Synthesis and characterization of ML and ML2 metal complexes with amino acid substituted bis(2-picolyl)amine ligands

Abstract

Metal complexes with ML or ML₂ stoichiometry have been isolated in the reaction of Zn(NO₃)₂, ZnBr₂ or M(NO₃)₂/NaBF₄, M = Zn(II), Co(II) or Ni(II), with either amino acid or amine substituted tridentate nitrogen ligands based on bis(2-picolyl)amine (bpa) or bis(2-quinaldyl)amine (bqa). The stoichiometry (M : L = 1 : 1 or 1 : 2) and stereochemistry (mer, trans-fac or cis-fac) of the products have been studied by NMR and IR spectroscopy, X-ray single crystal analysis and quantum-chemical calculations with an implicit SMD solvation model.