苯并咪唑衍生物對痕量三價鉻離子和鉍離子的選擇性識別
[Abstract]:Metal ions are of great significance to both environment and organism, but when the concentration of metal ions is high, it will cause serious harm to environment and organism. It is necessary to establish a technique for the analysis and detection of metal ions at trace level. UV-Vis spectrophotometry has the advantages of wide application, high sensitivity and accuracy, good selectivity, wide range of suitable concentration, relatively low price of instrument, low cost of analysis, simple and rapid operation, etc. It is widely used in the detection of metal ions. Benzimidazole derivatives not only have good bioactivity and pharmacological activity, but also recognize molecules and ions. For example, nitrogen atoms on benzimidazole ring can complexate with metal cations to form stable benzimidazole metal complexes. Therefore, it is widely used in the recognition of metal ions. In this paper, five benzimidazole derivatives were designed and synthesized. It was found that they could selectively recognize Cr~ (3) or Bi~ (3) ions. The research contents include the following two aspects: (1) study on the recognition performance of benzimidazole ligands to Cr~ (3) two novel benzimidazole ligands 1-benzyl-3-pyridyl benzimidazolium chloride were synthesized. Compounds (L1) and 1-benzyl-3- (2-1H-benzo [d] imidazolomethyl) -1-methyl) benzimidazole chloride (L2). Through the optimization and screening of the experimental conditions, an analytical method for the determination of chromium (III) by ultraviolet spectrophotometry in C2H5OH/H2O (v:v=1:1) system was established. The results show that the maximum absorption of Cr~ (3) with ligand is at 207 nm. Under the optimum conditions, the absorbance of Cr~ (3) -L complexes with Cr~ (3) concentration is in the range of 0.05 ~ 2.60 渭 g mL-1. The detection limits were 0.026 and 0.034 渭 g mL-1, stoichiometric ratios were 1: 1, and the binding constants were 1.45 脳 10 ~ 4 and 8.36 脳 10 ~ 3 dm3 mol-1., respectively. The complexation reaction between the two ligands and trivalent chromium is exothermic and can occur spontaneously. The binding sites of Cr~ (3) on ligands were speculated by IR spectra and quantum chemistry calculations. The effect of ligand structure on the complexation ability of Cr~ (3) was studied. The method has been successfully applied to the determination of Cr~ (3) in practical samples. (2) the recognition properties of benzimidazolyl Hydrazone ligands to Bi~ (3) have been studied. Three benzimidazolyl hydrazone ligands, (E) N- (4-nitrophenyl methylene) -1H-benzimidazole-2-acyl, have been synthesized. Hydrazone (L3), (E)-N- (2H4-dichlorophenyl)-1H-benzimidazole-2-acylhydrazone (L4) and (E)-N- (3-methyl-4-hydroxyphenylene methyl) -1H-benzimidazole-2-acylhydrazone (L5). By optimizing the experimental conditions, an analytical method for the determination of bismuth (III) in CH3OH system was established by ultraviolet spectrophotometry. The results show that the complexation of ligand L3, L4 and L5 with Bi~ (3) is accompanied by red shift of absorption peak and enhancement of absorbance. Under the optimum experimental conditions, the absorbance of Bi~ (3) -L complex and the concentration of Bi~ (3) in the range of 0.21 ~ 6.48 渭 g 路m ~ (-1) ~ (-1) from Lamberbilt's law, the detection limits are 95.51 ~ 92.16 and 55.80 ng mL-1., respectively. By Job's plot method, the stoichiometric ratio of L3, L4 and L5 to Bi~ (3) is 1: 1. The binding constants obtained by Benesi-Hildebrand equation are 1.42 脳 104 and 1.47 脳 104dm3 mol-1., respectively. The complexation reaction between three ligands and trivalent bismuth is exothermic and spontaneous. The binding sites of Bi~ (3) to ligands were deduced by IR spectra and quantum chemistry calculations. The effects of ligand structure on the complexation properties of Bi~ (3) were studied. The method has been applied to the determination of bismuth in water and gastric medicine with satisfactory results.
【學(xué)位授予單位】:鄭州大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:O626.23;O657.3
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