Studies on Metal Ion Complexes with Some Substituted Isoxazoline and Pyrazolines pH Metrically

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The interaction of Ba(ll), Ni(ll), Cu(ll), Zn(ll) and U02(ll) metal Ions with 3-(2-hydroxy-3-bromo-5-methylphenyl)-5-(4-methoxyphenyl)lsoxazoline (Ligand 1), 3-(2*hydroxy-3-iodo-5-methylphenyl)-1,5-diphenylpyrazoline (Ligand 2) and 3-(2-hydroxy-3-bromo-5-methylphenyl)-1,-3-diphenylpyrazoline (Ligand 3) have been investigated by pH metric technique at 1 x 103 M ionic strength and at 27 ± 0.1 °C in 70% alcohol (methanol) water mixture. The data obtained were used to compare and evaluate the values of proton ligand stability constants (pk) and metal ligand stability constants (log k), it is observed that Ba(ll), Ni(il), Cu(ll), Zn(il) and UO2(ll) metal ions forms 1:1 and 1:2 complexes with the all three ligands.

pH metric technique; ionic strength; water mixture