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NUCLEAR MAGNETIC RESONANCE AND SPECTROPHOTOMETRY STUDIES OF THE BINDING OF MUREXIDE WITH LITHIUM, SODIUM AND POTASSIUM IONS IN BINARY DIMETHYLSLLFOXIDE-ACETONITRILE MIXTURES

Department of Chemistry, Razi University, Kermanshah, Iran  Abstract The complexation reactions between murexide and Li, Na and K ions in different dimethylsulfoxideacetonitrile mixtures were studied by both spectrophotometric and Li-NMR methods at 25 °C. The stoichiometry of the complexes was found to be 1:1. The formation constants of the resulting complexes, determined by both experimental techniques used, were found to be in satisfactory agreement. In all solvent mixtures studied, the stability of murexide complexes varied in the order Na > Κ > Li . There is an inverse relationship between the complex formation constants and amount of dimethylsulfoxide in the mixed solvent. A linear relationship was observed between log Kf for all complexes and the mole fraction of acetonitrile in solvent mixtures.