Pertechnetic acid

Pertechnetic acid (HTcO4) is a compound of technetium that is produced by reacting technetium(VII) oxide (Tc2O7) with water or strong oxidizing acids, such as nitric acid, concentrated sulfuric acid or aqua regia.[1] The dark red hygroscopic substance is a strong acid, with a pKa of 0.32,[2] as such it exists almost entirely as the pertechnetate ion in aqueous solution. The red color in solution is thought to be due to the formation of the polyoxometallate Tc20O4−68.[3]

Pertechnetic acid
Names
IUPAC name
Pertechnetic acid
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/H2O.3O.Tc/h1H2;;;;/q;;;;+1/p-1 checkY
    Key: UTQISYNNAQMRBN-UHFFFAOYSA-M checkY
  • O[Tc](=O)(=O)=O
Properties
HO4Tc
Molar mass 163 g·mol−1
Conjugate base Pertechnetate
Related compounds
Other anions
 Permanganic acid
Perrhenic acid
Other cations
 Sodium pertechnetate
Related compounds
 Perchloric acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Use of strong enough acid solution, for example, concentrated sulfuric acid, can generate the protonated form, which then exists as the octahedral TcO3(OH)(H2O)2 dihydrate complex.[4]

See also

References
  1. Schwochau, Klaus (2000). Technetium : Chemistry and radiopharmaceutical applications. Weinheim [u.a.]: Wiley-VCH. p. 127. ISBN 3-527-29496-1.
  2. Omori, T.; Asahina, K.; Suganuma, H. (1995). "Mechanism of the solvent extraction of pertechnetate with tetraphenylarsonium chloride". Journal of Radioanalytical and Nuclear Chemistry. 191 (1): 99–104. doi:10.1007/BF02035989. S2CID 97175462.
  3. German, Konstantin E.; Fedoseev, Alexander M.; Grigoriev, Mikhail S.; Kirakosyan, Gayane A.; Dumas, Thomas; Den Auwer, Christophe; Moisy, Philippe; Lawler, Keith V.; Forster, Paul M.; Poineau, Frederic (24 September 2021). "A 70‐Year‐Old Mystery in Technetium Chemistry Explained by the New Technetium Polyoxometalate [H7O3]4[Tc20O68]⋅4H2O". Chemistry – A European Journal. 27 (54): 13624–13631. doi:10.1002/chem.202102035.
  4. Poineau F, Weck PF, German K, Maruk A, Kirakosyan G, Lukens W, Rego DB, Sattelberger AP, Czerwinski KR (2010). "Speciation of heptavalent technetium in sulfuric acid: structural and spectroscopic studies" (PDF). Dalton Transactions. 39 (37): 8616–8619. doi:10.1039/C0DT00695E. PMID 20730190.
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