Chemical recognition phase of the fluorescence chemical sensor for copper (II) ions in aqueous solution

摘要

We review the principles of optical sensors based on the use of the sol-gel technique, in particular their fabrication. We also report on potential applications of the recognition phases prepared by encapsulation of fluorescent chemosensors which have been designed by means of a supramolecular approach: two anthryl groups (the signalling subunit) linked to diaminodiethero group (the receptor subunit). Occurrence of the metal ion receptor interaction is signalled through the enhancement of anthryl fluorescence. The enhancement takes place when the receptor is able to promote a photoinduced electron transfer mechanism. Cu(II) ions can be distinguished from other transition metal ions in aqueous solution by the recognition phase.