The stability constants of the complexes formed between trivalent ions and related carboxyphenyllhydraz0-j3,(Jiketones ligands are reported at 300C and at constant ionic strength (O.IM KNO ) in 75% dioxane-water.The dtmity of different ligands for complexation with lanthanide ions reaches its highest value with ortho-carboxyphenylhydrazo-benzoylacetone; the lowest aff'mity is attained in the case of m-carboxyphenylhydr8zodiethyl malonate ligands.The relation between the overall stability constants "{j2"of chelate compounds and both the atomic number of the lanthanide and 1: pKa's of the ligands were investigated.
A M ZAHRA ,M S MOEZ ,A A RAMADAN ,B A EL SHETARY ,
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