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1 January 2006 A Highly Selective Bicyclic Fluoroionophore for the Detection of Lithium Ions
Nantanit Wanichecheva, John S. Benco, Christopher R. Lambert, W. Grant McGimpsey
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Abstract

The macrobicyclic molecule, 21-(9-anthrylmethyl)-4,17,13,16-tetraoxa-1,10,21-triazabicyclo [8.8.5]tricosane-19,23-dione, I, was designed, synthesized and characterized as a fluoroionophore for the selective, optical detection of lithium ions. Compound I is based on a bridged diazacrown structure, which provides a semirigid binding framework. Binding takes place by electrostatic interactions between the oxygen atoms of the crown and the cation and is transduced to fluorescence emission from an attached anthracene fluorophore. In a 75:25 dichloromethane/tetrahydrofuran solvent mixture, I acts as an intramolecular electron transfer “off–on” fluorescence switch, exhibiting a greater than 190-fold enhancement in fluorescence emission intensity in the presence of lithium ions. The relative selectivity of I for lithium ions over sodium, potassium and ammonium ions was found to be log KLi ,Na ∼ −3.36, log KLi ,K ∼ −1.77 and log KLi ,NH4 ∼ −2.78.

Nantanit Wanichecheva, John S. Benco, Christopher R. Lambert, and W. Grant McGimpsey "A Highly Selective Bicyclic Fluoroionophore for the Detection of Lithium Ions," Photochemistry and Photobiology 82(1), 268-273, (1 January 2006). https://doi.org/10.1562/2005-07-08-RA-606
Received: 8 July 2005; Accepted: 30 August 2005; Published: 1 January 2006
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