三乙烯四胺基双(二硫代甲酸钠)及其重金属配合物的光谱研究

doi:10.3964/j.issn.1000-0593(2009)03-0829-04

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摘要：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CN键和CS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)。

关键词：三乙烯四胺(TETA);二硫化碳;配合物;流动注射;火焰原子吸收光谱(FAAS)

Abstract：A sodion triethylenetetramine-bisdithiocarbamate(DTC-TETA) and its complexes with heavy metal ions were investigated by FTIR, UV, FAAS and elemental analysis, respectively. The FTIR spectrum of DTC-TETA showed strong absorption peaks at 1 461-1 388 cm^-1 and 1 174-996 cm-1 which were attributed to partly double bonds of CN and CS, respectively. The UV spectrum of DTC-TETA had two absorption peaks at 265 and 290 nm, assigned to π—π^* transition of N…C…S radical and nonbonding electron n—π^* transition of S…C…S radical to conjugated system, respectively. The elemental analysis results demonstrated that the mol ratio of C, H, N and S in DTC-TETA was about 2∶4∶1∶1. As for UV spectrum of its complexes with Cu(Ⅱ), Cd(Ⅱ), Zn(Ⅱ) and Ni(Ⅱ), there were four new absorption peaks at 321, 310, 311 and 325 nm, respectively. Coupled to flow-injection, FAAS determination showed that the complexation performance of Cu²⁺,Cd²⁺,Ni²⁺ and Zn²⁺ complexes of DTC-TETA was better than that of sodium diethyldithiocarbamate (DDTC).

Key words：Triethylenetetramine(TETA);Carbon bisulfide;Complex;Flow injection;Flame atomic absorption spectrum(FAAS)

收稿日期: 2007-10-08 修订日期: 2008-01-08

中图分类号:

O657.3

通讯作者: 廖强强 E-mail: liaoqq1971@yahoo.com.cn

引用本文:

廖强强^1,2,王中瑗¹,李义久¹,相波¹,程如梅¹,张勤建³. 三乙烯四胺基双(二硫代甲酸钠)及其重金属配合物的光谱研究[J]. 光谱学与光谱分析, 2009, 29(03): 829-832.
LIAO Qiang-qiang^1,2,WANG Zhong-yuan¹,LI Yi-jiu¹,XIANG Bo¹,CHENG Ru-mei¹,ZHANG Qin-jian³. Spectra Study of a Sodion Triethylenetetramine-bisDithiocarbamate and Its Complexes with Heavy Metal Ions. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2009, 29(03): 829-832.

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