2 results about "Quenching rate" patented technology

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 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.