Technetium mononuclear 3+ complexes

Non-ionic thiourea derivatives have been used as ligands for metal complexes [63,64] as well as anionic thioureas and, in both cases, coordination in metal clusters has also been described [65,66]. Examples of mononuclear complexes of simple alkyl- or aryl-substituted thiourea monoanions, containing N,S-chelating ligands (Scheme 11), have been reported for rhodium(III) [67,68], iridium and many other transition metals, such as chromium(III), technetium(III), rhenium(V), aluminium, ruthenium, osmium, platinum [69] and palladium [70]. Many complexes with N,S-chelating monothioureas were prepared with two triphenylphosphines as substituents. 

Yokoyama A, Horiuchi K, Hata N et al (1979) Technetium in technetium-99m radiopharmaceuticals. I. Tetravalent mononuclear technetium penicillamine complex. J Labeled Compd Radio-pharm 16 80-81... 

No technetium complexes of sulfoxides have been reported. Mononuclear rhenium(V) complexes of the types [Re02Cl(Me2S0)] (246) and... 

The synthesis of pentacarbonyl rhenium(I) halides, Re(CO)5X, succeeded from simple and complex rhenium halides below 200 atm of CO at 200° C. The compounds are extraordinarily stable and form easily, often quantitatively, from carbon monoxide and rhenium metal in the presence of other heavy metal halides or halogen sources such as CC14. Later we prepared the corresponding carbonyl halides of manganese (67) and technetium (68) from their respective carbonyls. It was found that the corresponding binuclear tetracarbonyl halides [M(CO)4X]2 (M = Mn, Re) could be made by heating the mononuclear M(CO)5X complexes (15, 69), as well as by other methods. 

The yellowish complexes are non-electrolytes and easily soluble in benzene and chloroform. Mononuclear, brown N,N-dialkyldithiocarbamides of technetium were obtained by reacting Tc(C()).sCI " with sodium N,N-diallcyldithiocarbamides ... 

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