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

Octahedral heterochelates of Mo(IV), synthesised by using two different ligands of heterocyclic aldehydes, (2-furanyl)methanal and (2-pyridinyl)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(VI) with these ligands produced coloured solids. The structural features of these molybdenum complexes were explored by IR, H-1 NMR, C-13 NMR, electronic measurements and molecular weight determinations. An octahedral arrangement of ligands around the central molybdenum atom is proposed. Some of the ligands and their heterochelates have been screened for their biological activity on several pathogenic fungi and bacteria and the data show good activity of these complexes.