Synthesis and structural characterization of a new Schiff base macrocyclic ligand containing a piperazine head unit and its metal complexes. Crystal structure of the Co(II) complex

A new macrocyclic Schiff base ligand, L, was synthesized by the condensation reaction of 1,4-bis(2-formylphenyl)piperazine and 1,4-diaminobutane in acetonitrile. The Schiff base ligand was characterized by elemental analysis, IR and mass spectroscopy. Three new Co(II), Cu(II) and Zn(II) complexes, [CoL(NO3)]ClO4, [CuL(NO3)]ClO4 and [ZnL(NO3)]ClO4, were prepared and characterized by elemental analyses, IR, FAB-MS, conductivity measurements and in the case of [ZnL(NO3)]ClO4 by 1H NMR spectroscopy. The X-ray crystal structure of [CoL(NO3)]ClO4 showed that the complex contains Co(II) in a distorted octahedral geometry with an N4O2 core. Also, theoretical studies on the interaction of the nitrate ion and metal ions were carried out.

Graphical abstractA new macrocyclic Schiff base ligand, L, was synthesized by the condensation reaction of 1,4-bis(2-formylphenyl)piperazine and 1,4-diaminobutane in acetonitrile. The Schiff base ligand was characterized by elemental analyses, IR, and mass spectroscopy. Three new Co(II), Cu(II) and Zn(II) complexes, [CoL(NO3)]ClO4, [CuL(NO3)]ClO4 and [ZnL(NO3)]ClO4, were prepared and characterized by elemental analysis, IR, FAB-MS and conductivity measurements, and in the case of [ZnL(NO3)]ClO4 by 1H NMR spectroscopy. The X-ray crystal structure of [CoL(NO3)]ClO4 showed that the complex contains Co(II) in a distorted octahedral geometry with an N4O2 core. Also, theoretical studies on interaction of the nitrate ion and metal ions were carried out.Figure optionsDownload full-size imageDownload as PowerPoint slide