Anion Selectivities of Dibutyltin Dihalides as Neutral Carriers for Ion-Selective Electrodes

Abstract

Di-n-butyltin dihalides (Bu₂SnY₂, Y=Cl, I, OMe) behaved as neutral carriers for anion-selective electrodes. A variety of selectivity patterns have been obtained by using Bu₂SnY₂ which differ in the electronegative substituents Y on the Sn atom. However, all electrodes containing Bu₂SnY₂ provided the highest degree of selectivity for the SCN^- ion. The interaction of Bu₂SnY₂ with the SCN^- ion was studied in the organic solution by means of ¹³C NMR spectroscopy. In the case of the addition of NaSCN, a significant increase of the value of ¹J(¹¹⁹Sn^-13Cα) was observed in the 2.0 M CDCl₃ solution of Bu₂SnCl₂.