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Sodium pertechnetate
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Sodium pertechnetate is the inorganic compound with the formula NaTcO4. This colourless salt consists of the anion ()−. The radioactive 99mTcO4− anion is an important radiopharmaceutical for diagnostic use. The advantages to 99mTc include its short half-life of 6 hours and the low radiation exposure to the patient, which allow a patient to be injected with activities of more than 30 millicuries. Na() is a precursor to a variety of derivatives that are used to image different parts of the body.
==Chemistry==
()− is the starting material for most of the chemistry of technetium. Pertechnetate salts are usually colorless.〔Wells, A. F.; Structural Inorganic Chemistry; Clarendon Press: Oxford, Great Britain; 1984; p. 1050.〕 ()− is produced by oxidizing technetium with nitric acid or with hydrogen peroxide. The pertechnetate anion is similar to the permanganate anion but is a weaker oxidizing agent. It is tetrahedral and diamagnetic. The standard electrode potential for TcO4−/TcO2 is only +0.738 V in acidic solution, as compared to +1.695 V for MnO4−/MnO2.〔 Because of its diminished oxidizing power, ()− is stable in alkaline solution. ()− is more similar to ReO4−. Depending of the reducing agent, ()− can be converted to derivatives containing Tc(VI), Tc(V), and Tc(IV).〔''Encyclopædia Britannica: Technetium''〕 In the absence of strong complexing ligands, TcO4− is reduced to a +4 oxidation state via the formation of TcO2 hydrate.〔
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