Tetraarsenic Tetrasulfide

Tetraarsenic tetrasulfide is a chemical compound with the molecular formula As4S4. It is a yellow-orange solid that is insoluble in water but soluble in organic solvents such as benzene and carbon disulfide.

Tetraarsenic tetrasulfide is primarily used in the semiconductor industry as a source material for arsenic dopant in the fabrication of electronic components. It is also used in the manufacture of pigments, glass, and ceramics.

The crystal structure of tetraarsenic tetrasulfide consists of As4S4 molecules arranged in layers parallel to the (001) plane. Each molecule has an As4 tetrahedron at its core, with four sulfur atoms bonded to each arsenic atom. The As-As bond lengths are 2.57 Å, while the As-S bond lengths are 2.15 Å.

Tetraarsenic tetrasulfide is known to be toxic and can cause skin irritation, eye irritation, and respiratory problems if inhaled. It is classified as a hazardous substance by the United States Occupational Safety and Health Administration (OSHA). Therefore, proper safety measures should be taken when handling this compound, including the use of protective clothing and respiratory equipment.