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A method for the detection of platinum ions based on Schiff base fluorescence-phosphorescence dual-channel
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A dual-channel, platinum ion technology, applied in the field of detection, can solve the problems of low sensitivity, short fluorescence lifetime, weak room temperature phosphorescence, etc., and achieve the effects of good selectivity, high sensitivity and low detection line
Inactive Publication Date: 2015-10-14
SICHUAN UNIV
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However, there are also some defects in detecting platinum ions by fluorescence alone. For example, the fluorescence lifetime is relatively short, and the background interference is relatively strong; the Stokes shift of fluorescence is also relatively short, and sometimes it is difficult to separate the wavelength of the excitation light from the wavelength of the emission light.
The above problems can be overcome by using phosphorescence detection method, but the room temperature phosphorescence of many materials is generally weak and the sensitivity is not high
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[0030] Add 10 mmol (1.22 g) of salicylaldehyde into a round-bottomed flask containing 50 ml of ethanol, then slowly add 5 mmol (0.54 g) of an ethanol solution of 1,2-o-phenylenediamine, the whole The system was reacted at 80° C. for 2 hours, cooled after the reaction, filtered, and washed with ethanol and ether in sequence to obtain orange-red crystalline solid L1.
Embodiment 2
[0031] Example 2: Synthesis of Schiff base L2.
[0032] 10 mmol (2.24 g) of 5-sodiumsalicylaldehydesulfonate (see [Choudary, B. M.; Ramani, T.; Maheswaran, H.; Prashant, L.; Ranganath, K. V. S.; Vijay Kumarb, K. Adv. Synth. Catal. 2006, 348, 493.]) was added to a round bottom flask containing 50 ml (the volume ratio of ethanol and water was 4:1) solvent, and then slowly added 5 mmol (0.54 g) The ethanol solution of 1,2-o-phenylenediamine was reacted at 80°C for 2 hours. After the reaction, it was cooled, filtered, and washed with ethanol and ether in turn to obtain yellow powder L2.
Embodiment 3
[0033] Example 3: Schiff base L1 to Pt 2+ UV-Vis analysis.
[0034] Dilute the solution of L1 in N,N-dimethylformamide (DMF) to 10 -5 mol dm -3 The concentration is divided into several parts, and equivalent amounts of various metal ions (Pt 2+ , Sr 2+ , S n 2+ , Pb 2+ , Cr 3+ , Mn 2+ , Al 3+ , Fe 3+ , Ce 3+ , Ag + , Li + , Mg 2+ , Na + , Cd 2+ , Cu 2+ , Ca 2+ , Zn 2+ , K + , Co 2+ , Ni 2+ , Pd 2+ ), standing for 3 hours, the naked eye can observe except adding Pt 2+ Except that one sample turns red, the color of other several sample solutions has no obvious change.
[0035] Dilute the solution of L1 in N,N-dimethylformamide (DMF) to 10 -5 mol dm -3 concentration, divided into several parts, and then added different concentrations of Pt 2+ (L1 and Pt 2+ The molar ratio of 0, 0.10, 0.20, 0.30, 0.40, 0.50, 0.60, 0.70, 0.80, 0.90, 1.0, 1.2, 1.5, 2.0) was left at room temperature for 3 hours. The color of the sample can be observed with t...
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Abstract
The invention discloses a fluorescence probe for detecting platinum ions based on fluorescence-phosphorescence dual channels of Schiff base. Compared with the current platinumion detection tool, the fluorescence probe for detecting platinum ions based on fluorescence-phosphorescence dual channels of Schiff base, disclosed by the invention, has higher specific selectivity, higher sensitivity and the like based on the advantages of fluorescence detection and phosphorescence detection, and achieves the purpose of being capable of detecting platinum ions in two solvents, namely water solution and organic solution. The invention claims to protect platinum ion detection using fluorescence-phosphorescence dual channels.
Description
technical field [0001] The invention belongs to the technical field of detection, relates to the field of fluorescence sensing of heavy metal ions, in particular to a detection method based on fluorescence-phosphorescence dual channels 2+ Methods. Background technique [0002] Platinum is one of the rarest elements in the earth's crust, but due to its excellent properties, it is widely used in various materials. Platinum and its alloys can be mixed with gold as dental materials; they can also be used as catalysts in the petrochemical industry; they can be used as corrosion-resistant instruments and parts of instruments, such as platinum utensils, platinum electrodes, resistance thermometers, etc.; Jewelry; Platinum compound - "cisplatin" has a strong anti-cancer ability, and has a good effect on inhibiting the development of cancer and alleviating cancer [J. Reedijk, Pure Appl. Chem. 1987, 59 , 181-192; L. Kelland, Nature Rev. 2007, 7 , 573-584.]. Although platinum ...
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