Synthetic, spectroscopic and biocidal aspects of sixteen to twenty two-membered tetraazamacrocyclic complexes of tin(II)

Abstract

The template condensation of malonic, succinic, glutaric, adipic or phthalic acid with 1,3-phenylenediamine in the presence of tin (II) chloride resulted in the isolation of macrocyclic complexes of the type [Sn (N₄macⁿ)Cl₂]. These complexes have been characterized by chemical analysis, IR, ¹H NMR and ¹¹⁹Sn NMR spectral studies, X-ray powder diffraction, molecular weight determinations and conductivity measurements. An octahedral geometry around the tin atom is suggested for [Sn (N₄macⁿ)Cl₂] complexes. The biological activities of all the complexes have been studied by screening them against organisms <i>E. coli,</i> <i>S. aureus, F. oxysporum </i>and <i>A.</i> <i>alternata </i>and the results have been compared.