Binuclear Octaazamacrocyclic Complexes of Cobalt(II),Nickel(II),Copper(II) and Zinc(II) Derived from Tris(2-aminoethyl)amine and 1,3-Dibromopropane;Synthesis and Characterization

摘要

A series of 20-membered binuclear Octaazamacrocyclic complexes,[M_2LX_2]X_2 [where M=Co(II),Ni(II),Cu(II) and Zn(II);X=Cl,NO_3] have been synthesized by metal ion controlled reaction between tris(2-aminoethyl)amine,tren and 1,3-dibroniopropane in the presence of KOH in methanol.The proposed stoichiometry and the bonding in the macrocyclic moiety to metal ions alongwith the overall stereochemistry have been derived from the results of elemental analyses,conductivity data and the information revealed from FT-IR,~1H NMR,mass,UV-Visible,and EPR spectral studies.An octahedral geometry has been envisaged for Co(II),Ni(II) and Zn(II) complexes while a distortion in octahedral geometry has been noticed for Cu(II) complexes,where all four N-donor atom of tren moiety coordinate to metal ion and the rest two coordination sites have been occupied by two bridging anions.