Pertechnetic_acid Knowpia

Pertechnetic acid
Names
	IUPAC name Pertechnetic acid
Identifiers
CAS Number	14332-45-7;
3D model (JSmol)	Interactive image;
ChemSpider	9979749 ;
PubChem CID	11805084;
	InChI InChI=1S/H2O.3O.Tc/h1H2;;;;/q;;;;+1/p-1 Key: UTQISYNNAQMRBN-UHFFFAOYSA-M ;
	SMILES O[Tc](=O)(=O)=O;
Properties
Chemical formula	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

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 pK_a 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]

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]

References edit

^ Schwochau, Klaus (2000). Technetium : Chemistry and radiopharmaceutical applications. Weinheim [u.a.]: Wiley-VCH. p. 127. ISBN 3-527-29496-1.
^ 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.
^ 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.
^ 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.

[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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Summary

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References edit