Stability Constant of Transition Metal Ions Complex with l-Carboxamido-3,5-diaryl-4-aroylpyrazoles

摘要

The interaction of transition metal ions Co(II),Cu(II) and Ni(II) with l-carboxamido-3-(2-hydroxy-5-chlorophenyl)-4-ben-zoyl-5-phenylpyrazole (L1) and l-carboxamido-3-(2-hydroxy-5-chlorophenyl)-4-benzoyl-5-(4-methoxy phenyl)-pyrazole (L2) have been investigated by pH-metric technique at 0.1 M ionic strength and at 27+- 0.1 deg C in 70% DMF-water medium.Co(II),Cu(II) and Ni(II) ions form 1 :1 and 1 :2 complexes with ligands L1 and L2,respectively.Ligand L1 is found a better chelating agent than L2 because of higher values of log K1 and K2