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H. Sugihara, T. Okada, and K. Hiratani
[Analytical Sciences, Vol.9, p.593, 1993]
The preparation of 1,10-phenanthroline derivatives and 4,7-diphenyl-1,10-phenanthroline derivatives as neutral carriers for ion-selective electrodes and the properties of the title electrodes are described in detail. A log K_{Li,Na} value of -3.1 was obtained for a Li^{+}-selective PVC membrane electrode based on 2,9-dibutyl-1,10-phenanthroline. This value is superior to those reported so far. The electrodes also showed excellent selectivity coefficients for Li^{+} relative to K^{+}, Mg^{2+}, and Ca^{2+}. The effects of substituents at the 2- and 9- positions of the carriers on the selectivity are discussed.
