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A ditopic receptor for cation binding and facilitated transport through a supported liquid membrane

Lookup NU author(s): Professor Andrew Benniston, Emeritus Professor Anthony Harriman


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The binding properties of an artificial receptor towards a series of cations including Li+, Na+, K+, Mg 2+, Ca2+, Ba2+, Fe2+ and Al 3+ in acetonitrile are described. The receptor comprises a photo-responsive pyrene unit connected via a short spacer to a 2,2′:6′,2″-terpyridine metal ion binding site. Interaction of cations with the receptor was monitored by changes in absorption profile and the association constants calculated for 1:1 and 1:2 cation:ligand binding fall within the range log β = 3-12. The receptor is highly fluorescent and quenching of the emission is observed upon cation binding. The potassium picrate transport properties of the membrane-bound receptor are also described. This receptor when immobilised in a polymer support, which separates two aqueous solutions, has been shown to transport potassium ions in the dark with a flux rate of 1.5 × 108 mol/s m2. In contrast, when the membrane-bound receptor is selectively illuminated with light (λ > 400 nm), the flux increases to 2.0 × 108 mol/s m2. The transport efficiency depends on the nature of the trap used in the receiver phase. © 2005 Elsevier B.V. All rights reserved.

Publication metadata

Author(s): Benniston AC, Harriman A, Lawrie DJ, Mehrabi M, Russell OD

Publication type: Article

Publication status: Published

Journal: Inorganica Chimica Acta

Year: 2005

Volume: 358

Issue: 12

Pages: 3483-3490

Print publication date: 01/08/2005

ISSN (print): 0020-1693

ISSN (electronic): 1873-3255

Publisher: Elsevier


DOI: 10.1016/j.ica.2005.04.020


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