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fac (S)-[Ir(aet) 3 ] (aet=2-aminoethanethiolate) is N3S3 metalloligand, which forms S-bridged polynuclear complexes with transition metal ions. A complex analogous to [Re{Ir(aet 3 )} 2 ] 3+  was formed by the reaction of  99m TcO 4 Na and   fac (S)-[Ir(aet) 3 ] in the presence of SnCl 2 2H 2 O. A simple method for radiollabelling of   fac (S)-[Ir(aet) 3 ] with  99m Tc was developed with radiolabelling efficiency higher than 99%. Effects of SnCl 2 ·2H 2 O concentration, time and pH on the radiolabelling efficiency were determined and compared with  99m Tc-[Rh(aet) 3 ].  99m Tc-[Ir(aet) 3 ] was also characterized by electrophoresis, HPLC, biodistribution studies in rats and scintigraphy in rabbit. Higher uptake by kidneys showed rapid distribution of the labelled   fac  (S)-[Ir(aet) 3 ]. Scintigrams show that liver, bladder and skeletal uptake were significant. The results of biodistribution showed that  99m Tc-[Ir(aet) 3 ] uptake is quite rapid as compared to  99m Tc-[Rh(aet) 3 ].

Comparative studies of S-bridged complexes of 99m Tc with fac (S)-[M(aet) 3 ] (M=Rh III , Ir III ; aet=2-aminoethanethiolate)