Ammonium pertechnetate

Crystal structure
__ N 3−      __ H +      __ Tc 7+      __ O 2−
Crystal system	tetragonal
Space group	I 4 1 / a (No. 88)
Lattice parameters	a = 577.5  pm c = 1325.2 pm
General
Surname	Ammonium pertechnetate
Ratio formula	NH 4 TcO 4
Brief description	white solid
External identifiers / databases
CAS number 34035-97-7 PubChem 9577286 ChemSpider 7851725 Wikidata Q19903287
properties
Molar mass	179.94 g mol −1
Physical state	firmly
Melting point	disintegrates at 325 ° C
solubility	soluble in water
Hazard and safety information
Radioactive
GHS hazard labeling no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Ammoniumpertechnetat , NH ₄ TcO ₄ is the ammonium - salt of pertechnetic acid HTCO ₄ .

properties

Physical properties

The salt crystallizes in a tetragonal crystal structure with the space group I 4 ₁ / a (space group no. 88) and the lattice parameters a = 577.5  pm and c = 1325.2 pm at 25 ° C.

Chemical properties

Ammonium pertechnetate easily dissolves in anhydrous hydrogen fluoride . The reaction product is pertechnetyl fluoride TcO ₃ F.

The reduction of ammonium pertechnetate with hydrogen can produce metallic technetium . The reduction only takes place at 600 ° C, at lower temperatures technetium (IV) oxide is formed .

${\displaystyle {\ce {NH4TcO4 + 2 H2 -> Tc + 4 H2O + 1/2 N2}}}$

Individual evidence

1. ^ ^{A b} Edward Anders: The Radiochemistry of Technetium . 3021st edition. National Academies, 1960, pp. 4 .
2. ↑ Klaus Schwochau: Technetium: Chemistry and Radiopharmaceutical Applications . John Wiley & Sons, 2008, ISBN 3-527-61337-4 , pp. 129 .
3. ↑ The hazards emanating from radioactivity do not belong to the properties to be classified according to the GHS labeling. With regard to other hazards, this substance has either not yet been classified or a reliable and citable source has not yet been found.
4. ↑ R. Faggiani, RJ Gillespie, CJL Lock, J. Pocé: The structure of ammonium pertechnetate at 295, 208 and 141 K . 1980, p. 231-233 , doi : 10.1107 / S0567740880002993 .
5. ↑ J. Binenboym, U. El-Gad, H. Selig: Reaction of ammonium pertechnetate with anhydrous hydrogen fluoride. Vibrational spectra of pertechnetyl fluoride . Inorg. Chem., February 1974, pp. 319-321 , doi : 10.1021 / ic50132a015 .
6. ↑ Klaus Schwochau: Technetium: Chemistry and Radiopharmaceutical Applications . John Wiley & Sons, 2008, ISBN 3-527-61337-4 , pp. 94 .