Hydrogen selenide

Hydrogen selenide

Selenourea reaction involving hydrogen selenide.

Hydrogen selenide (H_Se) is a chemical compound and a hydride of selenium. It is a colorless, flammable gas under standard conditions and is known for its foul odor, reminiscent of decayed horseradish. Hydrogen selenide is highly toxic and poses significant health risks upon exposure.

Structure and properties

Hydrogen selenide is a diatomic molecule with a bent molecular geometry. The bond angle in H_Se is approximately 91 degrees, which is slightly less than the bond angle in water (H_O) due to the larger size of the selenium atom compared to oxygen.

The compound is a weak acid, dissociating in water to form hydroselenide ions (HSe_) and protons (H_). Its acidity is greater than that of hydrogen sulfide (H_S) but less than that of hydrogen telluride (H_Te).

Production

Hydrogen selenide can be produced by the reaction of selenium with hydrogen gas at elevated temperatures. It can also be generated by the reaction of selenium dioxide (SeO_) with hydrochloric acid (HCl) in the presence of a reducing agent.

Uses

Hydrogen selenide is primarily used in the semiconductor industry for the preparation of metal selenide films. These films are used in various electronic and photovoltaic applications. The compound is also used in the synthesis of other selenium-containing compounds.

Safety

Due to its high toxicity, hydrogen selenide must be handled with extreme care. Exposure to the gas can cause irritation of the respiratory tract, and prolonged exposure can lead to more severe health effects, including damage to the central nervous system. Proper ventilation and protective equipment are essential when working with this compound.

Related pages

• Selenium
• Hydrogen sulfide
• Hydrogen telluride
• Semiconductor