ORGANOTIN TRANSITION-METAL COMPLEXES OF 18-MEMBERED BINUCLEAR HEXAAZAMACROCYCLES - SYNTHESIS AND CHARACTERIZATION

The template condensation reaction of diethylenetriamine with glyoxal or biacetyl using dialkyltin(IV) dichloride and divalent transition me tal ions resulted in the formation of a new series of hetero-binuclear hexaazamacrocyclic complexes R(2)SnMLX(2) where L = L(1), L(2), L(3), L(4); R = CH3, C2H5, M = Cu(II), Ni(II) and Zn(II); X = Cl or NO3. Th e structure and bonding these macrocyclic ligands have been studied by elemental analyses, IR, H-1 NMR, EPR and electronic spectral studies, magnetic susceptibility and molar conductance data. The coordination geometry around the metal ions is octahedral in all complexes and each metal ion is coordinated to the imine nitrogen and the bridging nitro gen of the diethylenetriamine moiety.