Ammonium pertechnetate

Ammonium pertechnetate is a chemical compound with the formula NH₄TcO₄. It is the ammonium salt of pertechnetic acid. The most common form uses ⁹⁹Tc.^[1] The compound is readily soluble in aqueous solutions forming ammonium and pertechnetate ions.

Ammonium pertechnetate

Ammonium pertechnetate
Names
IUPAC name Ammonium pertechnetate
Identifiers
CAS Number	34035-97-7
3D model (JSmol)	Interactive image
ChemSpider	7851725 Y
PubChem CID	9577286
InChI InChI=1S/H2O.3O.Tc/h1H2;;;;/q;;;;+1/p-1 Y Key: WJULHBIORCQBSY-PUQAOBSFSA-O Y
SMILES [O-][Tc](=O)(=O)=O.[NH4+]
Properties
Chemical formula	H4NO4Tc
Molar mass	180 g·mol−1
Related compounds
Other anions	Ammonium nitrate
Other cations	Sodium pertechnetate Potassium pertechnetate Calcium 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

Synthesis

It can be synthesized by the reaction of pertechnetic acid and ammonium nitrate:

HTcO₄ + NH₄NO₃ → NH₄TcO₄ + HNO₃

It thermally decomposes under inert atmosphere at 700 °C to technetium dioxide:

NH₄TcO₄ → TcO₂ + 2 H₂O + 1/2 N₂

Chemical properties

Passing hydrogen sulfide through acidic solutions of ammonium pertechnetate produces Technetium(VII) sulfide:^[2][3][4]

2NH₄TcO₄ + 7H₂S + 2HCl → Tc₂S₇↓ + 2NH₄Cl + 8H₂O