Silicon sulfide,13759-10-9

Appearance: White needle-like or fibrous crystals, sometimes gray or brown; emits an odor resembling rotten eggs in moist air (due to the formation of H₂S)

Density: 1.853 g/cm³ (some sources cite 2.02 g/cm³, likely due to differences in crystal form)

Melting point / Sublimation point: Approx. 1090 °C (sublimes upon heating)

Solubility:

Structure: Orthorhombic crystal system; chain-like structure composed of edge-sharing SiS₄ tetrahedra

Stability:

Sensitive to moisture; decomposes in moist air

Flammable (burns in the presence of an open flame)

🔬 Chemical Uses

Applications of silicon sulfide primarily lie in the fields of inorganic materials chemistry, silicon-sulfur chemistry, and the preparation of thiosilicates:

1. Preparation of Thiosilicates
SiS₂ reacts with sulfides such as Na₂S, MgS, and Al₂S₃ to form various thiosilicates; it serves as a key precursor in inorganic sulfide chemistry.

2. Precursor for Silane Compounds
Undergoes alcoholysis reactions with alcohols (e.g., ethanol, tert-butanol) to produce silicon alkoxides or sulfur-containing silanes, such as:

Tetraethoxysilane (TEOS)

Tri-tert-butoxy-silanethiol

These products have application value in sol-gel materials, silicon oxide thin films, and functional silicon materials.