An Isomer Specific,Highly Selective Fluorescent Chemosensor for K~+ from a Bis-naphtho-15-Crown-5 Derivative

摘要

Three isomeric series of bis(crown ether)s have been synthesized by condensation of the appropriate formylnaphthocrown with 1,4-phenylenediacetonitrile.The interaction of these ligands with K~+ and Na~+ has been investigated by UV and fluorescence spectroscopic techniques.Among them the bis(crown ether)2a exhibits excellent K~+-selectivity over Na~+ and a dramatic increase in the fluorescence intensity of chromo-phores.