A selective optode membrane for silver ion based on fluorescence quenching of the dansylamidopropyl pendant arm derivative of 1-aza-4,7,10-trithiacyclododecane ([12]aneNS3)

A highly sensitive and selective flourimetric optode membrane for the determination of trace amounts of Ag+ ions was prepared. The plasticized PVC-membrane incorporating potassium tetrakis(p-chlorophenyl)borate and 1-(dansylarnidopropyl)-1-aza-4,7, 10-trithiacyclododecane (L), as a highly fluorescent chromoionophore, displays a calibration response for Ag+ ions over a wide concentration range of 5.0 x 10(-7) to 1.7 x 10(-2) M. It has a response time of < 40 s. In addition to its high stability, reproducibility and relatively long working lifetime, the optical sensor revealed good selectivity for silver ion over several common diverse ions. (c) 2005 Elsevier B.V. All rights reserved.