Synthesis and formation of a new vic-dioxime complexes

Abstract

In this study, N-(4-{[(2-ethyl-2-methyl-1,3-dioxolan-4-yl)methyl]amino}butyl)-N′-hydroxy-2-(hydroxyimino)ethanimidamide (L¹H₂) and N′-hydroxy-2-(hydroxyimino)-N-(4-{[(2-methyl-2-phenyl-1,3-dioxolan-4-yl)methyl]amino}butyl)ethanimidamide (L²H₂) were synthesized by the reaction of N-[(2-ethyl-2-methyl-1,3-dioxolan-4-yl)methyl]butane-1,4-diamine or N-[(2-methyl-2-phenyl-1,3-dioxolan-4-yl)methyl]butane-1,4-diamine and anti-chloroglyoxime. Ligands form mononuclear complexes [(LH)₂M] with a metal : ligand ratio of 1 : 2 with M = Co(II)(H₂O)₂, Ni(II) and Cu(II). Zn(II) forms complexes [(LH)(H₂O)(Cl)Zn] with a metal : ligand ratio of 1 : 1. The Co(II) complexes of the ligands are proposed to be octahedral with water molecules as axial ligands, the Ni(II) and Cu(II) complexes are proposed to be square planar, and the complexes of Zn(II) are tetrahedral. A chloride ion and a water molecule are also coordinated to the Zn(II) ion. Structural assignments are supported by elemental analyses, IR, ¹H- and ¹³C-NMR spectra, UV–Visible spectroscopy, molar conductivity, magnetic susceptibility measurements and thermogravimetric analyses (TGA).

Keywords:

• Synthesis of vic-dioxime complexes
• Transition metal complexes