The invention relates to a preparation method for a high-selectivity Sn4+ fluorescent probe based on a dirhodamine-ethanolamine derivative. Rhodamine B and ethanolamine are subjected to condensed acylation reaction to obtain a rhodamine-ethanolamine derivative, and the rhodamine-ethanolamine derivative and isophthaloyl dichloride are subjected to reaction to obtain the dirhodamine-contained Sn4+ fluorescent probe-SnP1. The probe shows good selectivity in a system where Sn4+ and other metal ions coexist, has the advantages of high sensitivity, fast response, reversible operation and the like, and can be well applied to detection of Sn4+ in an environment.

Dirhodamine-based Sn4+ fluorescent probe molecule and preparation method and application thereof

The invention discloses a preparation method for a fluorescence enhanced probe for rapidly detecting Cr ions in a water solution and application of the ionic fluorescence enhanced probe. The preparation method comprises the following steps: dissolving compounds 1L-histidine and potassium carbonate into methanol, in the presence of nitrogen, performing stirring backflow reaction, cooling to the room temperature, performing reduced pressure distillation to remove a solvent, and performing silica-gel column chromatography separation, thereby obtaining a fluorescence probe L. The fluorescence enhanced probe L is a rhodamine B type fluorescence probe, and a solvent which is capable of selectively recognizing Cr ions is adopted as the water solution. The preparation method has the advantages that excellent selectivity and specificity of Cr recognition are achieved, after the fluorescence probe L is acted with the Cr , fluorescence enhancement is achieved, fluorescence enhanced recognition upon the Cr is achieved, high detection sensitivity is achieved, fluorescence signals generated when the fluorescence enhanced probe is acted with other common metal ions are barely changed, and thus the fluorescence enhanced probe is high in interference resistance and can be applied to recognition on the Cr .

Preparation method for fluorescence enhanced probe for rapidly detecting Cr ions in water solution and application of ionic fluorescence enhanced probe

The invention discloses an Hg fluorescence probe based on rhodamine with a double-carbon-sulfur-bond structure as well as a preparation method and an application of the Hg fluorescence probe. Recognition characteristics of a probe HgP1 in a CH3OH-H2O solution for metal ions are researched by an ultraviolet-visible spectrophotometer and a fluorescence spectrophotometer. A result indicates that the probe HgP1 has efficient and exclusive selectivity for Hg , has higher metal cation and anion interference resistance, and can realize naked-eye recognition for mercury ions through color change of the solution. The lowest detection limit of the probe on the mercury ions is 0.256 mu g/kg, so that the method can meet the limitation requirement of the national standard on the mercury ions, and the probe has higher actual application value.

Hg fluorescence probe containing rhodamine with double-carbon-sulfur-bond structure as well as preparation method and application of Hg fluorescence probe

The invention provides a method for detecting stannous ions by using a rhodamine fluorescence probe. The method comprises the following steps: adding a rhodamine fluorescence probe solution to a NaOH/NaH2PO4 buffer solution to obtain multiple fluorescence probe-containing buffer systems, respectively adding different volumes of a stannous ion solution to obtain stannous ion solutions with different concentrations, standing the stannous ion solutions, detecting the fluorescence intensity at an emission wavelength of 587nm under an excitation wavelength of 560nm, and mapping through adopting the concentration of the stannous ions as abscissa and the fluorescence intensity as ordinate to obtain a linear relation curve; and adding the rhodamine fluorescence probe solution to the NaOH/NaH2PO4 buffer solution to obtain a fluorescence probe-containing buffer system, adding a stannous ion solution to be detected, standing the obtained system, detecting the fluorescence intensity at an emission wavelength of 587nm under an excitation wavelength of 560nm, and calculating the concentration of the stannous ions. The method has the advantages of simple operation, fast detection, high sensitivity and good selectivity.

Method for detecting stannous ions by using rhodamine fluorescence probe

The invention discloses a rhodamine B-based fluorescence sensor and preparation. The preparation comprises the following steps: dissolving 3-(3',6'-bi(diethyl amino)-3-oxaspiro[isoindoline-1,-1,9'-xanthene]-2-yl) propanal (A) in methyl alcohol, adding 6-aminocaproic acid (B), and stirring at room temperature; dissolving sodium triacetoxyborohydride in tetrahydrofuran, adding to a reaction liquid in the step 1, and further carrying out stirring reaction at room temperature; dropwise adding a saturated sodium bicarbonate solution to the reaction liquid, and further stirring; and removing a solvent by virtue of a rotary evaporator, and separating by using a thin layer chromatography, so as to obtain a target product. The rhodamine B-based fluorescence sensor is relatively simple in synthesis step; resources are saved; and nearly all the reported fluorescence probes can only be applied to an organic solvent or an organic water solution, thus the application of the fluorescence sensor in the fields of actual water sample analysis and life is limited.

Bao Xiaofeng

Papers

Rhodamine B-based fluorescence sensor and preparation