Synthesis and spectral characterization of Ni-II, Cu-II and Zn-II complexes of trioxadiazamacrocycles derived from 1,13-diamino-4,7,10-trioxatridecane and benzil or 4,4 '-dimethylbenzil

1 + 1 Cyclocondensation of alpha-diketones such as benzil, 4,4'-dimethylbenzil with 1,13-diamino-4,7,10-trioxatridecane in the presence of Ni-II, Cu-II and Zn-II as templates has yielded complexes of the type [NiLCl]Cl, [CuL(NO3)](NO3) and [ZnLCl2] (where L = 17-membered N2O3 macrocycle). These complexes have been characterized by elemental analyses, molar conductances, FAB mass, IR, electronic and H-1 NMR spectra.