SYNTHESIS, CHARACTERIZATION, ANTIMICROBIAL AND PESTICIDAL ACTIVITY OF ORGANOARSENIC(III) AND ORGANOANTIMONY(III) COMPLEXES WITH N∩S DONOR LIGANDS

Some new Sb(III) and As(III)  complexes of  N∩S donor ligands  N’-[1-(2-oxo-2H-chrome-3yl-ethylidene]  – hydrazinecarbodithionic acid methyl ester (L1H)  and N’ – [1-(2-oxo-2H-chrome-3yl – ethylidene] -hydrazinecarbodithionic acid benzyl ester (L2H) have been synthesized. All the synthesized compounds were characterized by elemental analyses, melting point determinations and a combination of electronic, IR, 1H NMR, and X-ray diffraction spectroscopic techniques. These studies showed that the ligands coordinated to   organoantimony and organoarsenic in a monobasic bidentate manner through sulfur and nitrogen donor system. Thus, tetra and pentacoordinated environments around the antimony and arsenic atom have been proposed. In order to evaluate the effect of metal ions upon chelation, both the ligands and their complexes have been screened for their antimicrobial activity against the various pathogenic bacterial and fungal strains. The results indicate that the metal complexes are more potent antimicrobial agents than the parent ligands.  Further, the ligands and their corresponding metal complexes have been tested for their pesticidal activity against the Corcyra cephalonica.  The results of pesticidal screening are quite promising.