Arsine is the chemical
compound with the
formula As
H3. This flammable,
pyrophoric, and highly toxic gas is the simplest compound of arsenic. Aside from its lethality, it finds applications in the semiconductor industry and for the synthesis of
organoarsenic compounds.At its standard state, arsine is a colorless, denser-than-air gas that is soluble in
water (200 mL/L) and in many
organic solvents as well. Whereas arsine itself is odorless, owing to its oxidation by air it is possible to smell a slight,
garlic-like scent when the compound is present at about 0.5
ppm. This compound is generally regarded as stable, since at room temperature it decomposes only slowly. At temperatures of ca. 230 °C decomposition to arsenic and hydrogen is rapid. Several factors, such as
humidity, presence of light and certain
catalysts (namely
aluminium) facilitate the rate of decomposition.
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