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采用红外光谱、紫外光谱、原子吸收光谱及元素分析研究了三乙烯四胺基双(二硫代甲酸钠)(DTC-TETA)的结构及其重金属配合物的配位行为。在DTC-TETA的红外光谱图中,在1 461~1 388 cm-1处和1 174~996 cm-1处分别出现含有部分双键性质的C N键和C S键的特征吸收峰;在紫外光谱图中,分别在265和290 nm处出现两个最大吸收峰,分别对应于N…C…S基团的π—π*跃迁和S…C…S基团中硫原子上非键电子向共轭体系的n—π*跃迁;元素分析结果表明该化合物中碳、氢、氮、硫的摩尔比近似为2∶4∶1∶1。在Cu(Ⅱ),Cd(Ⅱ),Zn(Ⅱ),Ni(Ⅱ)配合物的紫外光谱图中分别在紫外区的321,310,311,325 nm处出现新的最大吸收峰。流动注射与火焰原子吸收联用分析结果表明DTC-TETA对铜、镉、镍、锌等重金属离子的络合能力强于二乙基二硫代氨基甲酸钠(DDTC)。
The structure and the coordination properties of heavy metal complexes of triethylenetetramine bis (sodium dithiocarbamate) (DTC-TETA) were studied by IR, UV, AAS and elemental analysis. In the IR spectrum of DTC-TETA, the characteristic absorption peaks of CN bond and CS bond containing some double bonds appear at 1 461-1 388 cm-1 and 1 174- 996 cm-1, respectively. In the UV spectrum In the figure, two maximum absorption peaks appear at 265 nm and 290 nm, respectively, corresponding to π-π * transitions of N ... C ... S groups and non-bonding electrons of sulfur atoms in S ... C ... S groups, respectively N-π * transitions of the yttrium system. The results of elemental analysis showed that the molar ratio of carbon, hydrogen, nitrogen and sulfur in this compound is approximately 2: 4: 1: 1. In the UV spectra of Cu (Ⅱ), Cd (Ⅱ), Zn (Ⅱ) and Ni (Ⅱ) complexes, new maximum absorption peak appeared at 321, 310, 311 and 325 nm in UV region respectively. The results of flow injection and flame atomic absorption spectrometry showed that the complexation ability of DTC-TETA to heavy metal ions such as copper, cadmium, nickel and zinc was stronger than that of DDTC.