Technetium (IV) oxide

Crystal structure
	__ Tc 4+ __ O 2−
General
Surname	Technetium (IV) oxide
other names	Technetium dioxide
Ratio formula	TcO 2
Brief description	brown-black solid
External identifiers / databases
PubChem	6857437
ChemSpider	5256775
Wikidata	Q4332870
properties
Molar mass	129.91 g mol −1
Physical state	firmly
density	6.9 g cm −3
Melting point	900 ° C (sublimation)
Hazard and safety information
	; Radioactive
GHS hazard labeling ; no classification available
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 .

Technetium (IV) oxide is an inorganic chemical compound of technetium from the group of oxides .

presentation

Technetium (IV) oxide can be obtained by decomposing ammonium pertechnetate at 800 ° C.

{\ displaystyle {\ ce {2 NH4TcO4 -> 2 TcO2 + 4 H2O + N2}}}

It can also be obtained from other technetium oxides by heating in air.

The dihydrate is formed by the reaction of ammonium metal hexachloride with an ammonia solution .

{\ displaystyle {\ ce {(NH4) 2 [TcCl6] + 4 NH4OH -> TcO2. 2 H2O + 6 NH4Cl}}}

properties

Technetium (IV) oxide is a brown-black solid. It crystallizes in a distorted rutile structure of molybdenum (IV) oxide . At 900 ° C it begins to sublime and disproportionate above 1100 ° C into technetium and technetium (VII) oxide . It is oxidized to TcO ₄^- by nitric acid or hydrogen peroxide . It's weakly paramagnetic. The dihydrate changes into the anhydrous form when heated to 300 ° C in vacuo.

Individual evidence

↑ ^a ^b ^c ^d ^e ^f Georg Brauer (Ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1599.
^ ^A ^b H. Harry Julius Emeleus, AG Sharpe: Advances in Inorganic Chemistry and Radiochemistry . Academic Press, 1968, ISBN 0-08-057860-8 , pp. 21 ( limited preview in Google Book search).
↑ 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.
^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 1500.
↑ Joseph Steigman, William C. Eckelman, National Research Council (US). Committee on Nuclear and Radiochemistry: The chemistry of technetium in medicine . National Academies, 1992, pp. 57 ( limited preview in Google Book search).

[brauer-1] ↑ ^a ^b ^c ^d ^e ^f Georg Brauer (Ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1599.

[H._Harry_Julius_Emeleus,_A._G._Sharpe-2] A ^b H. Harry Julius Emeleus, AG Sharpe: Advances in Inorganic Chemistry and Radiochemistry . Academic Press, 1968, ISBN 0-08-057860-8 , pp. 21 ( limited preview in Google Book search).

[NV-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.

[Arnold_F._Holleman,_Egon_Wiberg,_Nils_Wiberg-4] AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 1500.

[Joseph_Steigman,_William_C._Eckelman,_National_Research_Council_(U.S.)._Committee_on_Nuclear_and_Radiochemistry-5] Joseph Steigman, William C. Eckelman, National Research Council (US). Committee on Nuclear and Radiochemistry: The chemistry of technetium in medicine . National Academies, 1992, pp. 57 ( limited preview in Google Book search).