol ‑1 ·h ‑1 The nickel complex of this invention exhibits enhanced catalytic activity and effectively inhibits chain transfer and chain walking reactions during high-temperature polymerization. By synergistically enhancing thermal stability through configurational tautomerism, and possessing both photoresponsive properties and high catalytic activity, it holds significant research value and broad application prospects in the precise synthesis of functionalized polyolefin materials.

The invention discloses a series of photoinduced isocompounds based on an alpha-cyano diarylethene skeleton as well as a preparation method and a metal ion regulation mechanism of the photoinduced isocompounds. The photoinduced isomeric compound is prepared through Knoevenagel condensation reaction by taking alpha-cyano diarylethene as a basic skeleton structure, the structural general formula of the photoinduced isomeric compound is shown in the specification, and the photoinduced isomeric compound is named as a hydroxyl-containing alpha-cyano diarylethene aromatic derivative. The photoinduced isomerization compound disclosed by the invention has good polarity sensitivity and photoinduced isomerization capability, and Z / E isomerization can be realized under the irradiation of ultraviolet light. The addition of metal ions is not a fluorescent response trigger factor, but can effectively adjust the photoresponse degree and rate of the photoinduced isocompound. The synthesis method of the photoisomerization compound is simple, the product is easy to purify, the optical property caused by photoisomerization can be regulated and controlled through coordination of polarity and metal ions, and an effective strategy is provided for designing a high-performance optical function material and application thereof.

The invention discloses a photoisomerization method of carotenoid, which comprises the following steps: dispersing high cis carotenoid in an organic solvent, carrying out photoisomerization in an illumination kettle until the proportion of all-trans carotenoid is not obviously increased, cooling, crystallizing, and filtering to obtain carotenoid solid with high all-trans proportion, and the filtrate sleeve is used as a solvent for next batch of isomerization. The isomerization method has the characteristics of mild conditions, high efficiency, controllability, cleanness and the like, accords with green chemistry and sustainable development concepts, and is simple in isomerization extraction operation, high in extraction yield and suitable for large-scale implementation.

The invention belongs to the technical field of organic electronics, and discloses a preparation method of an indanone-based photoresponse organic molecule and application of the indanone-based photoresponse organic molecule in the field of organic single-molecule wires. The indanone-based photo-responsive organic molecule has a structure shown as I-II as shown in the specification, and through-bond coupling (TBC) and through-space coupling (TSC) channels of the indanone-based photo-responsive organic molecule can be regulated and controlled through molecular structure engineering. By means of introducing electron donating / withdrawing groups into molecules, adjusting the length of a pi-conjugated chain, introducing steric hindrance and the like, the molecules are subjected to reversible photoisomerization under ultraviolet irradiation, and meanwhile, adjustment of a charge transfer channel can be realized at a single molecule level. The preparation method is simple and applicable, and has a good application prospect in the field of organic monomolecular wires.

The application relates to an electrowetting pixel unit, a display panel and a control method, the electrowetting pixel unit comprising a first cavity, the first cavity being filled with an electrolyte solution and translucent ink; a transparent insulating layer having a hollow second cavity, the second cavity being filled with a photoisomerization particle solution; the photoisomerization particle solution can change color under irradiation of light of a preset wavelength, and the translucent ink can prevent light of the preset wavelength in an external light source from passing through when spreading on a hydrophobic film layer. The electrowetting pixel unit provided by the application is filled with the photoisomerization particle solution in the second cavity, the photoisomerization particle itself has color, and can change color under irradiation of light of a preset wavelength, so that the richness of color display can be improved, the translucent ink can prevent light of the preset wavelength in an external light source from passing through when spreading on the hydrophobic film layer, and the reliability of the electrowetting pixel unit in improving the richness of color display through the photoisomerization particle solution can be ensured.

The invention relates to a synthetic method of didrogesterone. According to the method, progesterone is subjected to ketalation, halogenation, elimination, illumination isomerization, deprotection and final isomerization, and the didrogesterone is obtained. The method has the advantages of high yield, cheap and easily available raw materials, green and safe whole process route, high bulk drug quality and purity of 99.8% or more, and is suitable for industrial production.

The invention belongs to the technical field of solar-blind ultraviolet light detection materials, and relates to a full-flexible solar-blind ultraviolet light detection material and a preparation method and application thereof, and the full-flexible solar-blind ultraviolet light detection material comprises a down-conversion luminescent material, an azobenzene polymer and a piezoelectric polymer. The excitation-emission characteristic of the rare earth doped down-conversion particles is utilized, a light absorption window of azobenzene elements and the wavelength conversion characteristic of the down-conversion light-emitting particles are accurately matched, high-energy solar-blind ultraviolet light is converted into low-energy long-wave ultraviolet light capable of enabling azobenzene molecules to generate photoisomerization, an azobenzene polymer is driven to generate photoisomerization, and the light-emitting efficiency of the azobenzene polymer is improved. The film fiber network is driven to microscopically shrink and the piezoelectric polymer is excited to output an electric signal; the operation is simple and convenient, the fiber film composite material with a microstructure can be continuously manufactured in a large area, and the preparation of the large-area, fast-response and high-stability intrinsic flexible solar-blind ultraviolet detection material and the device thereof is realized.

The application provides a kind of light regulated liquid crystal material composition and its preparation method, belongs to light regulated liquid crystal technical field, preparation method includes with docosyl-tetramethyl piperidinol propylene acid ester, (3-acryloyloxy-2-hydroxy propoxy propyl) end-capped polydimethylsiloxane, cyano biphenyl hexyl acrylate and other raw materials preparation adjuvant, nematic liquid crystal monomer, photoisomerization functional monomer, dynamic covalent crosslinking agent, photoinitiator and the mixed liquid consisting of cyclohexanone and propylene glycol methyl ether acetate are under the condition of controlled temperature, rotation speed and vacuum degree, low-speed stirring, high-speed shearing dispersion and vacuum degassing curing are carried out, to obtain light regulated liquid crystal material composition, the application is through the adjuvant design and the one-step method mixing process of simplification, the contradiction between material dynamic response performance and long-term stability is solved, the prepared composition shows millisecond level fast light response, high optical contrast, photo-induced deformation and good cycle durability after film curing.

The invention relates to the technical field of compound synthesis, in particular to (Z)-p-toluenesulfonyl hydrazone derivatives and a preparation method thereof. The (E)-p-toluenesulfonyl hydrazone derivative, a photosensitizer and a solvent are mixed and react under illumination to obtain the (Z)-p-toluenesulfonyl hydrazone derivative. The photosensitizer selected by the method is green and low in cost, free of heavy metal residues, wide in substrate application range, high in isomerization efficiency, short in reaction time and good in cis-product stability, the system is easy for amplified production, the high-purity hydrazone compound and the photoisomerization product thereof can be efficiently, mildly and greenly prepared, and the method is suitable for industrial production. The application potential in the fields of drug synthesis, precise drug delivery and functional materials is obviously improved.

The application belongs to the technical field of fluorescent analysis and detection, and particularly relates to a tridentate Schiff base compound and a preparation method and application thereof. 2 The formylhydrazine Schiff base compound is widely applied in coordination chemistry, and a parent structure thereof can be used to better study the transformation of a complex under light stimulation, and the imino group also has good photoisomerization performance, at this time, the light stimulation can catalyze the ligand to produce more rich coordination modes, so the isomerization phenomenon of the compound under the action of ultraviolet light is tested, and the application of the compound in a colorimetric chemical sensor is studied. Further research is conducted on whether the compound has different ion selectivity after the conversion configuration under the action of ultraviolet light and the change of the coordination mode, and finally, the complex of the ligand Ni 2+ , Cu 2+ metal is synthesized.

A fiber having a polymer sheath and a core. The core has a liquid crystal and a compound capable of photoisomerization, such as that shown below. A method of: providing a first solution of a polymer, providing a second solution of a liquid crystal and compound capable of photoisomerization, and electrospinning the first solution and the second solution to form the fiber.

The present invention provides a means which is capable of suppressing a decrease in transparency in a transparent state under high temperature conditions in a liquid crystal light control element in which light scattering properties are increased by receiving ultraviolet light and the light scattering properties are decreased by receiving visible light. The present disclosure relates to a liquid crystal light control element that comprises: a pair of transparent substrates which each have a transparent electrode and an alignment function layer that is disposed on one surface of the transparent electrode, and which are arranged so that the alignment function layers face each other; and a liquid crystal layer which contains liquid crystal molecules, a photoisomerization material, a non-photoresponsive chiral compound, and a polymer of a photopolymerizable monomer, and which is interposed between the pair of transparent substrates. The light scattering properties of the liquid crystal light control element are increased by receiving ultraviolet light, and the light scattering properties are decreased by receiving visible light. The liquid crystal light control element is characterized in that the average diameter of voids contained in the polymer of the photopolymerizable monomer in a cross section in the plane direction of the liquid crystal layer is smaller than the theoretical value of the helical pitch of the liquid crystal molecules caused by a temperature change from 27°C to 70°C of the helical twisting power (HTP) of the non-photoresponsive chiral compound.

This invention discloses a process and active carrier catalyst for the catalytic synthesis of acetyl empagliflozin. The process utilizes a yeast cell wall-mediated active carrier nickel-phosphorus composite catalyst. The catalyst is activated in a water / glycerol mixed solvent via microwave-ultrasound dual-field synergistic activation, catalyzing the reaction of compound 5 with compound 4 to obtain compound 3. In a supercritical CO2 / ionic liquid system, leveraging the photoisomerization properties of spiropyran-quaternary ammonium iodide, under low-voltage electrocatalysis and UV-Vis switching conditions, the directional glycosylation reaction of compound 3 with compound 2 is achieved to obtain compound 1. This invention utilizes the porous structure and functional groups of the yeast cell wall to stabilize nano-nickel-phosphorus particles, improving catalytic efficiency and reusability. Through the synergistic guiding effect of photoresponsive molecules and ionic liquids, high selectivity of the reaction is achieved. The entire process uses green solvents, and a closed-loop catalyst recovery process is established, offering advantages such as environmental friendliness, low cost, and high product purity.

The purpose of the present invention is to improve a response speed from a transparent state to a screen state in a liquid crystal dimming element in which light scattering is increased by receiving ultraviolet light and light scattering is reduced by receiving visible light.　A liquid crystal dimming element according to the present invention comprises: a pair of transparent substrates that each have a transparent electrode and an alignment function layer disposed on one surface of the transparent electrode, and that are disposed such that the alignment function layers face each other; and a liquid crystal layer that includes liquid crystal molecules, a photoresponsive material containing a photoisomerization material, and a polymer of a photopolymerizable monomer, and that is interposed between the pair of transparent substrates, wherein light scattering is increased by receiving ultraviolet light and light scattering is reduced by receiving visible light. The liquid crystal dimming element is characterized in that an angle ϴ [°], formed by an axial direction of an orientation force in which the alignment functional layer acts on the liquid crystal molecules and an axial direction of an orientation force in which the polymer of the photopolymerizable monomer acts on the liquid crystal molecules, satisfies 0<ϴ≤90.

The invention relates to biological application of binary system triplet-triplet annihilation up-conversion luminescence in Schiff base controllable photoisomerization based on a sleeve device, a binary up-conversion system is constructed through regulation and control of a photosensitizer and an annihilation agent, near-infrared light or long-wavelength visible light is converted into short-wavelength blue light, Trans-to-Cis isomerization of Schiff base is triggered, and reactive oxygen species are synchronously generated. An inner-outer double-layer sleeve closable structure is innovatively adopted, accurate regulation and control of the photosensitizer-annihilation agent proportion and independent separation of a substrate are achieved, the technology breaks through the biological penetration limitation of a short-wavelength light source, and a novel light-activated prodrug release strategy is provided for tumor targeted therapy.

The present application relates to the technical field of biological materials, and particularly relates to a pillar arene-based photoresponsive MOF-based ion gate nano-channel and a preparation method thereof. The pillar arene-based photoresponsive MOF-based ion gate nano-channel is prepared by taking PET as a substrate to prepare a bullet-shaped nano-channel, the substrate can provide structural support; taking a pillar arene-based P5A-MOF-1 as a core functional layer, the functional layer can provide a stable cavity environment; filling an organic aromatic azo compound in the cavity of the P5A-MOF-1 to realize a photoresponsive structural change. The effective volume of the cavity of the P5A-MOF-1 is regulated through photoisomerization of the azo group, and then precise gating of ion transmission is achieved. The preparation method is simple in operation, mild and controllable in conditions, and is conducive to large-scale production.

The utility model discloses a device for measuring photoinduced isomerization molecule capacitance, which comprises a main body structure, a capacitance pool and a cover, the cover is provided with a probe and is connected with an external lead, a groove is arranged in the main body structure, the capacitance pool is accommodated in the groove, the capacitance pool is used for accommodating a sample solution containing photoinduced isomerization molecules to be measured, and the probe is arranged in the groove. The cover which is provided with the probe and is connected with the external lead is used for sealing the groove and measuring the capacitance of the sample solution; a groove is formed in the bottom of the capacitance pool, a through hole is formed in the bottom of the groove, a light-transmitting area is arranged at the bottom of the capacitance pool, the position of the through hole corresponds to that of the light-transmitting area, and the through hole is used for enabling light of an external light source to penetrate through the light-transmitting area to irradiate the sample solution in the capacitance pool. According to the utility model, solution capacitance change caused by molecular isomerization before and after illumination can be accurately captured.

Disclosed herein is a fiber having a sheath including a polymer and a core including a non-cholesteric liquid crystal. The sheath is transparent to visible light. The fiber may an average diameter of no more than 10 microns, and at least 90% of the fiber has a diameter within 20% of the average diameter. The sheath may include a compound capable of photoisomerization that extends into the core. The interference color of the fiber may be reversibly changed by exposure to light or a temperature change.

This invention belongs to the field of new materials technology, and more specifically, relates to an alkoxytriphenylamine conjugated modified dithienylethylene derivative and its applications. The dithienylethylene derivative has structural units as shown in formula (I): wherein R1O and R2O are each independently a C1-C4 alkoxy group, and Ar is a C6-C4 alkoxy group. 14 The aryl group. The alkoxytriphenylamine-modified dithienylethylene molecular switch designed in this invention has an absorption wavelength red-shifted to the visible light region, so that the ring-closing reaction can be driven by visible light, while the ring-opening reaction itself is driven by long-wavelength visible light. This achieves full visible light control of the dithienylethylene molecular switch and has strong and efficient visible light responsiveness and remarkable photoisomerization conversion rate.

This invention discloses a photo-switching organoiridium metal complex, its preparation method, and its applications, belonging to the field of photoisomerization materials technology. This invention involves forming an N^N ligand through a Sonogashira coupling reaction between alkynyl spiropyran and phenanthroline, and finally coordinating with a bridging ligand to form a photo-switching organoiridium metal complex. This photo-switching iridium metal material combines nonlinear optical materials with photoisomerizing spiropyran molecules, exhibiting excellent optical limiting performance, good photothermal stability, photoisomerization characteristics, fatigue resistance, bleaching resistance, and excellent laser protection performance. Furthermore, after ultraviolet irradiation, the expansion of the complex's conjugation degree due to the ring-opening of the spiropyran molecule further enhances its laser protection performance.

Highly reversible supramolecular photoswitching system with macrocycle-mediated photoinduced emission enhancement, preparation and application in targeted cell imaging and anti-counterfeiting. A supramolecular photoswitching system self-assembly with photo-induced crystallization, emission enhancement and assembly-activated emission enhancement photoactivation mechanism was developed using supramolecular assembly, and further assembled with HACD. Due to the reversible photoisomerization characteristics and efficient AIE characteristics of DAE units, the luminescence of DAE-CO can be reversibly turned on / off. Under the stimulation of light, DAE-CO tends to self-aggregate into larger aggregates with emission enhancement characteristics, and this enhancement can be gradually increased by alternating irradiation in several UV / NIR cycles. Like DAE-CO, and both have the characteristics of luminescence adjustment and photo-induced aggregation emission enhancement. In addition, we have applied these supramolecular luminescent materials to information encryption and targeted, light-controlled tumor cell imaging.

A diastereomer preparation method that produces a desired diastereomer from a diastereomer mixture with high efficiency; and a solid-phase photosensitizer which is used in the method. In the method, one diastereomer among cis-trans isomers is selectively prepared utilizing recycle HPLC. The method includes a step A that is a separation step for introducing a cis-trans isomer mixture into the separation column to selectively collect one diastereomer; a step B that is a photoisomerization reaction step for irradiating a solution containing the other diastereomer which is obtained after the step A or C with light in the presence of a photosensitizer in a photoisomerization reactor to induce a photoisomerization reaction; and a step C that is a step for introducing a cis-trans isomer mixture produced in the step B into a separation column to selectively collect the one diastereomer.

The application relates to the technical field of photosensitive polymer synthesis, and discloses a photosensitive monomer, a photosensitive polyurethane and a preparation method and application thereof. The photosensitive monomer is prepared by reacting 5-hydroxy-2-nitrobenzaldehyde with a compound M and a compound N capable of accepting external electrons in a first polar solvent. The photosensitive monomer has high crosslinking activity, can be combined with isocyanate to synthesize polyurethane holographic polymer materials, and can endow the polyurethane holographic polymer materials with physical crosslinking photoisomerization performance. The pyridine structure generated under ultraviolet irradiation can not only form intermolecular hydrogen bonds with hydrogen-containing structures in the molecular chain to realize reversible crosslinking, but also can produce complexation with metal ions. The photosensitive monomer can widen the selection range of photosensitive monomers required for the production of holographic polymer materials, and effectively promote the development of holography. The photosensitive monomer has simple synthesis process, high yield, easy separation of products, high controllability, and can realize low-cost continuous production.

The application discloses an azobenzene-based heterochain fluorescent polymer and a preparation method and application thereof, and relates to the technical field of heterochain polymer luminescence. The method uses azobenzene epoxide alkane as raw material, and obtains the azobenzene-based heterochain fluorescent polymer through bulk polymerization, melt polymerization or solution polymerization under the action of a catalyst; the azobenzene-based heterochain fluorescent polymer obtained by the method has good solubility in various organic solvents, and the luminescence property of the polymer can be changed by adjusting the concentration and inducing photoisomerization of the azobenzene group, so that the azobenzene-based heterochain fluorescent polymer has good application potential.

The application provides a detection method of single-molecule fluorescent protein photoisomerization, wherein a prepared solid-state nanopore membrane is loaded into a detection platform, a GFP test sample is dissolved in a buffer solution, and a sample obtained by irradiating the solution under a visible light source and a sample obtained by irradiating the sample under the visible light source again under an ultraviolet light source are added into a detection cell, electrical signals of the GFP sample obtained under the visible light source and under the visible light source / ultraviolet light source alternating irradiation are collected respectively, and differences of the two kinds of electrical signals are analyzed. The application can obtain information of a molecular size, a surface charge polarity and a shape of a protein by analyzing differences of ion blocking current amplitude, translocation time and pore blocking rate and changes of a molecular perforation orientation of the green fluorescent protein entering the nanopore due to surface charge distribution and conformational changes of protein isomerization under the electrical method and bias voltage.

The invention discloses a Schiff base photochromic chiral compound material as well as a preparation method and application thereof, and a novel chiral Schiff base compound with a photoisomerization reaction is obtained through a Schiff base reaction on the basis of a salicylaldehyde derivative and chiral ammonia. The synthesis steps of the chiral organic photochromic compound are simple and efficient; the prepared intelligent color-changing material has good color-changing ability in a solid state, has special chiral response, can still keep a large color-changing range in a pure solid state, and has wide potential application in the fields of organic light-emitting diodes, chiral photoelectric information storage, intelligent optical switch devices and the like.

The present invention relates to a process comprising isomerizing nerolaldehyde of formula (II) to geranial of formula (I), or isomerizing geranial to nerolaldehyde, characterized in that (a) isomerization is accomplished by irradiation with light. The method according to the invention makes it possible to very efficiently convert undesired isomers, which are unavoidable by-products generated during the production of nerolaldehyde and / or geranial, into desired isomers, the economic benefits of the process for producing desired isomers (in high yields by avoiding cost-intensive distillation and avoiding possible by-products) are thus greatly improved.

The invention relates to the technical field of azobenzene liquid crystal materials, and discloses an azobenzene liquid crystal film and a preparation method and application thereof.The azobenzene liquid crystal film is obtained by dissolving a chiral agent, nematic liquid crystals and azobenzene derivative monomers in a solvent and volatilizing the solvent, and the azobenzene derivative monomers have the structure as follows: R1 is selected from C1-20 alkyl; mixing the liquid crystal solution with the polymer solution for reaction to obtain polymer dispersed liquid crystal; and coating the polymer dispersed liquid crystal on a substrate, and drying to obtain the azobenzene liquid crystal film. The optical isomerization characteristic of azobenzene is used for driving the orientation change of liquid crystal molecules, high optical contrast ratio, high optical response speed and good mechanical stability and long-term use performance are achieved, the non-contact light-operated switch function is achieved, and energy consumption and equipment complexity are reduced.

The invention discloses an application of a star-shaped oligomer in photochromic anti-counterfeiting, and belongs to the technical field of anti-counterfeiting. The star-shaped oligomer disclosed by the invention has a double-peak fluorescence spectrum, and the triphenylamine core structure and the DASA photoresponse unit are subjected to reversible photoisomerization reaction under light stimulation, so that the absorption peak of the star-shaped oligomer in a visible light region is changed, and the displacement and the intensity of a fluorescence emission spectrum are changed, and therefore, dual-mode response of color and fluorescence is realized. And after being dissolved in a polymer solution and poured into a film, the film can be used for constructing an anti-counterfeiting product with a multi-information encryption function. The anti-counterfeiting material provided by the invention is simple and convenient to prepare, quick in response, good in repeatability and suitable for high-security anti-counterfeiting labels and information encryption systems.