Lanthanide and technetium-99 substituted polyoxometalates: Speciation studies and applications

INOR 6

Lynn C. Francesconi, lfrances@hunter.cuny.edu1, Robertha C. Howell, rhowell@hunter.cuny.edu1, Benjamin P. Burton-Pye1, Israel M. Mbomekalle1, Jing Jing, jjing@hunter.cuny.edu1, Donna McGregor, donnamcgr@msn.com1, M. R. Antonio, mantonio@anl.gov2, Wayne W. Lukens Jr., wwlukens@lbl.gov3, and Josep M. Poblet, josepmaria.poblet@urv.cat4. (1) Department of Chemistry, Hunter College and the Graduate Center of the City University of New York, 695 Park Avenue, New York, NY 10021, (2) Chemistry Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439-4831, (3) Actinide Chemistry Group, Chemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, MS 70A-1150, Berkeley, CA 94720, (4) Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel.lí Domingo s/n, Tarragona, 43007, Spain
Polyoxometalates (POMs) are vehicles to examine the speciation of the lanthanide elements and Technetium-99 under aqueous and organic conditions. Lanthanide POMs exhibit unique luminescence and electrochemical properties that are enhanced in organic solution. Luminescence titrations of 1:1 Ln: POM species in organic solution reveal formation of ternary complexes with sensitizing heterocyclic amine ligands. The 1:1 Ln: POM species in organic solution reveal rich electrochemistry. In the case of technetium, POMs can reveal molecular details of the coordination environment of a metal oxide defect necessary to provide stability to low valent Tc. Moreover, reduced polyoxometalates (by electrolysis, photochemically or by radioloysis) can reduce Tc-99 to lower valent states, thus providing a potentially cost-effective strategy that can be added to separation and reduction processes that are envisioned for closing the nuclear fuel cycle.
 

Polyoxometalates and Related Clusters in Chemistry and Nanoscience
9:00 AM-12:30 PM, Sunday, August 19, 2007 BCEC -- 204 A/B, Oral

Division of Inorganic Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007