5 results about "Quenching rate" patented technology

The invention discloses a preparation method and application of a thienyl metal organic framework material, a 1, 2, 4, 5-tetra (5-bromothiophene) benzene intermediate is synthesized through a Steyler reaction and an NBS bromination reaction, the intermediate reacts with 4-methoxycarbonyl phenylboronic acid to obtain long-size 1, 2, 4, 5-tetra (2-(5-(4-carboxyphenyl)) thienyl) benzene with a large conjugated system, and the long-size 1, 2, 4, 5-tetra (2-(5-(4-carboxyphenyl)) thienyl) benzene has a large conjugated system. And self-assembling with Zr < 4 + > by adopting a solvothermal method to obtain the MOF with a stable structure and an excellent fluorescent property. The prepared fluorescence-enhanced metal organic framework material has excellent chemical and hydrothermal stability, the quenching rate and recognition sensitivity of the fluorescence-enhanced metal organic framework material to Fe < 3 + > and aromatic nitro compounds are kept at 95% and above 104 orders of magnitude, and the prepared MOF has good application in selective fluorescence detection of Fe < 3 + > and aromatic nitro compounds.

The invention relates to the technical field of fluorescent probes, in particular to a fluorescent probe as well as a preparation method and application thereof, the fluorescent probe is silicon quantum dots (SiQDs), the fluorescent probe is blue under ultraviolet radiation and has an obvious absorption peak and a symmetrical fluorescence peak at 357nm and 461nm respectively, and the position of the fluorescence peak is irrelevant to excitation wavelength. The fluorescent probe provided by the invention is a blue fluorescent water-soluble silicon quantum dot with a large amount of amino groups and hydroxyl groups on the surface, and has excellent light stability and pH stability. H2O2 can effectively quench fluorescence of the fluorescent probe, a good linear relation exists between the fluorescence quenching rate and the logarithm of the H2O2 concentration, H2O2 can be quantitatively detected, the detection system has the advantage of being high in anti-interference capacity, and the established fluorescence detection method is successfully used for analyzing H2O2 in human serum and has good application prospects. The method is expected to be expanded to imaging analysis of active oxygen H2O2 in cells subsequently.

This invention belongs to the technical field of crystalline materials, and discloses a praseodymium-based complex crystalline material, its preparation method, and its fluorescence recognition application, with the chemical formula {[Pr(L 1.5 The compound is 2,2'-(2,3,5,6-tetramethyl-1,4-phenylene)bis(methylene)bis(sulfonyl)diethyl)benzoic acid. The preparation method involves dissolving Pr(NO3)3·6H2O, H2L, and the auxiliary uncoordinated ligand 1,4-bis(imidazol-1-yl)benzene in a DMF / ethanol / water mixed solvent, reacting at 90°C for 3 days, and then cooling to obtain plate-like crystals. This material is effective against Fe... 3+ It exhibits highly selective and sensitive fluorescence quenching response with a quenching rate of 99.8%; it can specifically recognize ethoxyquinoline (fluorescence enhancement) and 2,4-dichlorophenoxyacetic acid (fluorescence quenching); it can specifically recognize the antibiotic oxytetracycline with a fluorescence quenching rate exceeding 99%.

The present invention relates to a ternary aromatic acid terbium complex used as a multifunctional fluorescent probe for Fe 3+ , Cr 2 O 7 2‑ and Arg, and its chemical formula is [Tb 2 (NTB)(CH 3 COO)(OH) 2 (H 2 O)] n , where H 3 NTB is triphenylamine-4,4',4″-tricarboxylic acid. The terbium complex of the present invention, as a fluorescent probe, has obvious recognition effects on Fe 3+ , Cr 2 O 7 2‑ and Arg. After adding 300 μL of Fe ‑3 / Cr 3+ / Cr 2 O 7 2‑ with a concentration of 1×10 ‑3 M, the fluorescence intensity of the terbium complex is significantly quenched, and the fluorescence quenching rates are 94.91% and 97.76% respectively; after adding 300 μL of Arg (1×10 3+ M), the complex shows an obvious fluorescence enhancement phenomenon, and the fluorescence intensity is enhanced by about 4.5 times. Moreover, the recognition effects on Fe 2 O 7 2‑ and Arg are not interfered by other coexisting ions / molecules. When other interfering ions or molecules are added to the solutions containing Fe 3+ , Cr 2 O 7 2‑ and Arg respectively, the fluorescence quenching / enhancement phenomenon is still obvious, indicating that the terbium complex has strong selectivity and specificity for the detection of Fe 3+ , Cr 2 O 7 2‑ and Arg.

The application discloses a preparation method and application of a thienyl metal organic framework material, and synthesizes a 1,2,4,5-tetra(5-bromothiophene) benzene intermediate through a Stiller reaction and an NBS bromination reaction, and obtains a long-size 1,2,4,5-tetra(2-(5-(4-carboxyl phenyl))thiophene) benzene with a large conjugate system by reacting the intermediate with 4-methoxycarbonyl phenylboronic acid, and then obtains a MOF with stable structure and excellent fluorescence properties by self-assembly through a solvothermal method with Zr 4+ The fluorescence-enhanced metal organic framework material prepared by the application has excellent chemical and hydrothermal stability, the quenching rate and recognition sensitivity of the metal organic framework material to Fe 3+ and aromatic nitro compounds are kept at 95% and 10 4 orders of magnitude or more, and the prepared MOF has good application in selective fluorescence detection of Fe 3+ and aromatic nitro compounds.