8-carboxyphenyl azodiethylmalonate was studied pH-metricallY in different aqueous organic solvents. The pK1&pK2 were calculated to be 4.81 & 10.97,5.60 & 12.21 and 5.15 & 11.57 in 50% and 80% aqueous ethanol and 50% aqueous dioxan respectivily. The stability constants of Co(ll), Ni(II) and Cu(II) were also calculated in the same solvents. It was found that copper foms 1:2 complex in all mixed solvents, while nickel and cobalt fom 1: 1 complexes. There is a good relation between pK;S and dielectric constant of solvents. The pK&pK of ligand and complexes in water can be obtained graghically.
B A EL SHETARY ,W H MAHMOUD ,M F EL SHAHAT ,
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