CsO2

CsO2, or cesium superoxide, is an inorganic compound composed of cesium cations (Cs+) and the superoxide anion (O2−). It is the cesium salt of the superoxide group and belongs to the family of alkali metal superoxides, alongside KO2 and RbO2. In solid form it is typically a white to pale material that is highly reactive with moisture and air.

Preparation and reactivity

CsO2 is typically prepared by direct reaction of elemental cesium with oxygen at elevated temperature: 2 Cs + O2 → 2 CsO2. It is a highly reactive oxidizer and readily reacts with water and moisture in the environment. Upon contact with water, CsO2 reacts to yield cesium hydroxide, hydrogen peroxide, and oxygen, following a representative equation: 2 CsO2 + 2 H2O → 2 CsOH + H2O2 + O2. Because of its reactivity, CsO2 is handled under strictly dry, inert or controlled conditions.

Properties

As a solid, CsO2 is moisture-sensitive and decomposes or reacts upon exposure to air or humidity. It is a strong oxidizing agent, and its handling requires precautions to prevent contact with water, organic materials, or reducing substances. When used or stored properly under dry conditions, it can exist as a stable salt of the superoxide group.

Applications

CsO2 has applications as an oxidizer and as a source of oxygen in certain closed or specialized environments, including life-support concepts for space missions. It is also used in research and synthesis involving reactive oxygen species.

Safety

Strong oxidizer; reacts violently with water and many organic materials. Proper handling involves dry, inert atmospheres, appropriate shielding, and adherence to safety protocols to manage heat release and gas evolution.