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Bioinorganic Chemistry and Applications
Volume 2006, Article ID 97141, 4 pages

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

School of studies in Chemistry, Vikram University, Ujjain 456010, India

Received 14 April 2006; Accepted 27 May 2006

Copyright © 2006 Anubhuti Awasthy et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A new class of redox-switched anthraquinone derived lariat ethers 1-(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 spectral analysis. These ionophores were used in liquid membrane carrier facilitated transport of main group metal cations across supported liquid membrane (SLM). Cellulose nitrate membrane was used as membrane support. Effect of various parameters such as variation in concentration of metal as well as ionophore, effect of chain length and end group of ionophore have been studied. The sequence of metal ions transported by ionophore M1 is Na+ > Li+ > K+ > Ca2+ > Mg2+ and the order of metal ions transported by ionophores (M2–M6) is Li+ > Na+ > K+ > Ca2+ > Mg2+. Ionophore M1 is selective for Na+, Li+, and K+ and ionophores (M2–M6) are selective for Li+ and Na+.