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  • 1 Babes-Bolyai' University Department of Chemistry 3400 Cluj-Napoca Romania 3400 Cluj-Napoca Romania
  • 2 University of Oradea Faculty of Science 3700 Oradea Romania 3700 Oradea Romania
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An improved method for the synthesis of four heterotrinuclearpolyacids of the type: Hx[EM′yM″zO40nH2O (E=P, Si; M′=Mo, W; M″=V, W) was elaborated. The studied compounds were characterized by elemental analysis, IR spectra and thermal behaviour over 20–800C temperature range.