Steric hindrance effects in tripodal ligands for extraction and back-extraction of Ag+
作者:Yuki Hiruta、Takafumi Watanabe、Etsuko Nakamura、Naoko Iwasawa、Hiroyasu Sato、Kensaku Hamada、Daniel Citterio、Koji Suzuki
DOI:10.1039/c3ra45700a
日期:——
A novel series of tripodal ligands with thiophenylether arms connected to an anchoring nitrogen has been investigated. Seven tripodal ligands were synthesized by combining methyl, isopropyl, and tert-butyl residue bearing thiophenylether sites as groups with different steric hindrance effects. The tripodal ligands allowed for the extraction of Ag+ ions from the aqueous phase into a chloroform phase by forming 1 : 1 complexes with Ag+. Back-extraction was performed with 1 M HNO3 aqueous solution. Each ligand showed different extraction and back-extraction efficiency for Ag+, affected by changes in steric hindrance caused by the various combinations of sidearms. These results are further supported by X-ray single crystal structural analysis.
研究了一系列新型三足配体,其苯硫醚臂与锚定氮相连。通过将带有苯硫基醚位点的甲基、异丙基和叔丁基残基组合作为具有不同空间位阻效应的基团,合成了七个三足配体。三足配体通过与 Ag+ 形成 1 : 1 络合物,可以将 Ag+ 离子从水相萃取到氯仿相中。用1M HNO3 水溶液进行反萃取。每个配体对 Ag+ 表现出不同的萃取和反萃取效率,这受到不同侧臂组合引起的空间位阻变化的影响。这些结果进一步得到X射线单晶结构分析的支持。