• Olha S. Panteleieva Ukrainian State University of Chemical Technology, Ukraine
  • Kateryna A. Plyasovskaya Oles Honchar Dnipro National University, Ukraine
  • Olexandr V. Shtemenko Ukrainian State University of Chemical Technology, Ukraine



polyoxometalates, 1, 3, 5-triphenyl-verdazyl radical, DPPH-radical, 7-trimethylxanthine, complex compounds, anti-radical action.


In the course of research on interaction of artificial radicals of triphenyl-verdazyl (TPV) and diphenyl picryl hydrazyl (DPPH) with complex compounds of 1,3,7-trimethylxanthine with anions of polyoxometalates of molybdenum and tungsten, an anti-radical action of the coordination compounds mentioned above was proved. During the interaction of these compounds with the TPV-radical, deactivation of the latter occurs. This is evidenced, firstly, by a decrease followed by vanishing of characteristic absorption maximum in the visible area of spectroscopy for the radical form – 720 nm and, secondly, by disappearance on і,Е-curves of maxima of TPV-radical transition into the anionic form. Unequal decrease in absorption maxima of the cationic and anionic forms of TPV can give evidence of complicated nature of the interaction of the TPV-radical with the complex (Hcaf)3[PМе12O40]×6H2O (where Ме = Мо, W). According to the spectroscopy data, compounds (Hcaf)3[PМо12O40]×6H2O showed greater anti-radical action compared to (Hcaf)3[PW 12O40]×6H2O. That is, the antiradical effect of the complex compounds (Hcaf)3[PМо12O40]×6H2O, (Hcaf)3[PW 12O40]×6H2O was proved.


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Physical and inorganic chemistry