SREL Reprint #1940
EXAFS studies of CsBr-dibenzo-18-crown-6 ether solutions
K.M. Kemnera, W.T. Elama, D.B. Hunterb, P.M. Bertsch b
aUS Naval Research Laboratory, Code 6684, Washington, DC 20375-5345, USA
bDivision of Biogeochemistry, Savannah River Ecology Laboratory, University of
Georgia, Aiken, SC 29802, USA
Abstract
An understanding of the structural binding properties of 137Cs with ligands is
paramount in designing chelates for waste treatment and isolation applications as
well as for understanding sorption mechanisms to natural organic and inorganic
colloids. We have investigated Cs bonding environments in crown ether
complexes by employing 137Cs as a probe for XAFS studies. Crown ethers
represent a good first choice for XAFS structural studies because they have
well-defined first and second shell environments. Additionally, the oxygen
functional groups and bond distances can be easily manipulated by choice of
specific crown ether molecules. The ability of XAFS to elucidate the structural
environment of Cs within the crown ether complex will be useful in additional
investigations in which the Cs is selectively bound within a cage of electronegative
oxygen donors including humic and other organic substances, colloidal clay
minerals and ion selective exchange resins used to treat nuclear wastes.
SREL Reprint #1940
Kemner, K.M., W.T. Elam, D.B. Hunter, and P.M. Bertsch. 1995. EXAFS studies of CsBr-dibenzo-18-crown-6 ether solutions. Physica B 208/209:735-736.
