INOR 689 |
| Polyoxometalates have unique and highly tunable electron transfer properties that have been increasingly utilized to reduce ions to their metallic form. In this work the compound [AlW12O40]5-, electrochemically or photo-reduced, had been used to reduce TcO4- to its lower valence state as TcO2 or Tc. The aim is to develop strategies which could lead to the stabilization and immobilization of technetium-99 in its lower valence states. It's 2 x 105 year half-life renders 99Tc (ƒ"max: 250 keV) an important management issue. Controlling the extensive redox chemistry is one of the obstacles in identifying and developing a wasteform for Tc. The addition of few drops of a solution of TcO4- produced a change of color from the characteristic gray black color to orange. Cyclic voltammetry and UV-visible spectroscopy confirmed the presence of free metallic or metal oxide particles. No deposition of solid material was observed in this solution after several weeks of standing, proof that the particle size remained in the nanometer range due to stabilizing effect of the POM.
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Polyoxometalates and Related Clusters in Chemistry and Nanoscience
7:00 PM-10:00 PM, Tuesday, August 21, 2007 BCEC -- Exhibit Hall - B2, Poster
Division of Inorganic Chemistry |
