Article ID Journal Published Year Pages File Type
1307092 Inorganica Chimica Acta 2013 5 Pages PDF
Abstract

The synthesis and characterization of the new NSN tridentate bifunctional chelating agent 3-[2-(2′-pyridin-2-yl-ethylsulfanyl)ethylamino] propionic acid (as its hydrochloric salt, 1) and of its corresponding rhenium complex fac-[Re(NSN)(CO)3]+, 2, is described. Both compounds were characterized by elemental analysis, IR and NMR spectroscopies and X-ray crystallography. In complex 2 the coordination geometry around rhenium is distorted octahedral with the NSN atoms participating in the coordination sphere while the carboxylate group remains free. At tracer level, the analogous complex fac-[99mTc(NSN)(CO)3]+, 3, was obtained in high yield by reacting ligand 1 with the fac-[99mTc(H2O)3(CO)3]+ precursor at pH 6.5. The structure of 3 was established by HPLC comparison to the prototype rhenium complex 2. Complex 3 is stable in solution as well as in the presence of strongly coordinating agents like histidine or cysteine. Our data indicate that ligand 1 can be used as a bifunctional NSN chelating agent in the design of potential 99mTc-radiopharmaceuticals.

Graphical abstractThe synthesis and characterization of a new bifunctional NSN tridentate ligand and its corresponding rhenium and technetium-99 complexes with the fac-[M(CO)3]+ core is described..Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A new bifunctional NSN tridentate ligand has been prepared. ► Its complexes with the fac-[M(CO)3]+ core (M = Re and 99mTc) have been synthesized and characterized. ► The 99mTc complex is stable against His and Cys challenge.

Related Topics
Physical Sciences and Engineering Chemistry Inorganic Chemistry
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