SYNTHESIS AND CHARACTERIZATION OF BIS(MACROCYCLIC) COMPLEXES BASED ONTHE 13-MEMBERED PENTAAZA UNIT

The template condensation of triethylenetetraamine, formaldehyde and b enzidine in 2:4:1 molar ratio results in new types of binuclear bis(ma crocyclic) complexes, [M2LX4] [M = Mn, Co, Ni, Cu, Zn, X = Cl or NO3] in which two pentaazacyclotetradecane subunits are linked by a bipheny l group attached to an uncoordinated benzidine nitrogen atom. The comp lexes synthesized were characterized by IR, H-1 NMR, UV/VIS, EPR, cond uctivity, magnetic moments and analytical data. The observed low condu ctance values of all these complexes suggests their non-ionic characte r and that all the complexes exhibit octahedral geometry around the me tal ions.