Design and Synthesis of Redox-Switched Lariat Ethers and Their Application for Transport of Alkali and Alkaline-Earth Metal Cations Across Supported Liquid Membrane

摘要

A new class of redox-switched anthraquinone derived lariat ethers1-(1-anthraquinonyloxy) 3, 6, 9 trioxaundecane 11-ol(M1), 1-(1-anthraquinonyloxy) 3, 6 dioxaoctane 9-ol(M2), 1-(1-anthraquinonyloxy) 3 oxapentane 5-ol(M3), 1-(1-anthraquinonyloxy) 3 oxapentane 5-butane(M4), 1-(1-anthraquinonyloxy) 3, 6 dioxaoctane 9-methane(M5) and 1-(1-anthraquinonyloxy) 3 oxapentane 5-methane(M6) have been synthesized and characterized by spectralanalysis. These ionophores were used in liquid membrane carrierfacilitated transport of main group metal cations across supportedliquid membrane (SLM). Cellulose nitrate membrane was used asmembrane support. Effect of various parameters such as variationin concentration of metal as well as ionophore, effect of chainlength and end group of ionophore have been studied. The sequenceof metal ions transported by ionophore M1isNa+> Li+> K+> Ca2+> Mg2+and the order of metal ions transported by ionophores(M2–M6) isLi+> Na+> K+> Ca2+> Mg2+.Ionophore M1is selective for Na+,Li+, and K+and ionophores(M2–M6) are selective for Li+andNa+.