Nickel(II) and copper(II) complexes of 5-o-tolyl-[1,3,4]-oxadiazole-2-thione and ethylenediamine: syntheses, spectral, and structural characterization

Abstract

The reaction of potassium [N′-(2-methyl-benzoyl)-hydrazinecarbodithioate [K⁺(H₂L)⁻] with metal acetate yielded M(H₂L)₂ (M = Ni, Cu), which on reaction with excess ethylenediamine (en) formed mononuclear mixed ligand complexes [Ni(en)₂(tot)₂] (1) and [Cu(en)₂](tot)₂ (2). The complexes have been characterized by elemental analyses, IR, magnetic susceptibility, and electronic spectral studies. Molecular structures of [Ni(en)₂(tot)₂] (1) and [Cu(en)₂](tot)₂ (2) showed 5-(o-tolyl)-[1,3,4]-oxadiazole-2-thione coordinated through oxadiazole nitrogen in 1 and ionically bonded via thiol sulfur in 2.

Keywords:

• 5-o-Tolyl-[1,3,4]-oxadiazole-2-thione
• Mixed ligand complexes
• X-ray structure
• Supramolecular architecture

Acknowledgment

Ram Dulare thanks UGC, New Delhi, for the award of a JRF.