Ammonium pertechnetate
{{Chembox
| IUPACName = Ammonium pertechnetate
| ImageFile = Ammonium Pertechnetate Avogadro.png
| ImageFile1 = Ammonium pertechnetate.jpg
| ImageSize1 =
| ImageAlt1 =
| ImageName1 =
| ImageCaption1 = Ammonium pertechnetate
|Section1={{Chembox Identifiers
| PubChem = 9577286
| CASNo = 34035-97-7
| ChemSpiderID = 7851725
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| SMILES = [O-][Tc](=O)(=O)=O.[NH4+]
| StdInChI = 1S/H2O.3O.Tc/h1H2;;;;/q;;;;+1/p-1
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = WJULHBIORCQBSY-PUQAOBSFSA-O
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
}}
|Section2={{Chembox Properties
| H=4 | N=1 | O=4 | Tc=1
}}
|Section3={{Chembox Related
| OtherFunction_label =
| OtherAnions = Ammonium nitrate
| OtherCations = Sodium pertechnetate
Potassium pertechnetate
Calcium pertechnetate
| OtherCompounds = Perchloric acid
| OtherFunction =
}}
}}
Ammonium pertechnetate is a chemical compound with the formula NH4TcO4. It is the ammonium salt of pertechnetic acid. The most common form uses 99Tc.{{Cite web|url=https://pubchem.ncbi.nlm.nih.gov/compound/9577286#section=Top|title = Ammonium pertechnetate[99Tc]}} The compound is readily soluble in aqueous solutions forming ammonium and pertechnetate ions.
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:{{cite book |last1=Boschke |first1=Friedrich L. |title=Inorganic Chemistry |date=31 December 1981 |publisher=Walter de Gruyter GmbH & Co KG |isbn=978-3-11-270829-3 |page=131 |url=https://books.google.com/books?id=PPQIEQAAQBAJ&dq=Technetium+heptasulfide&pg=PA131 |access-date=23 July 2024 |language=en}}{{cite web |title=CharChem. Technetium(VII) sulfide |url=http://www.easychem.org/en/subst-ref/?id=5762&langs=%2A |publisher=easychem.org |access-date=23 July 2024}}{{cite journal |last1=Poineau |first1=Frederic |last2=Burton-Pye |first2=Benjamin P. |last3=Sattelberger |first3=Alfred P. |last4=Czerwinski |first4=Kenneth R. |last5=German |first5=Konstantin E. |last6=Fattahi |first6=Massoud |title=Speciation and reactivity of heptavalent technetium in strong acids |journal=New Journal of Chemistry |date=2018 |volume=42 |issue=10 |pages=7522–7528 |doi=10.1039/c7nj04912a |url=https://istina.ipmnet.ru/publications/article/134243400/ |access-date=23 July 2024|url-access=subscription }}
::{{chem2|2NH4TcO4 + 7H2S + 2HCl → Tc2S7↓ + 2NH4Cl + 8H2O}}