Synthesis, characterization and biological activity of ternary molybdenum heteropoly salts

Among the many inorganic bacterial inhibitors available today, pol-yoxometalates (POM), green antimicrobial agents with extremely high antimicrobial efficiency, have received attention. Attributed to the advantages of POM with various types, variable structures, good magnetic properties, electrical conductivity and redox activity, the modification of a POM was chosen in this work. Four new poly-oxometalates with Keggin structures, K7Mn(H2O)NiMo11O39.8H(2)O, K7Mn(H2O)ZnMo(11)O(39.)14H(2)O, K7Cu(H2O)NiMo11O39.8H(2)O and K7Cu ((HO)-O-2)(ZnMoO39)-O-11.14H(2)O, were synthesized by the liquid-phase method using Mo as the coordination atom, Mn and Cu as the het-eroatoms and Ni and Zn as the substitution atoms. The structures of the four polyoxometalates were characterized by elemental ana-lysis (AAS), infrared (FT-IR) spectroscopy, ultraviolet-visible (UV -vis-ible) spectroscopy, thermogravimetric analysis (TG), X-ray diffraction (XRD), and scanning electron microscopy (SEM). We also analyzed the inhibition performance on four bacteria, Escherichia coli, Bacillus subtilis, Staphylococcus aureus and Bacillus cereus. Herein, we exam-ine the bacterial inhibitory effect and the inhibition rate of the POM against bacteria by four different methods of bacterial inhibition, filter paper sheet method, Oxford cup method, MIC value deter-mination and TTC test.