A series of 20-membered binuclear octaazamacrocyclic complexes, [M2LX2 X2 [where M = Co(II), Ni(II), Cu(II) and Zn(II); X = Cl, NO3] have been synthesized by metal ion controlled reaction between tris(2-aminoethyl)amine, tren and 1,3-dibromopropane in the presence of KOH in methanol. The proposed stoichiometry and the bonding in the macrocyclic moiety to metal ions alongwith the over all stereochemistry have been derived from the results of elemental analyses, conductivity data and the information revealed from FT-IR, 1H NMR, mass, UV-Vis i ble, and EPR spectral studies. An octahedral geometry has been envis aged 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-do nor atom of tren moiety coordinate to metal ion and the rest two coordina tion sites have been occupied by two bridging an ions.
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