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New peroxo complexes of molybdenum (VI) and uranium (IV) have been prepared. The complexes were characterized on the basis of elemental analyses, conductivity measurements, magnetic measurements, infrared spectral studies and by reactions with allyl alcohol, triphenylphosphine and triphenylarsine. The complexes of U (VI) showed strong activity against both the gram positive and gram negative bacteria than the other complexes indicating the higher zone of inhibition. The present findings of MIC experiment showed that the complex 3 of U (VI) was more potent against all the bacteria tested than the other complex. Results showed that the complex 2 of Mo (VI) exhibits more toxic to brine shrimp compared to other complexes of Mo (VI) and U (VI) indicating the lower values of LC 50 and LC 99 for both the exposure 16h and 36h.

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-1 , indicating that the dioxygen moieties are bonded on "side-on" fashion with the U(VI). The magnetic moment values indicated that these complexes were diamagnetic in nature suggesting no changes in the oxidation states of the metal ions upon complexation. These data also consistent with eight fold coordination of U(VI). The electronic spectral data of the complexes showed bands in between 315-380 nm due to the charge transfer band only.