Analytical Sciences

Anion Selectivities of Dibutyltin Dihalides as NeutralCarriers for Ion-Selective Electrodes

Takayo MORIUCHI-KAWAKAMI, Hiroshi AOTO, Naotake TAKEDA, Keiichi FUJIMORI, and Yasuhiko SHIBUTANI

Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, Omiya, Asahi, Osaka 535-8585, Japan

Di-n-butyltin dihalides (Bu₂SnY₂, Y=Cl, I, OMe) behaved as neutral carriers for anion-selective electrodes. A variety ofselectivity patterns have been obtained by using Bu₂SnY₂ which differ in the electronegative substituents Y on the Snatom. However, all electrodes containing Bu₂SnY₂ provided the highest degree of selectivity for the SCN^- ion. Theinteraction of Bu₂SnY₂ with the SCN^- ion was studied in the organic solution by means of ¹³C NMR spectroscopy. In thecase of the addition of NaSCN, a significant increase of the value of ¹J(¹¹⁹Sn-¹³Ca) was observed in the 2.0 M CDCl₃solution of Bu₂SnC_l2.

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