1141. New compounds in which technetium has a low valency

The Chemistry of Technetium–Water Complexes within the Manganese Triad: Challenges and Perspectives

“…[17] For labelling purposes (in contrast to catalysis), coordinated water has to exchange irreversibly for a ligand group that is attached via a spacer to a biomolecule. Probably one of the first structurally characterized [18] technetium complexes comprising a water ligand was the so-called pink [19] This complex, for which the ruthenium as well as the osmium analogues exist, was reversibly oxidized at +0. 8 2+ formed, a behaviour that is unprecedented and did (and still does) not have parallels among the nitrido complexes of the neighbouring transition elements (Scheme 2).…”

Nitrosylation of Hexafluoridotechnetate(IV)

“…The formation of a nitrosyl/ammine complex under such condition might be unusual for the first glance, but is not without precedence. A carefull reinspection of the spectroscopic data and the determination of an single‐crystal X‐ray structure similar to that of “Eakin's pink complex”, which has 1963 originally been reported as a hydroxylamine compound,5 identified this complex as [Tc(NO)(NH 3 ) 4 (H 2 O)]Cl 2 14…”

Technetium

“…Pertechnetic acid is a strong acid and may be titrated with the aid of indicators such as methyl red. There is evidence for the Tc(III) state besides that provided by the Polarographie work, both from the reduction of the TcClo 2ion 92 and from the controlled potential electrolysis of pertechnetate solution at pH 7 in a phosphate buffer 93 . In general the solubilities of the pertechnetates seem to be somewhat higher than those of the corresponding perrhenates.…”