Abstract
Three distinct cationic complexes of technetium, containing Tc(V), Tc(III), and Tc(I) centers, have been prepared by reduction of pertechnetate with bis(1,2-dimethylphosphino)ethane (DMPE). Careful control of reaction conditions allows the synthesis of any one of three trans-complexes in greater than 90% yield. All complexes have been characterized by visible-, uv-, and ir-spectrophotometry, elemental analyses, and high-performance liquid chromatography. The Tc(I) complex has been additionally characterized by /sup 31/P and /sup 99/Tc NMR, as well as a new type of extended x-ray absorption fine structure analysis (EXAFS), which show that this is an octahedral species with a Tc-P bond length of 2.40A. The Tc(V) and Tc(III) complexes have been additionally characterized by single-crystal x-ray analyses.
Published Version
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