Synthesis, structure and properties of ternary copper(II) complexes of ONO donor Schiff base, imidazole, 2,2′-bipyridine and 1,10-phenanthroline

• Published in: Polyhedron 2006-12, Vol.25 (17), p.3312-3318
• Main Authors: Patel, R.N., Singh, Nripendra, Gundla, V.L.N.
• Format: Article
• Language: English
• Subjects: Bidentate polypyridyl ligands; Cyclic voltammetry; Monodentate ligand; Schiff base; SOD; X-band e.p.r
• ISSN: 0277-5387
• DOI: 10.1016/j.poly.2006.06.017

Three new complexes [Cu(SAA)(ImH)] ( 1), [Cu(SAA)(bipy)] CH 3CN ( 2), [Cu(SAA)(phen)] ( 3) were characterized by elemental analysis, magnetic susceptibility, X-band e.p.r., electronic spectroscopy and cyclic voltammetry. Single crystal X-ray analysis of ( 1) has revealed the presence of a distorted square planar geometry (N 2O 2) and ( 2) has revealed the presence of a distorted square pyramidal (4+1) geometry. In both structures the ONO Schiff base occupies the basal plane. Magnetic susceptibility measurements at room temperature were in the range 1.79 ± 0.01 BM. Superoxide dismutase (SOD) activity of the present complexes were also measured and discussed. Reaction of copper(II) salt with salicylidene anthanilic acid (SAA), a tridentate ligand and imidazole (ImH), a monodentate ligand or bidentate polypyridyl ligands like 2,2′-bipyridine (bipy) or 1,10-phenanthroline(phen) in MeOH:MeCN (1:1 V/V) yields [Cu(SAA)(ImH)] ( 1), [Cu(SAA)(bipy)]CH 3CN ( 2) and [Cu(SAA)(phen)] ( 3) in ∼80% yield. These complexes were characterized by elemental analysis, magnetic susceptibility, X-band e.p.r., electronic spectroscopy and cyclic voltammetry. All the reported complexes show g ∥ > g ⊥ > 2.0023 and G values falling within the range of 2–4 are consistent with a d x 2 - y 2 ground state in a square planar or square pyramidal geometry. Single crystal X-ray analysis of 1 has revealed the presence of a distorted square planar geometry (N 2O 2) and 2 has revealed the presence of distorted square pyramidal (4 + 1) geometry. In both structures the ONO Schiff base occupies the basal plane. Magnetic susceptibility measurements at room temperature were in the range 1.79 ± 0.01 BM. Superoxide dismutase (SOD) activity of the present complexes were also measured.