Synthesis of crescent aromatic oligoamides with preorganized chelating groups and their extraction towards transition metal ions

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• 作者：Xinshi Yang ; Long Chen ; Yongan Yang ; Youzhou He ; Shuliang Zou ; Wen Feng ; ^{wfeng9510@scu.edu.cn} ; Yuanyou Yang ; Ning Liu ; Jiali Liao ; Lihua Yuan ; ^{lhyuan@scu.edu.cn}
• 关键词：Aromatic oligoamide ; Solvent extraction ; Hydrogen bonding ; Transition metal ion
• 刊名：Journal of Hazardous Materials
• 出版年：2012
• 期刊代码：50_03043894
• 类别：ce
• 出版时间：30 May, 2012
• 卷：217-218
• 期：Complete
• 页码：171-176
• 文件大小：418 K

摘要

Three crescent aromatic oligoamides 1-3 with their backbones rigidified by intramolecular hydrogen bonds were designed and synthesized. The liquid-liquid extraction by these compounds has been investigated using UV-vis spectrometry towards Pb²⁺ picrate and some transition metal picrates including Ag⁺, Hg²⁺, Cd²⁺, Zn²⁺, Cu²⁺, Co²⁺, Ni²⁺ salts. The results revealed higher selectivity and efficiency towards Hg²⁺ over other metal cations; pentameric ligand 1 with six oxygen donor atoms provided the highest extractability of 83.3%, while dimeric ligand 3 extracted almost exclusively Hg²⁺. The stoichiometry of the extracted complex between ligand 1 and Hg²⁺, and the extraction constant (log K_ex) were determined in solvent extraction.