Synthesis and Solution Complexation Studies of a new Schiff base Ligand

Document Type : Research Paper




A new Schiff base ligand, 2,2'-{pyridine-2,6-diylbis[nitrilo(E)methylylidene]}bis(4 bromophenol),
has been synthesized by reaction of the 2,6-diamino pyridine with 5-bromo salicylaldehyde at ethanol
under refluxing. The structure of the synthesized compound resulted from the IR, 1HNMR, MS and
UV spectroscopy and elemental analysis data. Formation Constant (kf) value of it’s complexes with
Cu2+, Ni2+, Cd2+, Co2+ and Hg2+ has been determined Conductometrically. The formation constants of
the resulting 1:1 complexes have been calculated from the computer fitting of the molar conductance
- mole ratio data at different temperatures. The stability of the complexes to vary in acetonitrile
solvent was in the order of Cu2+ > Cd2+ > Co2+ > Hg2+ > Ni2+. The enthalpy and entropy changes of
the complexation reactions have been evaluated from the temperature dependence of formation