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Five new dioxomolybdenum(VI) complexes of the general formula[MoO2(Rdtc)2],  1-5, where Rdtc-refer to piperidine- (Pipdtc), 4-morpholine-(Morphdtc),  4-thiomorpholine-(Timdtc), piperazine- (Pzdtc) or Nmethylpiperazine-  (N-Mepzdtc) dithiocarbamates, respectively, have been prepared. Elemental  analysis, conductometric measurements, electronic, IR and NMR spectroscopy  have been employed to characterize them. Complexes 1-5 contain a cis-MoO2  group and are of an octahedral geometry. Two dithiocarbamato ions join as  bidentates with both the sulphur atoms to the molybdenum atom. The presence  of different heteroatom in the piperidinо moiety influences the v(C----N) and  v(C----S) vibrations, which decrease in the order of the complexes with:  Pipdtc > N-Mepipdtc > Morphdtc > Pzdtc > Timdtc ligands. On the basis of  spectral data, molecular structures of complexes 1-5 were optimized on  semiempirical molecular-orbital level, and the geometries, as obtained from  calculations, described. Antimicrobial activity was tested against nine  different laboratory control strains of bacteria and two strains of yeast  Candida albicans. All tested strains were sensitive. Complexes bearing  heteroatom in position 4 of piperidine moiety are significantly more potent  against bacteria tested comparing to corresponding ligands

Spectroscopic properties and antimicrobial activity of dioxomolybdenum(VI) complexes with heterocyclic S,S’-ligands