Cobalt(II), nickel(II) and copper(II) complexes of potentially terdentate N-(2′-picolyl)-2-pyridylacetamide

Abstract

Abstract Cobalt(II), nickel(II), and copper(II) complexes of N-(2′-picolyl)-2-pyridylacetamide(ppaH) have been studied by means of magnetic moments, and infrared and electronic spectra. The amide group of ppaH is coordinated through its oxygen atom in complexes such as Ni(ppaH)2X2.nH2O (X  Cl, Br or NCS) and [Co(ppaH)2(H2O)2](ClO4)2, where ppaH acts as an N,O-bidentate ligand. The cobalt and nickel complexes are six-coordinate except for [Co(ppaH)Br2].H2O and [H2(ppaH)].[CoCl4], which are tetrahedral. On the other hand, in the copper complexes Cu(ppa)Cl.2H2O and [H3O].[Cu(ppa)SO4] the amide group is coordinated through its deprotonated nitrogen atom and the ligands acts as an N,N,N-terdentate one.