Complexation and Adsorption Studies of 27-Membered Dioxadiazapentathia Macrocycles with Some Transition Metals

Abstract

The metal ion-binding properties of two 27-membered macrocycles with N₂S₅O₂ donor atoms 1 and 2 were investigated using solvent extraction experiments. In order to explain complexation behavior of macrocycles, extraction of ions in the interfacial region of liquid-liquid phase was modeled by Langmuir adsorption isotherm. The macrocycles 1 and 2 extracted Ag⁺ metal ion up to 95% to the dichloromethane and chloroform phase effectively. The Ag⁺ ion adsorption capacities of macrocycles 1 and 2 were obtained as 75% and 98% at 20°C, respectively.

Keywords:

• silver (I)
• mixed-donor macrocycle
• solvent extraction
• interfacial adsorption

ACKNOWLEDGMENTS

Elif Ersöz, Tuğba Buldem, Hatice Özdemir, and İbrahim Gürler (Department of Chemistry, Osmaniye Korkut Ata University) are gratefully acknowledged for their assistance.