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Binuclear zinc complex serving as mercury ion fluorescent probe and preparation method of same

A technology of zinc complexes and fluorescent probes, applied in the field of dinuclear zinc complexes of quaternary aromatic acids and its preparation, can solve the problems of complicated sample pretreatment, weak fluorescence, expensive instruments, etc., and achieve good selective recognition effect

Inactive Publication Date: 2015-06-03
HENAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] At present, the commonly used mercury compound detection methods include spectrophotometry, atomic emission spectrometry, atomic absorption spectrometry, hydride generation-atomic fluorescence spectrometry, etc. These methods often have the disadvantages of expensive instruments, long analysis period, complicated sample pretreatment, and detection costs. Expensive and other issues, it is difficult to meet the requirements of convenience, speed, sensitivity and other aspects of mercury ion detection [Mo Jiefang et al., Modern Instruments, 3(2010) 14]
The present invention relates to a tetravalent aromatic acid dinuclear zinc complex used as a fluorescent probe for mercury ions. Due to the fluorescence quenching produced by effective photo-induced electron transfer, the complex shows weak fluorescence. When a certain amount of Hg is added 2+ The fluorescence of ions and complexes is greatly increased, with high sensitivity and selectivity, and has the characteristics of simple and fast operation, non-toxicity, environmental friendliness and high selectivity. This kind of zinc complex fluorescent probe has not been reported in the literature.

Method used

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  • Binuclear zinc complex serving as mercury ion fluorescent probe and preparation method of same
  • Binuclear zinc complex serving as mercury ion fluorescent probe and preparation method of same
  • Binuclear zinc complex serving as mercury ion fluorescent probe and preparation method of same

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Embodiment 1

[0025] The synthesis of embodiment 1 complex:

[0026] 0.0717g (0.2mmol) H 4 bptc, ​​0.0384g (0.2mmol) 4,4'-bpy and 0.0878g (0.4mmol) Zn(CH 3 COO) 2 2H 2 O was dissolved in 10 mL of distilled water, and the pH value of the mixed solution was adjusted to 5.5 at room temperature, stirred for 20 minutes, transferred to the polytetrafluoroethylene liner of a 25 mL hydrothermal reaction kettle, and reacted at 160 ° C for 96 hours, and the After cooling to room temperature, the resulting product was washed twice with anhydrous diethyl ether (1 mL / time) to obtain light yellow blocky crystals, with a yield of 82.3% based on metal Zn.

Embodiment 2

[0027] The structural characterization of embodiment 2 complex:

[0028] The crystal structure adopts Bruker Smart CCD X-ray single crystal diffractometer at 296(2)K, and the selected size is 0.42×0.36×0.28mm 3 The crystals, using graphite monochromatized MoKα rays (λ=0.07107nm) as the incident radiation source, collected diffraction points by ω / 2θ scanning, the unit cell parameters were refined by the least square method, and the collected data were analyzed by SADABS program Data were corrected for absorption. The structure of the complex was solved by the direct method, the coordinates of non-hydrogen atoms and the anisotropy temperature factor were refined by the full-matrix least-squares method, and all calculations were completed by the SHELXTL program. The detailed crystallographic parameters are listed in Table 1. Binuclear zinc complex [Zn 2 (bptc) 4 ·(bpy) 2 ·H 2 The crystal structure diagram, two-dimensional planar structure and three-dimensional hole structur...

Embodiment 3

[0032] The fluorescent property of embodiment 3 complexes:

[0033] Using the F-7000FL fluorescence spectrometer, the fluorescence properties of the complex were measured at room temperature, and the fluorescence spectrum of the complex in distilled aqueous solution is shown in Figure 4 As shown, the excitation light wavelength is 287nm, and the emission peak is located at 333nm. When Hg 2+ (Hg 2 (NO 3 ) 2 ) when the addition concentration is an integer multiple of the complex concentration (1-3 times), and the complex blank sample (without adding Hg 2+ ions), the position of the emission peak of the complex does not shift (333nm, λ ex =287nm), but the intensity of its emission peak increases with Hg 2+ The concentration of ions is significantly enhanced. When adding Hg 2+ When the ion concentration is respectively 1-3 times of the complex blank sample concentration, the peak intensity is respectively enhanced to 21 times, 36 times and 45 times of the corresponding bl...

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Abstract

The invention relates to a quaternary aromatic acid binuclear zinc complex serving as mercury ion fluorescent probe and a preparation method of the complex. the chemical formula of the complex is [Zn2(bptc)4.(bpy)2.H2O], wherein bptc is 3,3',4,4'-four carboxyl benzophenone, and bpy is 4,4'-bipyridyl; the complex adopts a three-dimensional nanometer-sized micropore structure. When the complex serves as the mercury ion fluorescent probe, mercury ion can not influence the position of a fluorescent emission peak of the quaternary aromatic acid binuclear zinc complex, and the intensity of the emission peak of the complex is enhanced remarkably as the concentration of Hg2+ ion increases (the maximum enhanced extent can reach about 45 times). The complex can serve as a fluorescent probe of Hg2+ ion and has a potential application prospect in the field of environmental monitoring and life science.

Description

technical field [0001] The present invention relates to a kind of mercury ion (Hg 2+ ) tetravalent aromatic acid dinuclear zinc complex of a fluorescent probe and a preparation method thereof, the fluorescent probe has potential application prospects in the fields of environmental monitoring and life sciences. technical background [0002] The transition metal carboxylic acid microporous complex is a periodic and highly regular microporous network structure constructed by self-assembly of metal ion centers or clusters and carboxyl-containing organic ligands. It has both traditional inorganic materials (pores) Polymerization and high thermal stability) and the characteristics of contemporary new materials (high specific surface area, adjustable pore size, diverse skeleton structure, easy functionalization, and environmental friendliness), the microporous structure is a remarkable feature of this type of complex, It is also one of the main sites showing excellent functionalit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F3/06C09K11/06G01N21/64
Inventor 杨立荣张怀敏张武邵彩云吴兰枝刘流
Owner HENAN UNIVERSITY
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