%0 Journal Article %T Potentiometric and spectroscopic studies of three new mixed inorganic–organic hybrid materials based on Preyssler and Wells–Dawson heteropolyoxometalates containing proline, leucine, and asparagine %A B. Chahkandi %A Mirzaei Shahrabi, Masoud %A M. Chahkandi %A A. Shokrollahi %A F. Zarghampour %A M. Shamsipur %J Journal of the Iranian Chemical Society %@ 1735-207X %D 2014