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New Chromogenic Azothiacrown Ethers-Synthesis and Properties

Szczygelska-Tao J., Biernat J. F.

Polish Journal of Chemistry

2002

Vol. 76 / nr 7

931-936

New chromogenic azocrown ethers possessing sulfur atoms and two azo- groups in the macrocycle are described. The synthesized macrocycles have been applied as ion carriers in ion-selective membrane electrodes. Their selectivity and sensitivity were studied towards alkali and transition metal cations. Complexation of the compounds was studied by UV-Vis spectrophotometry in water-dioxane (1:1; v/v) solvent system. Stability constants of copper and silver complexes were determined. Contrary to oxygen analogues, the azothiacrowns do not form complexes with alkali or alkaline earth metal cations.