A dinuclear and a 1D zigzag chain of copper(II) complexes with N2O donor Schiff base ligand and psuedohalides (azide and dicyanamide): Studies on catecholase-like activity

• A dinuclear and a 1D zigzag chain of Cu(II) with N2O Schiff base and pseudohalides.
• The geometry around copper center is square base.
• Both complexes exhibit catecholase-like activity.

Two copper(II) complexes, [Cu2L2(μ1,1-N3)2]·2CH2Cl2 (1) and [CuL(μ1,5-dca)]n (dca = dicyanamide) (2) have been synthesized using a tridentate Schiff base ligand, 1-[(3-methylamino-propylimino)-methyl]-naphthalen-2-ol (HL) and azide or dicyanamide as co-ligand. Both complexes are characterized by elemental analysis, IR and UV–Vis spectroscopy and single crystal X-ray diffraction studies. The coordination geometry around the copper center in complex 1 is as an elongated (4 + 1) square pyramid and that in complex 2 is square planar with the tridentate Schiff base ligand in the basal plane. Complex 1 is a centrosymmetric dimer in which metal centers are connected by the double μ-1,1-azido bridges. On the other hand, complex 2 is a 1D zigzag chain in which metal centers are connected by μ1,5-N(CN)2 ligands. The catecholase like activity for both complexes have been studied by using 3,5-di-tert-butylcatechol (3,5-DTBC) as the substrate. Complex 1 shows higher activity (kcat = 40.8 h−1) than that of complex 2 (27.6 h−1) towards such oxidation reaction.

A dinuclear and a 1D zigzag chain of copper(II) complexes have been synthesized using a mono-condensed N2O donor Schiff base ligand and psuedohalides (azide and dicyanamide) as coligands. The catecholase-like activity of both complexes has been studied in detail.Figure optionsDownload as PowerPoint slide