Ispitivanje stabilnosti 12-volframfosforne, 12-volframsilicijumove i 12-molibdenfosforne kiseline u vodenim rastvorima

摘要

In this paper, stability of aqueous solutions of three heteropoly acids (HPAs) is investigated by UV/VIS, IR and NMR spectroscopy. The results have shown that in aqueous solutions of WSiA, Keggin structure is preserved in the widest pH range, from pH = 1 to pH = 7, while in the case of WPA and MoPA, this structure is present only at pH = 1. Under the phsyhiological conditions, WSiA is in the form of Keggin-anion, WPA in the shape of lacunary Keggin-anion, while the structure of MoPA is completely distroyed, which is of importance for biomedical applications of these compounds.%U ovom radu je ispitivana stabilnost vodenih rastvora tri heteropolikiseline(HPK) korišćenjem UV/VID, IC i NMR spektroskopije. Rezultati su pokazali da je kod vodenog rastvora WSiA, Keggin-ova struktura očuvana u najširoj oblasti pH vrednosti, od pH=1 do 7, a da je kod WPA i MoPA, ovaj oblik prisutan samo na pH=1. Pri fiziološkim uslovima WSiA se nalazi u obliku Keggin-ovog anjona, WPA u obliku lakunarnog Keggin-ovog anjona,a struktura MoPA je potpuno razorena, što je od značaja za biomedicinsku primenu ovih jedinjenja.