Abstract
Article history: Received March 27, 2013 Received in Revised form August 27, 2013 Accepted 3 September 2013 Available online 4 September 2013 The dicompartmental macrocyclic ligand (L ) was prepared by [1:1] cyclic condensation of N,N′-dimethyacetate-N,N′-ethylene-di(5-methyl-3-formyl-2-hydroxybenzylamine with 1,3diaminopropane. The ligand includes dissimilar N(amine)2O2 and N(imine)2O2 coordination sites sharing two phenolic oxygen atoms and containing two methyl acetate pedant arms on the amine nitrogen donor atoms. A series of monoand bimetallic complexes were synthesized and characterized on the basis of elemental analysis, molar conductance measurement, IR and UVVis spectroscopy techniques. It was found that during the cyclization process the copper (II) displaced from the N(amine)2O2 to the N(imine)2O2 coordination site and one of the methyl acetate pedant arms is dissociated. The heterodinuclear complex of [ZnLCu(-OAc)] was prepared by a transmetallation reaction on the [ZnLZn(-OAc)] by Cu(II). The characterization results showed that the two metal ions are bridged by two phenolic oxygen atoms and an acetate group, providing distorted five-coordination geometries for the both metal ions.
Highlights
In the last decade, great attention was paid to the design and synthesis of dicompartmental ligands capable of forming macrocyclic or acyclic complexes with similar or dissimilar metal ions[1]
The aim of the present study involves the synthesis of novel unsymmetrical mono- and homo/heterobimetallic Cu(II) and Zn(II) complexes utilizing new dicompartmental acyclic and macrocyclic ligands possessing two contagious hexa- and tetra-coordination sites
The synthetic objective of this research has been achieved, the characterization results showed that the propionate pendant pendent arms are free from coordination
Summary
Great attention was paid to the design and synthesis of dicompartmental ligands capable of forming macrocyclic or acyclic complexes with similar or dissimilar metal ions[1]. Interest in this topic is due partly to their potential applications to mimic bimetallic biosides of the metalloenzymes[1] and their interesting catalytic properties[2]. Among many different types of dicompartmental ligands, phenol-based ligands having two metal binding sites sharing two phenolic oxygen atoms have been proved as more relevant for modeling of the active sites of many metallobiosites to hosting and carrying small molecules[3] Synthesis of such compartmental ligands and their metal complexes are desirable. Copper (II) complexes are the beacon for modeling, and they serve as bioinorganic model compounds in enzymatic reactions, and in catalytic synthetic oxidation reactions[5]
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