Abstract
AbstractThe novel tetradentate N3O bifunctional agent 3‐hydroxy‐4‐[2‐(2′‐pyridinecarboxamido)acetylamino]benzoic acid (1), reacts with [Bu4N][ReOCl4] or [Bu4N][99gTcOCl4] in EtOH resulting in neutral and stable oxorhenium 2 or oxotechnetium‐99 g 3 complexes. Both complexes were characterized by elemental analysis, IR, 1H and 13C NMR spectroscopy. X‐ray analysis of 2 showed that the rhenium atom is pentacoordinate presenting a distorted square‐pyramidal coordination geometry. The analogous oxotechnetium‐99m complex 4 was also prepared quantitatively by the reaction of ligand 1 with Na99mTcO4 in isotonic saline using tin chloride as reducing agent. Its identity was established by chromatographic comparison to the oxorhenium 2 and oxotechnetium 3 complexes. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)
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