SYNTHETIC AND BIOLOGICAL ASPECTS OF SOME HETEROCHELATES OF DIOXOMOLYBDENUM(VI) WITH NITROGEN-SULFUR DONOR LIGANDS

Octahedral heterochelates of Mo(IV), synthesised by using two differen t ligands of heterocyclic aldehydes, (2-furanyl)methanal and (2-pyridi nyl)methanal and ketones, 1-(2-furnayl)ethanone, 1-(2-thienyl)ethanone , 1-(2-pyridinyl)ethanone and 1-(2-naphthenyl) ethanone are described. The 1:1:1 molar reactions of dioxobis(2,4-pentanedionato)molybdenum(V I) with these ligands produced coloured solids. The structural feature s of these molybdenum complexes were explored by IR, H-1 NMR, C-13 NMR , electronic measurements and molecular weight determinations. An octa hedral arrangement of ligands around the central molybdenum atom is pr oposed. Some of the ligands and their heterochelates have been screene d for their biological activity on several pathogenic fungi and bacter ia and the data show good activity of these complexes.