The stability constants have been determined for the reaction products of 2-,3-,4-, and 2-sulphonic (4-methyl) phenylhydrazone pentan-2, 4-dione (2SPHA, 3-SPHA, 4-SPHA and 2-S (4-Me)PHA) ligands with tervalent lanthamide ions. The measurements have been made at constant temperature 30oC and ionic strength 0.1 M in aqueous medium. Plotting log B2 (overall) stability constant) against the atomic number of the lanthanide elements showed linear relationship from La to Eu with change in stability of 0.12, 0.24, 0.26 and 0.1 for 2-, 3-, 4-and 2-S(4-Me) PHA ligands respectively. After Gd, the stability remains nearly constant. The effect of substitution of sulphonic groups was discussed. The relation between log B2 and the pK's values of the organic ligands was also investigated.
A A RAMADAN ,M S ABDL-MOEZ ,A M EL-ATRASH ,B A SHETARY ,G A EL-INANY ,
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