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The complexation reactions of the  99m Tc(I)-(CO) 3 (OH 2 ) 3  +  precursor with tris-hydroxymethylenephosphine (THP) and a diphosphine ligand analogue (HMPE) were studied at tracer levels. Results demonstrate rapid formation of  99m Tc(I)(CO) 3  +  complexes with both THP and HMPE. In the presence of excess THP, conversion of initial complexes to stable, well-defined  99m Tc species occurs indicating coordination of phosphine groups to Tc(I) at all three sites  trans  to the carbonyl ligands.

radiochimica acta

Characterization of complexation reactions of mono- and bidentate-hydroxymethyl phosphine ligands with the organometallic  99m Tc(I)(OH 2 ) 3 (CO) 3  +  synthon