DEPROTONATED AND NON-DEPROTONATED COMPLEXES OF N-(2-AMINOPHENYL) PYRIDINE-2-CARBOXAMIDE AND N-(3-AMINOPHENYL) PYRIDINE-2-CARBOXAMIDE WITH Co(II), Ni(II), Cu(II) AND Pd(II)

Abstract

New deprotonated and non-deprotonated chelates of N-(2-aminophenyl)pyridine-2-carboxamide and N-(3-amino phenyl)pyridine-2-carboxamide with Co(II), Ni(II), Cu(II) and Pd(II) have been prepared. Properties, molar conductance measurement, magnetic moment and spectral (IR and visible) data are discussed in terms of possible structural types and the nature of the bonding. The metal ions used promote amide deprotonation on coordination with N-(2-aminophenyl)pyridine-2-carboxamide; only Pd(II) causes the same effect with N-(3-aminophenyl)pyridine-2-carboxamide. The neutral amide group is coordinated to the metal ions through oxygen, while an N(amide)-coordination is assigned for the deprotonated complexes.