The invention relates to the field of fluorescence probes, particularly to an Eu (III)-metal-organic framework and preparation and application methods thereof. The Eu (III)-metal organic framework isapplied to detection of quintozene. The Eu (III)-metal-organic framework has a chemical formula of {[(CH3)2NH2][Eu(cppc)2*2H2O]}n. The Eu (III)-metal-organic framework saves post-synthesis purification and can be directly applied to fluorescence detection of quintozene, thereby having the advantages of simple design, low cost and the like and being applicable to online sensitive and rapid analysis. The Eu (III)-metal-organic framework achieves a quintozene detecting limit of 1.67*10 M and meanwhile is short in response time, and meanwhile, can be thoroughly separated through simple filtering, thereby being high in reutilization rate. Besides, the Eu (III)-metal-organic framework achieves universality in the field of fluorescence sensing and facilitates practical application.

Eu (III)-metal-organic framework and preparation and application methods thereof

The invention belongs to the technical field of a porous frame material and relates to a metallic organic frame material for separating CO2 and a preparation method thereof. The method comprises the following steps: uniformly mixing 0.2mmol cupric salt, 0.1mmol organic ligand, 5mL dimethyl sulfoxide, 2mL ethyl alcohol and 0.02-0.08mL hydroiodic acid and then filling into a glass bottle with a cover; crystalizing for 1 day at 90 DEG C, thereby acquiring a massive green crystal with excellent crystallinity; and using alcohol for cleaning the acquired massive green crystal and drying under room temperature, thereby acquiring an inorganic-organic hybrid porous metallic organic frame crystal compound. The prepared porous metallic organic frame crystal compound is a novel functional material forseparating CO2 mixed gas; the separating effect is excellent; the compounding materials are simple and feasible; the method is simple; the operation is convenient; and the repeatability is high.

Metallic organic frame material for separating CO2 and preparation method thereof

The invention relates to a method for detecting magnesium ions through high-sensitivity high-selectivity fluorescence detection. The method comprises the following steps: 1) mixing terbium salt and salicylic acid polyether glycol ester according to a mol ratio being 0.5-2 to obtain a terbium complex solution in an organic solvent; 2) drying and calcining a magnesium-containing sample, using acid for dissolution, performing mild heating to steam excessive acid and water, using an organic solvent for dissolving or leaching, and metering a volume; and 3) uniformly mixing the magnesium-containingsample solution and the terbium complex solution in the step 1), and determining the fluorescence emission intensity of the solution under excitation of 365 nm at 545 nm; and calculating the magnesiumcontent according to the determined fluorescence intensity and work curve. The simple fluorescence spectrum method is used for quantitative and qualitative analysis on the magnesium ions, a special high-grade apparatus is not required, under definite optimum reaction condition, the reaction stability is good, the method reappearance is good, and the lowest detection limit is 1.74*10 umol/L.

Method for detecting magnesium ions through high-sensitivity high-selectivity fluorescence detection

The invention discloses a detection method for nitrite ions based on rare earth metal-organic frameworks. A general chemical formula of the rare earth metal-organic frameworks is [Tb(L)(H O)(DMF)].DMF. According to the method, a rare earth salt Tb(NO ) .4H O is considered as a rare earth source, and a terphenyl-3,4'',5-tricarboxylic acid is utilized as a ligand, and synthesis is performedby a hydrothermal method. The rare earth metal-organic frameworks have unique fluorescence emission performance, and can be used as a fluorescent probe to achieve analysis and detection on benzaldehyde. The detection method is wide in linear range, is low in detection limit, is simple in detection process, is easy to operate, and can achieve quick and sensitive detection on the nitrite ions, thusavoiding a complicated surface modification and functionalization process required for conventional probe materials.

Detection method for nitrite ions based on rare earth metal-organic frameworks

The invention discloses a terbium metal organic framework (Tb-MOFs) and preparation and application thereof. The nano shape of the terbium metal organic framework material is sheet. A preparation method of the Tb-MOFs includes the following steps: terbium nitrate is dissolved in deionized water to obtain a solution A, 1, 2, 4, 5-benzene tetracarboxylic acid is dissolved in the deionized water to obtain a solution B, sodium acetate trihydrate is dissolved in the deionized water to obtain a solution C, the solution A and the solution C are successively added into the solution B in the stirring state, the mixed solution is placed in a reaction kettle after being stirred for 5-15 minutes, and subjected to a thermostatic reaction for 48-72 hours at 60-70 DEG C; and after a reaction is completed, drying is conducted for 12-24 hours at 60 DEG C after centrifugal separation and washing to obtain a sheet Tb-MOFs material, and the sheet Tb-MOFs material is dispersed into water to obtain a Tb-MOFs solution. The terbium metal organic framework material is prepared through a reaction kettle preparation method, and can be used for specifically identifying Zn in samples. A detection method issimple, convenient and efficient, has high sensitivity, shows the good application effect, and therefore, has important application value for identification of the samples containing metal ions.

Terbium metal organic framework material and preparation and application thereof

The invention belongs to the field of fluorescence detection materials, and particularly relates to a preparation method of a rare earth terbium-based metal organic framework material and study on the performance of selectively recognizing heavy chromate ions in water. By selecting rare earth terbium emitting green light as metal central ions and selecting p-terphenyl-3,3'',5,5''-tetramethyl acid as organic sensitized ligands, a rare earth porous metal organic framework compound is synthesized under the hydrothermal condition. The compound causes the most obvious fluorescence quenching phenomenon to Cr2O72- anions in different anion solutions, and thus the compound can serve as a novel fluorescence probe for detecting Cr2O72- anions.

Terbium-based metal organic framework material, preparation method and application of terbium-based metal organic framework material

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Terbium-based metal organic framework material, preparation method and application of terbium-based metal organic framework material