Formation of cobalt, nickel and copper complexes with murexide in ethanol-water mixtures |
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| Authors: | Shamsipur M Esmaeili A Amini M K |
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| Affiliation: | Department of Chemistry, Shiraz University, Shiraz, Iran |
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| Abstract: | The complexation reactions between murexide and Co2+, Ni2+ and Cu2+ in C2H5OH-H2O mixtures have been investigated spectrophotometrically. The formation constants of the 1:1 complexes formed increase in the order Co2+ < Ni2+ < Cu2+ for all solvent mixtures studied, and log Kf is a linear function of the mole fraction of ethanol. The heat of complexation was determined calorimetrically for the nickel and copper complexes. The values of ΔH° and ΔS° are solvent-dependent, and all three complexes have negative ΔH° and positive ΔS° values. |
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