Boron sulfides
In chemistry, boron sulfides refer to a large family of compounds characterized by boron-sulfur bonds. These compounds are colorless solids prone to hydrolysis, a process that reflects their tendency to form boron oxides. In terms of structure, boron typically exhibits an oxidation state of +3, while sulfur exhibits an oxidation state of -2. Sulfide is typically two-coordinate and boron is three coordinate.
Binary boron sulfides
The parent boron sulfide is. According to X-ray crystallography, this material is polymeric, with 3-coordinate B and 2-coordinate S. It features both four- and six-membered rings. Two sulfur-rich phases are also known, polymeric and molecular. The latter two feature some S-S bonds.
From a structural perspective, the simplest members are derivatives of trigonal planar, exemplified by. Other motifs include the following anions: and, which also exist as alkali metal salts.