Abstract
THE chemistry of technetium, the middle member of the Group VII triad with manganese and rhenium as its congeners, has been little investigated until recently owing to its rarity. Indeed, since the isolation of the isotope technetium-99 in gram quantities from the products of uranium fission1 the oxidation states +7 and +4 only have been definitely established for this element, at least in solid compounds. These are exemplified by KTcO4 and Tc2S7 in the first case and TcO2, TcS2, TcCl4 and K2TcHal6 (Hal = Cl, Br and I) in the second1. Evidence2 for the existence of green tervalent technetium in solution has been adduced from the reducing power of an electrolytically produced aqueous solution, but no compound of technetium III was isolated. Similarly, technetium V probably exists in solution as the complex thiocyanate, but no solid compound has been isolated3. The close similarity of rhenium and technetium suggested that for the preparation of lower oxidation states of technetium a study of the corresponding rhenium chemistry would be very helpful.
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References
Boyd, J. Chem. Educ., 3, 36 (1959). This paper gives full references to the chemistry of technetium and its compounds.
Thomason, Oak Ridge Report ORNL 2453, 7 (1958). See also ref. 1.
Crouthamel, Anal. Chem., 29, 1756 (1957).
Curtis, Fergusson and Nyholm, Chem. and Indust., 625 (1958). Also Fergusson and Nyholm, ibid., 1555 (1958).
Kotani, J. Phys. Soc. Japan, 4, 293 (1949).
Nelson, Boyd and Smith, J. Amer. Chem. Soc., 76, 348 (1954); 74, 556 (1954). Dalziel, Gill, Nyholm and Peacock, J. Chem. Soc., 4012 (1958).
Nyholm and Sutton, J. Chem. Soc., 564 (1958).
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FERGUSSON, J., NYHOLM, R. New Oxidation States of Technetium. Nature 183, 1039–1040 (1959). https://doi.org/10.1038/1831039a0
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DOI: https://doi.org/10.1038/1831039a0
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