Characteristic

Cobalt(II) iodide or cobaltous iodide are the inorganic compounds with the formula CoI₂ and the hexahydrate CoI₂(H₂O)₆. These salts are the principal iodides of cobalt.

Chemical formula：CoI₂

Molar mass：312.7421 g/mol (anhydrous)

                      420.83 g/mol (hexahydrate)

Appearance：α-form: black hexagonal crystal

                       β-form: yellow powder

Density：α-form: 5.584 g/cm³

                β-form: 5.45 g/cm³

hexahydrate: 2.79 g/cm³

Melting point：α-form: 515-520 °C under vacuum

                          β-form: converts to α-form at 400 °C

Boiling point：570 °C (1,058 °F; 843 K)

Solubility in water：67.0 g/100 mL

Magnetic susceptibility (χ)：+10,760·10⁻⁶ cm³/mol