Abstract
Brine shrimp lethality of a new series of 16 to 26-membered macrocycles of iron(II) containing
tetraaza groups and prepared by the template condensation reaction of diacarboxylic acids (malonic, succinic,
glutaric or adipic) with 2,6-diaminopyridine and diethylenetriamine in 1:2:2 molar ratios have been studied.
Structures and bonding of the macrocyclic complexes have been proposed based on elemental analyses, IR,
electronic, X-ray and mass spectral studies. An octahedral geometry for these complexes has been proposed
as the binding sites are the nitrogen atoms of the macrocycles. The formation of the complexes as