Hydrogen selenide

  • Hydrogen selenide
  • Dihydrogenselenid
  • Selan

Colorless gas with a pungent odor

Gaseous

  • 3.66 g · l-1 (0 ° C, 1013 hPa)
  • 1.97 g · cm -3 (liquid, the boiling point )

-66 ° C

-41 ° C (decomposition above 150 ° C)

0.91 MPa at 20 ° C.

Poorly in water ( 9.8 g · l -1)

1,412 ( 16.85 ° C)

0.015 ml · m-3

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Hydrogen selenide, also mono Elan, is a combination of selenium and hydrogen. It was obtained by dissolving salt-like selenides in dilute acids. Hydrogen selenide is a colorless, extremely poisonous gas with unpleasant foul odor. Already one-time inhalation of small quantities leads to unpleasant, long -lasting irritation of the mucous membranes (so-called " selenium colds "). Hydrogen selenide is more toxic than hydrogen sulfide. In laboratory experiments, in which only very small amounts of hydrogen selenide arise necessarily need to work under a hood and a gas-tight protective clothing be worn.

Hydrogen selenide is used in the semiconductor and electronics industry for doping of semiconductors.

Physical Properties

Hydrogen selenide is angled built ( bond angle 91 ° ), the bond length of Se -H is 146 pm.

Production

For pure hydrogen selenide leads in the laboratory dissolution of dry aluminum selenide in water, or a reaction of the elements at 400 ° C:

CAS registry number PubChem Vapor pressure Dangerous Substances Directive (67/548/EEC) Aluminium selenide Digital Object Identifier
240141
de