Fluorimetric Chemosensors Combined with Familiar CSPT Devices for the Selective Detection of Mercury(II) Ions

摘要

Fluorimetric and Computer Screen Photoassisted Technique (CSPT) studies on the binding properties of three\udcoumarin pendant arm derivatives of mixed aza-thioether macrocyclic ligands (L1-L3), incorporated into PVC\udplasticized polymeric membranes, towards a number of different metal cations were carried out. An enhanced\udselectivity of the ligands towards Hg2+ ion was detected. In particular, the DOS plasticized membrane containing L3\udand tetrakis(p-chlorophenyl)borate, TpClPB-, as lipophilic anionic additive, displayed a strong fluorescence\udactivation by Hg2+ over the wide concentration range of 10-7 to 10-3M. The influence of the ratio among ligand and\udlipophilic additive on the membrane performance was tested. In addition, the CSPT measurements showed that L3\udpossesses a unique selectivity towards Hg2+ ion with respect to several common diverse cations. Moreover CSPT\udtechnique permits to perform the fast and low cost monitoring of mercury (II) ions, by application of familiar devices\udand a chemometric approach