Analytica Chimica Acta
Ten Ag+-selective ionophores have been characterized in terms of their potentiometric selectivities and complex formation constants in solvent polymeric membranes. The compounds with π-coordination show much weaker interactions than those with thioether or thiocarbamate groups as the coordinating sites. Long-term studies with the best ionophores show that the lower detection limit of the best Ag+ sensors can be maintained in the subnanomolar range for at least 1 month. The best ionophores have also been characterized in fluorescent microspheres. The so far best lower detection limits of 3 × 10−11 M (potentiometrically) and 2 × 10−11 M Ag+ (optically) are found with bridged thiacalixarenes.
Szigeti, Zsófia; Malon, Adam; Vigassy, Tamás; Csokai, Viktor; Grün, Alajos; Wygladacz, Katarzyna; Ye, Nan; Xu, Chao; Chebny, Vincent J.; Bitter, István; Rathore, Rajendra; Bakker, Eric; and Pretsch, Ernö, "Novel Potentiometric and Optical Silver Ion-selective Sensors with Subnanomolar Detection Limits" (2006). Chemistry Faculty Research and Publications. 387.