科研之友
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摘要
Polyoxometalates (POMs) have shown a great potential of antitumor and antiviral activities; take into account, in this work we investigated the stability of a series of heteropolyoxotungstate-amino acids, heteropolyoxomolybdate-amino acids and the corresponding 12-heteropoly acids at different experimental conditions such as pH, buffer concentration, and the type of counter ion using UV-vis spectroscopy. Furthermore, the effect of tyrosine and ornithine were investigated as a counter ion, on the stability of POMs. The results indicated that degradation of these POMs in aqueous solutions follows pseudo-first order reaction kinetics according to the order of H4SiW12O40 > H3PW12O40 > H4SiMo12O40 > H3PMo12O40 for stability with respect to increasing of pH. The stability of POM increases in the presence of these amino acids.
- 出版日期2012-10
