In Search of a Sensitive Tc Sensor -- Design, Synthesis and Exploring of non-pertechnetate forms of Technetium
EMSL Project ID
47924
Abstract
The main objectives of this project is prepare a series of brand new type of technetium complexes with carbonyl and a third ligand based on the non-pertechnetae species found in Hanford tank wastes and to investigate their luminescence and other photophysical properties. The form of the non-pertechnetate Tc complex has been documented to be the [Tc(CO)3(H2O)3]+ or ligand substituted complex [Tc(CO)3(X)(H2O)m]+ (where X is a multidentate ligand, such as glycolate, citrate, or oxalate, m = 1-3, depending on the denticity of ligand X). While the [Tc(CO)3(H2O)3]+ and related complexes are not readily detected optically, we propose to convert [Tc(CO)3(H2O)3]+ into a fluorescent complex that would be readily detected at the concentrations found in tank waste. We propose to convert the [Tc(CO)3(H2O)3]+ complex into the optically emissive complexes with the formula [Tc(CO)3(L?L)2]+, where bi-dentate ligands (L?L) include: dtbbpy, dmbpy, dmebpy, bpy, and dcbbpy (bpy= 2, 2'-bipyridine, dmbpy = 4, 4'-dimethyl-2, 2'-bipyridine, dbbpy = 4, 4'-di-tert-butyl-2, 2'-bipyridine, dmeobpy = 4, 4'-dimethoxy-2, 2'-bipyridine, dcbpy = 4, 4'-dicarbomethoxy-2, 2'-bipyridine). In this project, through carefully designed synthesis, we will develop new optically emissive technetium complexes which will further enable the building of a prototype sensor for non-pertechnetate forms of Tc within the Hanford tank waste and associated contaminated groundwater. The associated fluorescent properties will allow the demonstration of the sensitivity and detection limits required for measurement of these non-pertechnetate technetium species within Hanford tank and contaminated ground water conditions.
Project Details
Project type
Large-Scale EMSL Research
Start Date
2013-10-01
End Date
2014-09-30
Status
Closed
Released Data Link
Team
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