高等学校化学学报 ›› 1987, Vol. 8 ›› Issue (3): 209.

• 论文 • 上一篇    下一篇

一组不对称变色酸双偶氮肿类试剂的合成及其与稀土等元素显色反应研究

戴萍祁, 余席茂, 罗庆尧, 曾云鹗   

  1. 武汉大学化学系
  • 收稿日期:1985-11-25 出版日期:1987-03-24 发布日期:1987-03-24
  • 基金资助:

    国家教育委员会重点科研资助项目

Synthesis of Two Series Arsenazo Types with Different Auxochromic Groups and Positions and Studies on Their Colour Reactions for Rare Earth, Thorium,Zirconium and Uranium

Dai Pingqi, Yu Ximao, Luo Qingyao, Zeng Yun'e   

  1. Department of Chemistry, Wuhan University, Wuhan
  • Received:1985-11-25 Online:1987-03-24 Published:1987-03-24

摘要: 本文设计、合成了一组新的不对称变色酸双偶氮胂类稀土显色剂。对新试剂进行了提纯鉴定,确定了组成及结构,研究了它们与稀土、钍、锆的显色反应性能。实验证明,试剂分子结构对其反应性能的影响有一定的规律性。其中o-As-DBN试剂是较优良的钍显色剂,毫克级的稀土、铀不干扰测定。

Abstract: In this paper, two series of arsenazo types reagents with diffrent auxochromic groups and positions for rare earth, thorium etc. have been designed and synthesized. The reagents were purified by TLCand their strutures were determined by infrared spectra, quantitative elemenitary analysis and thermogravimetrici analysis. They are easily soluble in water, alcohol and acetone but insoluble in benzene and ether. The colour reaction of the reagents with rare earth, thorium and zirconium elemnts have also been studied. The result shows that the effects of their molecular structure on the colour reaction have some regularity. The absorption maxima of the complexes of reagents o-As-TX (X=C1, Br,I) with La, Gd, Yb gradually increase with the dercrease in electronegativity of subtituent Gl, Br, I, but with Y, the phenomenon is contrary. The sensitivity of o-As-DXN reacting with rare earth elements are lower and rapidly decreases with the increase in acidity of medium, but with Th, Zr, it is still higher. In these colour reagents, o-As-DBNis excellent colour reagent in the determination of thorium The tolerant quantity of rare earth elements can reach several milligrams, especially for uranium.

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