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

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) 2 X 2· nH 2O ( X = Cl, Br or NCS) and [Co(ppaH) 2(H 2O) 2](ClO 4) 2, where ppaH acts as an N,O-bidentate ligand. The cobalt and nickel complexes are six-coordinate except for [Co(ppaH)Br 2]·H 2O and [H 2(ppaH)]·[CoCl 4], which are tetrahedral. On the other hand, in the copper complexes Cu(ppa)Cl·2H 2O and [H 3O]·[Cu(ppa)SO 4] the amide group is coordinated through its deprotonated nitrogen atom and the ligand acts as an N,N,N-terdentate one.