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A B S r n C T 1,8-anthraquinono-l8-crown-6 and 10-[(2,4-dinitrophenyl)azol-9-liydroxy-l,&anthraceno-18-crown-6 were prepared from 1, 8-dichloroanthraquinone and used in the development of ion-selective electrodes. The electrodes based on 10-[(2,4-dinitrophenyl)azo]-~-hydroxy-1,8-anthraceno-18-crown-6 displayed better selectivity for potassium over sodium and had fewer interferences. The differences and simdarities between the ionophores, as well as the optimum conditions for the preparation of the electrodes are discussed.KEY WORDS: Ionophore, ion selective electrode, anthraquinone, potassium. Crown ethers containing the anthraquinone nucleus have been prepared previously because of the interesting spectroscopic and electrochemical properties of the anthraquinone system. Specifically, Dix and Vogtle synthesized anthraquinonophanes by reacting alizarin with poly(ethy1ene glycol) ditosylates [61, Further, Buhleier and Vogtle bridged the l,&position of the anthraquinone system with a 1, o-dithiolate to yield a dithia-anthraquinonophane [71. Takagi and coworkers prepared similar reagents by coupling alizarin to monoaza-crown ethers by the Mannich reaction [8]. The resulting chromogenic crown ethers are potentially useful as ion-specific dyes (chromoionophores), and were used for the selective extraction and photometric determination of alkali metal cations. In addition, monoazaPermanent address: Warsaw Agricultural [Jniversity, I . O D U C 7 7 O N

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