Synthesis and characterization of macrocyclic and polymeric Schiff base complexes derived from related macrocyclic ligands in the presence of Ni(II) and Cu(II)

Abstract

Four macrocyclic Schiff base ligands (L1, L2, L3, and L4) have been prepared. In the presence of Copper(II), original macrocycles were converted to the three new binuclear polymeric complexes [Cu2L 2 1′ ](NO3)2, [Cu2L 2 2′ ](NO3), and [Cu2L 2 3′ ](NO3)2. But in the presence of Nickel(II), macrocyclic rings remained unchanged and Schiff base complexes of [NiL1(CH3CN)2(CH3OH)2](ClO4)2 and [NiL4](NO3)2 were synthesized. All ligands and their related complexes were characterized by elemental analysis, IR spectroscopy, in the case of ligands 1H, 13C NMR and EI-Mass and for [Cu2L2′](NO3)2 and [NiL1(CH3CN)2(CH3OH)2](ClO4)2 complexes X-ray crystal structure determination have been performed. Crystal structure showed 1D zigzag polymer for [Cu2L 2 1′ ](NO3)2 and macrocyclic structure for [NiL1(CH3CN)2(CH3OH)2](ClO4)2 complexes. The ligands and related polymeric complexes were screened for their antibacterial activities against six bacterial strains and the complexes showed antibacterial effects.