Tellurium hydrogen

Structural formula
General
Surname	Tellurium hydrogen
other names	Monotellan
Molecular formula	H 2 Te
Brief description	colorless gas with a pungent odor
External identifiers / databases
EC number	231-981-5
ECHA InfoCard	100,029,073
PubChem	21765
Wikidata	Q411266
properties
Molar mass	129.62 g mol −1
Physical state	gaseous
density	5.76 kg m −3 (0 ° C)
Melting point	−49 ° C
boiling point	−1.25 ° C
safety instructions
H and P phrases	H: 220-280-330
	P: 403-405
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Tellurium hydrogen , also known as monotellan , is a chemical compound of tellurium and hydrogen and is a very toxic, easily condensable gas .

Extraction and presentation

It is produced by electrolytic reduction of tellurium at the cathode in 50% sulfuric acid or by protolysis of salt-like tellurides in acids , such as the reaction of aluminum telluride with hydrochloric acid :

${\ displaystyle \ mathrm {Al_ {2} Te_ {3} +6 \ HCl \ rightarrow 3 \ H_ {2} Te + 2 \ AlCl_ {3}}}$

properties

Tellurium hydrogen has an unpleasant garlic-like odor like arsine . The gas is easily soluble in water, decomposes in the air and burns with a bluish flame to tellurium dioxide and water . Hydro telluric acid , which is moderately strong and unstable due to oxidation, is formed in water . The dissociation constants pKa ₁ and pKa ₂ are 2.64 and 8.80, respectively.

Structural representation of tellurium hydrogen

Tellurium hydrogen is angled (bond angle 89.5 °), the bond length Te – H is 169 pm in each case .

Web links

Entry on tellurium hydrogen . In: P. J. Linstrom, W. G. Mallard (Eds.): NIST Chemistry WebBook, NIST Standard Reference Database Number 69 . National Institute of Standards and Technology , Gaithersburg MD

Individual evidence

↑ ^a ^b ^c ^d ^e ^f Entry on tellurium hydrogen in the GESTIS substance database of the IFA , accessed on January 9, 2019(JavaScript required) .
↑ G. Brauer (Ed.): Handbook of Preparative Inorganic Chemistry , 2nd ed., Vol. 1, Academic Press 1963, pp. 439-441.
↑ Wolfgang Legrum: Fragrances, between stink and fragrance , Vieweg + Teubner Verlag (2011) p. 74, ISBN 978-3-8348-1245-2 .
^ D'Ans-Lax, paperback for chemists and physicists, 4th edition, volume 3, Springer Verlag 1998, ISBN 3-540-60035-3 .
^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 627.

[GESTIS-1] ↑ ^a ^b ^c ^d ^e ^f Entry on tellurium hydrogen in the GESTIS substance database of the IFA , accessed on January 9, 2019(JavaScript required) .

[2] G. Brauer (Ed.): Handbook of Preparative Inorganic Chemistry , 2nd ed., Vol. 1, Academic Press 1963, pp. 439-441.

[Legrum-3] Wolfgang Legrum: Fragrances, between stink and fragrance , Vieweg + Teubner Verlag (2011) p. 74, ISBN 978-3-8348-1245-2 .

[4] D'Ans-Lax, paperback for chemists and physicists, 4th edition, volume 3, Springer Verlag 1998, ISBN 3-540-60035-3 .

[5] AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 627.