Chemistry: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.[1]
Binary boron sulfides
Structure of one form of BS2
The parent boron sulfide is B
2S
3. 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 (BS
2)
n and molecular (BS
2)
8. The latter two feature some S-S bonds.
Tertiary phases
From a structural perspective, the simplest members are derivatives of trigonal planar [BS
3]3−, exemplified by Li
3BS
3. Other motifs include the following anions: [B
2S
4]2− and [B
3S
6]3−, which also exist as alkali metal salts.
References
- ↑ Conrad, Olaf; Jansen, Christoph; Krebs, Bernt (1998). "Boron-Sulfur and Boron-Selenium Compounds—From Unique Molecular Structural Principles to Novel Polymeric Materials". Angewandte Chemie International Edition 37 (23): 3208–3218. doi:10.1002/(SICI)1521-3773(19981217)37:23<3208::AID-ANIE3208>3.0.CO;2-5. PMID 29711432.
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