37results about How to "Strong fluorescence emission properties" patented technology

The invention discloses a ratio-dependent fluorescent probe for detecting hydrogen peroxide. The ratio-dependent fluorescent probe is an anthocyanin-like derivative, has the chemical structure as shown in the formula (1) and is particularly 2-(3-(7-diethylamino) coumarin)-4-(2-phenmethyl)-7-diethylamino-benzopyran perchlorate. The probe disclosed by the invention is cheap and available, convenient to use, capable of specifically reacting together with hydrogen peroxide to generate a coumarin derivative with stronger fluorescence emission capacity, free of interference from other related oxides in the process of detecting hydrogen peroxide, favorable in hydrogen peroxide selectivity and capable of accurately detecting hydrogen peroxide in living cells.

The invention discloses a near-infrared fluorescent probe for high-selectivity detecting of thiophenol and a synthesis method and application thereof, and belongs to the technical field of chemical analysis and detection. The near-infrared fluorescent probe is obtained by reaction between a dicyanoisophorone-julolidine large pi system and 2,4-dinitrofluorobenzene, and has the following structure (please see the specifications for the structure). Fluorophore of the probe is the dicyanoisophorone-julolidine large pi system, and a response group to thiophenol is 2,4-dinitrophenoxy. Molecules of the probe have high selectivity and sensitivity to thiophenol, the detection range is 1-60 [mu]mol.L<-1>, and the limit of detection is 0.13 [mu]mol.L<-1>. The probe can be used for detecting thiophenol in water bodies, soil and cells.

The invention discloses a near-infrared fluorescent probe for detecting thiophenol and a synthesis method and application thereof, and belongs to the technical field of chemical analysis and detection. The near-infrared fluorescent probe is obtained by reaction between a dicyano-substituted isophorone large pi system and 2,4-dinitrofluorobenzene, and has the following structure (being defined as in the specification). Fluorophore of the probe is the dicyano-substituted isophorone large pi system, and a response group to thiophenol is 2,4-dinitrophenoxy. Molecules of the probe have high selectivity and sensitivity to thiophenol, the detection range is 0.5-10 [mu]mol.L<-1>, and the limit of detection is 23 nmol.L<-1>. The probe can be used for detecting thiophenol in water bodies, soil and cells.

The invention discloses a solid broadband blue-light transmitting organic luminescent material shown in a formula I and a preparation method thereof. R is H or OCH3. Two functional structural units such as the quinoxaline group and the pyridazinone group are effectively combined to form a pyridazinone-type organic luminescent molecule with quinoxaline being functionalized. The two-heterocyclic-ring pyridazinone compound provided by the invention is stable in structure and easy to store, a good ultraviolet absorption property and a strong fluorescent transmitting property in a chloroform solution can be realized, and the solid broadband blue-light transmitting organic luminescent compound is expected to become a novel organic material obtaining the white light. The preparation method is simple, the luminescent material is good in stability and can be used in the fields such as luminescent devices, white light luminescence or fluorescent probes. By adopting the solid broadband blue-light transmitting organic luminescent material and the preparation method thereof, the research and application field of the quinoxaline pyridazinone compound can be enlarged.

A thiophene compound having sulfonyl groups which is represented by the formula [1]. It has high heat resistance and high unsusceptibility to oxidation and can improve solubility and dispersibility in various solvents. [In the formula, R1 and R2 each independently represents hydrogen, halogeno, cyano, etc.; and R3 and R3' each independently represents C1-20 alkyl, C1-20 haloalkyl, phenyl optionally substituted by W, thienyl optionally substituted by W, etc. (W represents chlorine, etc.)].

The invention discloses a fluorescent probe for detecting viscosity and hydrogen peroxide and a synthesis method and application of the probe, and belongs to the technical field of chemical analysis detection. The probe is obtained through a coupling reaction between aldehydic benzothiazole and a 4-methylpyridinium salt substituted by methylene phenylboronic acid. According to the structure of theprobe, due to the quenching effect of twisted intramolecular charge transfer (TICT), a probe molecule has almost no fluorescence emission characteristics. However, with the increase of the viscosityof an environmental system, the TICT effect is inhibited, and the probe molecule achieves strong fluorescence emission with the emission peak of 680 nm. In addition, the probe can also generate sensitive fluorescence response to H2O2, and the emission peak is 590 nm after the reaction. The concentration detection range of hydrogen peroxide is 0-25 Mumol L(-1), and the detection limit is 0.34 MumolL(-1). The probe can be used for detecting H2O2 in water and cells.

The invention discloses a long-wavelength fluorescent probe for detecting hydrazine and a synthetic method and application of the long-wavelength fluorescent probe, and belongs to the technical field of chemical analysis and detection. The probe is obtained through condensation of a tricyanofuran large pi system and acetyl, and comprises the following structure (please see the specifications for the structure), wherein R1 and R2 are selected from any one of alkyl chains with the number of carbon atoms from one to eighteen; n1 is 1, or 2 or 3; and n2 is selected from any one of integers of 0-17. Fluorophore of the probe is of a tricyanofuran large pi system framework structure, and a response group to the hydrazine is a fatty acid unit. Molecules of the probe have high selectivity and sensitivity to the hydrazine, the detection range is 1.0-50 [mu]mol / L<1>, and the limit of detection is 0.13[mu]mol / L<1>. The long-wavelength fluorescent probe can be used for detecting hydrazine in water, soil and cells.

The invention provides a stable method for preparing a nitrogen-doped graphene quantum dot material. The preparation method comprises the following steps: dispersing networked reduced graphene oxide in concentrated nitric acid, and heating in an oil bath to a temperature of 140-160 DEG C while magnetic stirring, and reacting at a constant temperature for 12-48 hours under circulating water condensation; removing circulating condensate water, continuously evaporating at the constant temperature for 2-3 hours, and cooling to a room temperature; adding ultrapure water for ultrasonic dispersion, filtering, performing rotary evaporation and concentration on the filtrate, and filling in a dialysis bag of 3000-8000Da to dialyze for 24-48 hours; and performing rotary evaporation and concentrationon the dialysate again, and performing vacuum freeze drying, thereby obtaining the nitrogen-doped graphene quantum dots. The luminous stability of the nitrogen-doped graphene quantum dot is improved to a certain degree, and complicated passivating treatment and mixed element doping processes in the traditional process of preparing the doped quantum dots are effectively simplified. Moreover, the charge transfer capacity of the quantum dots is effectively improved, and the application potential in more fields such as photoelectricity, biomedicine and the like is facilitated.

The invention discloses a fluorescent probe for detecting cysteine, a synthetic method of the fluorescent probe and an application of the fluorescent probe, and belongs to the technical field of chemical analysis and detection. A benzothiazole phenothiazine fluorogen with green fluorescence emission reacts with 2, 4-dinitrobenzene sulfonyl chloride to obtain the probe which has a general structural formula as shown in the specification. The fluorogen of the probe is benzothiazole phenothiazine, and a cysteine response group is 2, 4-dinitrobenzene sulfonyl. Probe molecules have high selectivityand sensitivity to the cysteine, detection range is 0-10 micromoles*L<-1>, and detection limit is 0.12 micromole*L<-1>. The probe can be used for detecting the cysteine in water, soil and cells.

The invention discloses a fluorescent probe for detecting hydrogen persulfide, a synthetic method of the fluorescent probe and an application of the fluorescent probe, and belongs to the technical field of chemical analysis and detection. A benzothiazole phenothiazine fluorogen with green fluorescence emission reacts with 2-fluoride-5-nitrobenzoic acid to obtain the probe which has a general structural formula as shown in the specification. The fluorogen of the probe is benzothiazole phenothiazine, and a hydrogen persulfide response group is 2-fluoride-5-nitrobenzoate. Probe molecules have high selectivity and sensitivity to the hydrogen persulfide, detection range is 0-8 micromoles*L<-1>, and detection limit is 26 nanomoles*L<-1>. The probe can be used for detecting the hydrogen persulfide in water, soil and cells.

The invention discloses a preparation method of an ultrathin nano belt structure perovskite single crystal. The preparation method comprises the following steps: 1) dissolving AX and PbX2 in a precursor solvent according to a molar ratio of n: 1, heating and stirring to obtain a precursor solution of three-dimensional perovskite APbX3; 2) dropping a proper amount of the precursor solution of the three-dimensional perovskite APbX3 on a substrate, placing the substrate in a vessel containing an anti-solvent, and sealing the opening of the vessel, placing the vessel in a drying oven, and standingto grow the crystal, thereby obtaining the ultrathin strip-shaped perovskite single crystal, wherein AX is selected from one or more of methylamine bromine, formamidine bromine and cesium bromide; Xis a halogen anion, and n is 1-2.2. The optimal light emitting wavelength of the obtained ultrathin perovskite single crystal is 508-512 nm, and low-threshold laser lasing at the room temperature andcontinuous optical pumping laser lasing at the liquid nitrogen temperature are achieved.

The invention discloses a near-infrared fluorescent probe for detecting thiophenol and a synthesis method and application of the near-infrared fluorescent probe, and belongs to the technical field ofchemical analysis and detection. The probe disclosed by the invention is obtained by a reaction between 8-(2, 4-dinitrophenoxy) julolidin-9-formaldehyde and 4-pyridine acetonitrile; the probe has thefollowing structure as shown in the specification; the response group of the probe to thiophenol is 2, 4-dinitrophenoxy, and the probe and thiophenol react to further generate an intramolecular cyclization reaction to generate coumarin fluorescent molecules with strong fluorescence emission, thereby implementing fluorescence detection on thiophenol. The probe molecule has high selectivity and sensitivity to thiophenol, the detection range is 0-12 [mu] mol.L <-1>, and the detection limit is 33 nmol.L <-1>. The probe can be used for detecting thiophenol in water, soil and cells.

The invention discloses a fluorescent probe and a preparation method thereof, the fluorescent probe has a chemical structural formula shown in a formula (1), and the preparation method of the fluorescent probe specifically comprises the following steps: (1) preparing raw materials; (2) dissolving 4-(diethylamino)-2-(2, 4-dinitrophenoxy)-benzaldehyde, pyridylacetonitrile and a catalyst in a solvent, and carrying out a heating reaction for 1-24 h to obtain a mixed solution; and (3) removing the solvent from the mixed solution, and performing separating through a chromatographic column to obtainthe fluorescent probe. The fluorescent probe molecule provided by the invention has good stability and optical properties, high selectivity and high sensitivity, strong thiophenol recognition capability, the high response speed, the wide response range and low detection limit; and according to the preparation method of the fluorescent probe, the used raw materials are easy to obtain, the synthesisyield is high, the reaction conditions are mild, the equipment is simple, and the steps are simple and convenient.

The invention discloses a preparation method of supermolecule composite nano particles. The method comprises the following steps of: dissolving TPE-m-COOH in an organic solvent to obtain a TPE-m-COOH solution; and mixing dendronized polymer Gn PAMAM and the TPE-m-COOH solution in the organic solvent, keeping the concentration of the TPE-m-COOH solution 1*10<-6> to 1*10<-4>M, wherein the molar ratio of amino of Gn PAMAM to carboxyl of TPE-m-COOH is definite, dispersing and standing to obtain the supermolecule composite nano particles. The supermolecule composite nano particles are strong in fluorescence emission performance; compared with tetraphenylethenes derivatives, the supermolecule composite nano particles have the advantages that fluorescence intensity is greatly enhanced, and the supermolecule composite nano particles can be used as novel luminescent materials; the preparation method is simple and mild in condition; and the supermolecule composite nano particles are easy to prepare.

The invention provides synthesis and application of an amphoteric acrylate quaternary ammonium salt fluorescent brightener. The amphoteric acrylate quaternary ammonium salt fluorescent brightener is characterized in that a structural formula of the amphoteric acrylate quaternary ammonium salt fluorescent brightener is a formula I (shown in the description). The invention aims at providing the synthesis and the application of the amphoteric acrylate quaternary ammonium salt fluorescent brightener. A synthesis method is simple; raw materials are low in price; a technology is green and environmentally friendly. Paper treated by adopting the amphoteric acrylate quaternary ammonium salt fluorescent brightener has a higher whiteness value; the amphoteric acrylate quaternary ammonium salt fluorescent brightener is a novel high-performance fluorescent brightener.

The invention provides synthesis and application of a tetrasuphonic sodium ethyl methacrylate hyamine fluorescent whitening agent. The synthesis is characterized in that the structure formula of the tetrasuphonic sodium ethyl methacrylate hyamine fluorescent whitening agent is shown in formula I in the description. The synthesis is simple in method, low in raw material price, and green and environmentally friendly in process; the fluorescent whitening agent is high in whiteness and brightness while being used for processing a calcium carbonate powder filling material; the fluorescent whitening agent is high in mobility and dispersing performance and is a multifunctional material with whitening and surface activating performances.

The invention relates to a method for preparing fluorescent nitrogen-doped carbon nanodots by taking compost humic acid as a raw material. The preparation method comprises the following steps: uniformly mixing humic acid and a hydrogen peroxide aqueous solution at room temperature, carrying out hydrothermal reaction, and naturally cooling to room temperature to obtain a reaction solution; carryingout ultrasonic treatment, centrifugation and separation on the reaction liquid at room temperature to obtain supernatant; enabling the supernatant to pass through a water system microporous filter membrane, dialyzing, intercepting to obtain a carbon nano point aqueous solution with the molecular weight of more than 3500Da, and freeze-drying to obtain the solid nitrogen-doped carbon nanodots. According to the invention, high-value recycling of sludge can be realized, and the provided nitrogen-doped carbon nanodot synthesis method is convenient, green and efficient. The prepared nitrogen-dopedcarbon nanodot has high quantum dot yield and high fluorescence emission and can be applied to rapid detection of metal ions, and shows high selectivity and sensitivity for detection of Fe < 3 + >, and the Fe < 3 + > detection effect can be visualized by using an induction strip of a nitrogen-doped carbon nanodot matrix.

The invention discloses a method for preparing an ultrathin nanoribbon structure perovskite single crystal. The preparation method comprises the following steps: 1) combining AX and PbX 2 Dissolve in the precursor solvent according to the molar ratio of n:1, heat and stir to obtain the three-dimensional perovskite APbX 3 The precursor solution; 2) the three-dimensional perovskite APbX 3 Take an appropriate amount of the precursor solution and drop it on the substrate, place the substrate in a vessel containing anti-solvent, seal the mouth of the vessel; place it in an oven, let it stand for crystal growth, and obtain an ultra-thin tape Shaped perovskite single crystal; wherein: AX is selected from one or more of methylamine bromide, formamidine bromide and cesium bromide; X is a halogen anion, and n is 1-2.2. The optimal luminous wavelength of the ultra-thin perovskite single crystal obtained by the invention is 508-512nm, which realizes low-threshold laser lasing at room temperature and continuous optical pumping laser lasing at liquid nitrogen temperature.

The invention relates to an anthracene backbone type self-porous polymer and its synthesis method and application, and belongs to the field of polymers. The molecular weight of the polymer is 4000-400000, the molecular weight distribution is 1.15-3.50, and the specific surface area is 50-800m 2 / g. The preparation method is: Diels-Alder reaction between 2,6-diaminanthracene and maleimide, or Diels-Alder reaction between 2,6-diaminanthracene and maleimide derivatives. , to obtain the bisaniline monomer; use the Chaogel base reaction to cause the bisaniline monomer to undergo a polycondensation reaction to obtain a polymer; then use the reverse reaction of the Diels-Alder reaction to remove the maleimide or maleimide Derivatives are obtained to obtain anthracene backbone-type self-porous polymers. The invention uses maleimide or maleimide derivatives as the protective group of the anthracene functional group. The synthesized polymer has microporous structure, solubility and photosensitive properties, and can be used as a photosensitizer for degrading organic matter. Pollutants and photodynamic preparations and other fields.

The invention discloses a solid broadband blue-light transmitting organic luminescent material shown in a formula I and a preparation method thereof. R is H or OCH3. Two functional structural units such as the quinoxaline group and the pyridazinone group are effectively combined to form a pyridazinone-type organic luminescent molecule with quinoxaline being functionalized. The two-heterocyclic-ring pyridazinone compound provided by the invention is stable in structure and easy to store, a good ultraviolet absorption property and a strong fluorescent transmitting property in a chloroform solution can be realized, and the solid broadband blue-light transmitting organic luminescent compound is expected to become a novel organic material obtaining the white light. The preparation method is simple, the luminescent material is good in stability and can be used in the fields such as luminescent devices, white light luminescence or fluorescent probes. By adopting the solid broadband blue-light transmitting organic luminescent material and the preparation method thereof, the research and application field of the quinoxaline pyridazinone compound can be enlarged.

The invention provides a stable method for preparing a nitrogen-doped graphene quantum dot material. The preparation method comprises the following steps: dispersing networked reduced graphene oxide in concentrated nitric acid, and heating in an oil bath to a temperature of 140-160 DEG C while magnetic stirring, and reacting at a constant temperature for 12-48 hours under circulating water condensation; removing circulating condensate water, continuously evaporating at the constant temperature for 2-3 hours, and cooling to a room temperature; adding ultrapure water for ultrasonic dispersion, filtering, performing rotary evaporation and concentration on the filtrate, and filling in a dialysis bag of 3000-8000Da to dialyze for 24-48 hours; and performing rotary evaporation and concentrationon the dialysate again, and performing vacuum freeze drying, thereby obtaining the nitrogen-doped graphene quantum dots. The luminous stability of the nitrogen-doped graphene quantum dot is improved to a certain degree, and complicated passivating treatment and mixed element doping processes in the traditional process of preparing the doped quantum dots are effectively simplified. Moreover, the charge transfer capacity of the quantum dots is effectively improved, and the application potential in more fields such as photoelectricity, biomedicine and the like is facilitated.

The invention discloses a ratio-dependent fluorescent probe for detecting hydrogen peroxide. The ratio-dependent fluorescent probe is an anthocyanin-like derivative, has the chemical structure as shown in the formula (1) and is particularly 2-(3-(7-diethylamino) coumarin)-4-(2-phenmethyl)-7-diethylamino-benzopyran perchlorate. The probe disclosed by the invention is cheap and available, convenient to use, capable of specifically reacting together with hydrogen peroxide to generate a coumarin derivative with stronger fluorescence emission capacity, free of interference from other related oxides in the process of detecting hydrogen peroxide, favorable in hydrogen peroxide selectivity and capable of accurately detecting hydrogen peroxide in living cells.

The invention relates to an anthracene main chain type polymer of intrinsic microporosity as well as a synthetic method and application thereof, and belongs to the field of polymers. The molecular weight of the polymer is 4000-400000, the molecular weight distribution is 1.15-3.50, and the specific surface area is 50-800 m<2> / g. The preparation method comprises the following steps: performing a Diels-Alder reaction on anthracene-2,6-diamine and maleimide, or performing a Diels-Alder reaction on anthracene-2,6-diamine and a maleimide derivative to obtain a dianiline monomer; performing a polycondensation reaction on the dianiline monomer by using a Troger base reaction to obtain a polymer; and performing a reverse reaction of the Diels-Alder reaction to remove the maleimide or the maleimidederivative to obtain the anthracene main chain type polymer of intrinsic microporosity. According to the method, the maleimide or the maleimide derivative is used as a protective group of an anthracene functional group, the synthesized polymer has a microporous structure, solubility and light sensitive characteristic, and can be used as a photosensitizer in the fields of organic contaminant degradation and photodynamic preparations.

The invention discloses a fluorescent probe for detecting viscosity and hydrogen peroxide, a synthesis method and an application thereof, and belongs to the technical field of chemical analysis and detection. The probe of the present invention is obtained by the coupling reaction of aldylated benzothiazole and 4-picoline salt substituted by methylene phenylboronic acid, and has the following structure: due to the quenching effect of distorted intramolecular charge transfer (TICT), The probe molecule has almost no fluorescence emission characteristics; however, as the viscosity of the environment system increases, the TICT effect is suppressed, and the probe molecule presents a strong fluorescence emission with an emission peak at 680 nm. In addition, the probe can also detect H 2 o 2 Produces a sensitive fluorescence response, and the position of the emission peak is at 590 nm after the reaction. The concentration range for detection of hydrogen peroxide is 0–25 μmol L ‑1 , with a detection limit of 0.34 μmol L ‑1 . The probe can be used in water and intracellular H 2 o 2 detection.

The invention relates to an s-triazine derivative, and a preparation method and application thereof. The structural formula of the derivative is as shown in the specification. The preparation method comprises the following steps: weighing p-fluorobenzaldehyde, 2-(ethylamino)ethanol, cetyl trimethyl ammonium bromide (CTAB) and K2CO3, dissolving in dimethylsulfoxide (DMSO), stirring for 15-30 hours at 80-120 DEG C, and separating to obtain a compound I; and adding 2,4,6-trimethyl s-triazine and KOH into a solvent, stirring for 30 minutes at 60-110 DEG C, dripping an ethanol solution of the compound I, continuously reacting for 15-30 hours at 60-110 DEG C, and separating to obtain the s-triazine derivative. The s-triazine derivative can be grafted on the surface of a glass sheet in a flat-lying manner to form a monomolecular film fluorescence sensor for DNT (dinitrotoluene) detection. Due to the flat-lying grafting manner, the probability of pi-pi stacking formed between fluorescent molecules can be greatly reduced, and the optical property and response sensitivity of fluorescent molecules can be improved.

The invention discloses a multi-response azacyclo-formaldehyde fluorescent probe molecule with a structure shown as a formula I and a preparation method and application thereof, the molecule realizesselective quantitative recognition of formaldehyde through a fluorescence analysis method, and formaldehyde, copper ions and sulfur ions are tested and evaluated in the fields of automotive trim materials, healthy home furnishing, biological medicines and the like. The multi-response azacyclo-formaldehyde fluorescent probe molecule can be used for fluorescence imaging of biological samples, can also be used as an ultraviolet light absorber to be applied to the technical fields of plastics, coatings, printing ink, display, illumination, glasses, daily-use chemical industry, textiles and the like, and in addition, the multi-response azacyclo-formaldehyde fluorescent probe molecule provided by the invention has relatively strong fluorescence emission performance under both solution and solidconditions; can be used as a fluorescent material in the fields of anti-counterfeiting technologies, light conversion materials, fluorescence labeling, fluorescence imaging and the like, wherein R isH or Cl, and X is CH or N.

The invention discloses a multi-response azacyclic formaldehyde fluorescent probe molecule with the structure shown in formula I and its preparation method and application. The molecule realizes the selective and quantitative recognition of formaldehyde through the fluorescence analysis method, and is used in automotive interior materials, health Carry out testing and evaluation of formaldehyde, copper ions and sulfide ions in the fields of home furnishing, biomedicine, etc. It can also be used for fluorescence imaging of biological samples, and can also be used as an ultraviolet absorber for plastics, coatings, inks, displays, lighting, glasses, daily use Chemical industry, textiles and other technical fields, in addition, the multi-responsive azacyclic formaldehyde fluorescent probe molecule provided by the present invention has strong fluorescence emission performance in solution and solid state, and can be used as a fluorescent material for anti-counterfeiting technology, light conversion Materials, fluorescent labels, fluorescent imaging, etc.: wherein, R is H or Cl, and X is CH or N.

The invention relates to an s-triazine derivative, and a preparation method and application thereof. The structural formula of the derivative is as shown in the specification. The preparation method comprises the following steps: weighing p-fluorobenzaldehyde, 2-(ethylamino)ethanol, cetyl trimethyl ammonium bromide (CTAB) and K2CO3, dissolving in dimethylsulfoxide (DMSO), stirring for 15-30 hours at 80-120 DEG C, and separating to obtain a compound I; and adding 2,4,6-trimethyl s-triazine and KOH into a solvent, stirring for 30 minutes at 60-110 DEG C, dripping an ethanol solution of the compound I, continuously reacting for 15-30 hours at 60-110 DEG C, and separating to obtain the s-triazine derivative. The s-triazine derivative can be grafted on the surface of a glass sheet in a flat-lying manner to form a monomolecular film fluorescence sensor for DNT (dinitrotoluene) detection. Due to the flat-lying grafting manner, the probability of pi-pi stacking formed between fluorescent molecules can be greatly reduced, and the optical property and response sensitivity of fluorescent molecules can be improved.