Synthesis, characterization and crystal structure of a monomeric and a macrocyclic copper (II) complex with a large cavity using benzylacetylacetone ligand

Abstract

The bidentate ligand benzylacetylacetone was used to synthesize the Cu(II) complexes 1 and 2 without and with 4,4 ′-bipyridine ligand, respectively. The complexes were characterized by analytical and spectroscopic studies. The mononuclear complex [Cu(C 10H 9O 2) 2] ( 1) has been synthesized by the reaction of copper acetate with the ligand whereas the tetranuclear complex [Cu 4(4,4 ′-bpy) 4(C 10H 9O 2) 4(C 2H 3O 2) 4] ( 2) has been synthesized by the reaction of copper acetate with the ligand followed by the addition of 4,4 ′-bipyridine. The X-ray analysis shows that the complex 1 has square planar geometry and the complex 2 has square pyramidal geometry around the metal centers. The thermogravimetric studies showed that the complexes undergo decomposition in multiple steps.