Synthesis, properties and molecular structures of iron(III), cobalt(II), nickel(II), copper(II), copper(I) and zinc(II) complexes with N,N-bis(pyrazol-1-ylmethyl)benzylamine

Abstract

A newly prepared ligand, N,N-bis(pyrazol-1-ylmethyl)benzylamine (L) reacted with metal ions to form [FeLCl₃], [NiL(NCS)₂(MeOH)], [MLX₂](M = Co^II, Cu^II or Zn^II, X = Cl^–, Br^– or NCS^–) and [(CuLI)₂]. The crystallographically determined structures of [CoLCl₂] and [CoL(NCS)₂] reveal the co-ordination sphere of cobalt(II) to be intermediate between distorted tetrahedral and trigonal bipyramidal. In [NiL(NCS)₂(MeOH)] the co-ordination sphere of nickel(II) ion is distorted octahedral while that of copper(II) in [CuLCl₂] is distorted square pyramidal. The complex [(CuLI)₂] displays distorted tetrahedral geometry around copper(I), and [ZnLBr₂] shows distorted tetrahedral geometry around zinc(II).