Tl2S3

Tl2S3, or thallium(III) sulfide, is a binary inorganic compound composed of thallium and sulfur with the formula Tl2S3. In this compound, thallium is in the +3 oxidation state, balanced by sulfide anions. Tl2S3 is one of several thallium sulfides and is primarily of interest in solid-state chemistry and materials science as a member of the thallium chalcogenides family.

Preparation and occurrence of Tl2S3 are mainly described in laboratory and research contexts. It can be prepared by heating a mixture of Tl2S with elemental sulfur at elevated temperature, or by sulfidation of thallium(III) salts under suitable conditions. It typically forms as a dark crystalline solid and has been studied for its electronic and optical properties as a wide-bandgap sulfide.

Properties of Tl2S3 include limited solubility in water and notable semiconducting behavior. Like many sulfides, it can react with acids to release hydrogen sulfide gas. The material is relatively fragile and sensitive to processing conditions, with its structural form and properties influenced by temperature and synthesis methods.

Safety and handling considerations are important because thallium compounds are highly toxic. Tl2S3 should be handled with appropriate safety precautions, and waste should be managed according to hazardous-materials guidelines to prevent environmental and health risks.

See also: Tl2S and Tl2O3.