Tin(II) complexes of tetraaza macrocycles have been prepared by template process using malonic, succinic and adipic acids with 1,2-diaminoethane and 1,3-diaminopropane. The reaction proceed smoothly to completion. The complexes were characterized by elemental analyses, molecular weight determinations, infrared and 'H NMR spectral studies. The elemental analyses are consistent with the formulation of complexes as [Sn(MacroC n )Cl 2 ]. All the complexes are stable and monomeric as indicate by

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... cular weight determinations. The spectral studies confirm the proposed framework of the new macrocyclic complexes and indicate an octahedral environment around the central tin atom. The potential binding sites being the nitrogen atoms of the ligand. The biological activities of starting materials and their metal complexes have been studied by screening the compounds against Fusarium oxysporum and Aspergillus niger.