Technetium VII

2- bis(dimethylphosphino)ethane dimethylsulfoxide l 2-bis(diphenylphosphino)ethane dithiooxalic acid 

Fundamentals of Nuclear Pharmacy, 3rd ed. Springer-Verlag, New York, 1992. 

Steigman, J., and Eckelman, W. C., The Chemistry of Technetium in Medicine. National Academy Press, Washington, D.C., 1992. 

Colton, R., The Chemistry of Rhenium and Technetium. Interscience Publishers, London, 1965. 

Peacock, R. D., The Chemistry of Technetium and Rhenium. Elsevier, Amsterdam, 1966. 

FABMS fast atom bombardment mass spectrometry 

The cf complexes of Tc(VIl) arc efficiently stabilized by trioxo-, nitrido-, and imido-groups as strong electron donors. Tn particular, trisimido compounds were recently shown to be resistant even to electrochemical reduction. Nitrido- and nitrido-hydra-zido groups are known to occur also in structurally remarkable dinuclear complexes. Finally, the highly reactive hydridotechnetatc(Vll) has been the object of much attention. Altogether, the number of Tc(Vll) complexes is rather limited. 

---

De Luca G, P de Philip, Z Dermoun, M Rouseet, A Vermeglio (2001) Reduction of Technetium (VII) by Desulfovibrio fructosovorans is mediated by the nickel-iron hydrogenase. Appl Environ Microbiol 67 468-475. 

Ballestra et al. [32] described a radiochemical measurement for determination of "technetium in rain, river, and seawater, which involved reduction to technetium (IV), followed by iron hydroxide precipitation and oxidation to the heptavalent state. Technetium (VII) was extracted with xylene and electrode-posited in sodium hydroxide solution. The radiochemical yield was determined by gamma counting on an anticoincidence shield GM-gas flow counter. The radiochemical yield of 50 to 150 litre water samples was 20-60%. 

Technetium (VII) is adjusted to 3.5 to 4.0 M sulfuric acid solution. Hydrochloric, nitric and other volatile acids may be volatilized below 100 °C without loss of technetium (VII). The volume of the reduction medium is limited to 4.0 ml and that of cone, sulfuric acid to less than 1 ml to prevent possible phase separation of the final acetone solution. Then 4.0 M aqueous ammonium thiocyanate (0.5 ml) is added to the 3.5 to 4.0 M sulfuric acid solution of technetium (VII). 

This amount of thiocyanate is sufficient for both complete reduction and complex formation. Reduction is allowed to proceed for 30 to 45 s after the addition of the thiocyanate. A bright red color can readily be observed at a technetium (VII) concentration of 0.1 ng per ml. Acetone (6 ml) is then added and the volume of the solution mixed and adjusted to 10 ml with distilled water. At this point, the color has generally developed to less than 50% of its final intensity. Quartz 1-cm glass-stoppered cells are filled with the technetiiun solution and placed in a 20 °C water-cooled spectrophotometer. The extinction will approach a maximum intensity in 1 to 3 h. The maximiun extinction occurs at 510 nm with a molar extinction coefficient and standard deviation of 47,500 + 500 in 60 vol. % of the acetone-aqueous medium. An additional examination of the analysis may be carried out by extract-... 

Technetium(VII) oxide is a yellow solid, crystallizing in the orthorhombic space group D2)l15-Pbca and is one of the few known transition metal oxides having a molecular structure in the solid state.10 It melts at 119.5° and boils at 310.6° It dissolves in water, forming pertechnetic acid. The pertechnetate ion is known to inhibit the corrosion of steel. TechnetiumfVII) oxide is an excellent starting material for preparing pure technetium metal. 

Byegard J., Albinsson Y., Skamemark G., and Skalberg M. (1992) Field and laboratory studies of the reduction and sorption of technetium(VII). Radiochim. Acta 58/59, 239-244. 

Chiarizia, R., Application of supported liquid membranes for removal of nitrate, technetium (VII) and chromium (VI) from ground-water. J. Membr. Sci., 1991, 55 39-64. 

Transition metal peroxo complexes are stoichiometric or catalytic oxidants of organic compounds. Many of them have been structurally characterized Synthesis of several new technetium(VII) nitridoperoxo complexes has been reported recently ... 

---