Preparation and characterization of mono- and hetero-dinuclear complexes with a dicompartmental macrocyclic ligand containing hexa- and penta-coordination sites

Abstract

A novel hetero-dinucleating macrocyclic Zn(II)–Ni(II) complex was prepared by a stepwise procedure. The prepared mono- and dinuclear macrocyclic complexes were characterized by elemental analysis, IR, NMR spectroscopies, and molar conductance measurements. Characterization results confirm the expected C 2 symmetry geometry for mononuclear macrocyclic zinc complex with trans disposed pyridyl ligands. In contrast, the X-ray crystal structure of the dinuclear macrocyclic Zn(II)–Ni(II) complex reveals a C 1 symmetry geometry so that, Zn(II) ion is located in six-coordination site with cis disposed pyridyl ligands and the penta-dentate compartment is occupied by Ni(II) ion in a square pyramidal geometry. The thermogravimetric analysis (DTA/TG) of binuclear complex is also investigated.