M. Shakir et al., PREPARATION AND STRUCTURAL CHARACTERIZATION OF 14-16-MEMBERED PENDENTARM MACROCYCLIC COMPLEXES OF TRANSITION-METAL IONS, Polyhedron, 14(10), 1995, pp. 1277-1282
Template condensation reaction of ethylenediamine or propylenediamine,
formaldehyde and benzidine in 1:2:1 molar ratio in methanol medium re
sulted in the formation of a new series of pendent arm hexaazamacrocyc
lic complexes of the type [ML(1)Cl(2)] or [ML(2)Cl(2)] (M(II) = Fe-II,
Co-II, Ni-II, Cu-II and Zn-II). These polycrystalline compounds are s
oluble in DMSO and have been characterized by IR,H-1 NMR, EPR and elec
tronic spectral studies, and conductivity and magnetic susceptibility
measurements. An octahedral geometry is suggested for all the complexe
s, where two coordination sites are occupied by chloride ions and the
other four by secondary amines.