Structures of Nal Complexes of 16-Membered Azo-and Azoxycrown Ethers. Correlation of Crystal Structure and Carrier-Doped Membrane Electrode Selectivity

Abstract

Sodium iodide complexes of 16-membered dibenzoazocrown ether (complex I) and dibenzoazoxycrown ether (complex II) have been synthesized and their structures determined by X-ray method. Stoichiometry of both complexes is 1:1 (ligand: salt); the cation is coordinated to oxygen atoms of the oxyethylene moieties and to one nitrogen atom of azo group in the first, or to oxygen atom of the azoxy group in the last complex. Selectivities of membrane electrodes doped with ion carriers, including 16-membered azocrown and azoxycrown ethers have been compared and discussed mainly in terms of features of crystal structures of carrier complexes.