| Oxidation State | Substances |
| Cu0 | rare [Cu (CO)3 ] at 10 K |
| CuI | Cu2O, CuCl, K [Cu (CN)2 ] |
| CuII | CuO, CuCl2 , Cu2+ salts |
| CuIII | K3 [CuF6 ] |
| CuIV | rare Cs2 [CuF6 ] |
Copper: Properties
Compound Substances
| Oxidation State | Substances |
| Cu0 | rare [Cu (CO)3 ] at 10 K |
| CuI | Cu2O, CuCl, K [Cu (CN)2 ] |
| CuII | CuO, CuCl2 , Cu2+ salts |
| CuIII | K3 [CuF6 ] |
| CuIV | rare Cs2 [CuF6 ] |