Thallium(I) oxide
Thallium oxide is the inorganic compound of thallium and oxygen with the formula Tl2O in which thallium is in its +1 oxidation state. It is black and produces a basic yellow solution of thallium hydroxide when dissolved in water. It is formed by heating solid TlOH or Tl2CO3 in the absence of air. Thallium oxide is used to make special high refractive index glass. Thallium oxide is a component of several high temperature superconductors. Thallium oxide reacts with acids to make thallium salts.
Tl2O adopts the anti-cadmium iodide structure in the solid state. In this way, the Tl centers are pyramidal and the oxide centers are octahedral.
Thallium oxide, like all thallium compounds, is highly toxic.
