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2 Polish Journal of Chemistry

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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.

Crown Ethers with Azo or Azoxy Unit and Sulfur Atom(s) in 16-Membered Macrocycle

Szczygelska-Tao J., Kravtsov V. Ch., Biernat J. F.

Polish Journal of Chemistry

2001

Vol. 75, nr 7

991-1000

16-membered crown ethers bearing oxygen and sulfur atom(s) and an azo or azoxy group in the macrocycle have been synthesized by reductive macrocyclization of respective dinitropodands. Behavior of the compounds as ionophores in ion-selective membrane electrodes has been studied. The structure of 16-membered azothiacrown ether has been solved by X-ray analysis.