An insight into the extraction of transition metal ions by picolinamides associated with intramolecular hydrogen bonding and rotational isomerization
作者:Yan Li、Yiming Jia、Zhenwen Wang、Xianghui Li、Wen Feng、Pengchi Deng、Lihua Yuan
DOI:10.1039/c4ra02030h
日期:——
picolinamides and extraction behaviour has been rationalized by highlighting the relationship between intramolecular hydrogen bonding and rotational isomerism. To this aim aromatic pyridine-2,6-dicarboxamides 1a–1c with N-substitution and their analogues 3a and 3b containing intramolecular hydrogen bonds were designed and synthesized. The results from the liquid–liquid extraction towards some representative
通过突出分子内氢键与旋转异构之间的关系,已使N-取代的吡啶甲酰胺的分子结构与萃取行为之间的明确联系合理化。为此,设计并合成了具有N-取代基的芳香族吡啶2,6-二甲苯酰胺1a-1c及其类似物3a和3b。从液-液萃取到一些代表性的过渡金属苦味酸盐的结果,包括Ag +,Hg 2 +,Pb 2 +,Cd 2 +,Zn 2 +,Cu 2 +,Co2+和Ni 2+的盐证明了较高的选择性和效率对汞2+比其他金属阳离子(88.6-95.4%)主要源于Ñ 3'-取代经由分子内氢键的破坏。X射线结构分析以及常温和可变温度的质子和碳NMR实验提供了支持性信息,用于阐明这些配体之间萃取能力的差异,特别是N-取代的重要性,后者导致形成影响萃取过程的旋转异构体。