Iridium(III) sulfide is the

inorganic compound In chemistry, an inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds, that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as '' inorganic chemist ...

with the formula Ir₂S₃. It is an insoluble black solid, prepared by heating a mixture of elemental iridium and sulfur. Crystals can be grown by

chemical vapor transport In chemistry, a chemical transport reaction describes a process for purification and crystallization of non- volatile solids. The process is also responsible for certain aspects of mineral growth from the effluent of volcanoes. The technique is ...

using bromine as the transporting agent. The structure consists of octahedral and tetrahedral Ir and S centers, respectively. No close Ir-Ir contacts are observed. Rh₂S₃ and Rh₂Se₃ adopt the same structure.

References

{{Sulfides Sesquisulfides Iridium compounds