The name Cobalt was taken from a mineral used for the production of a blue colour in glass. In 1735 Georg Brandt (1694-1768) identified some properties of cobalt.
Cobalt is a strategic metal with very important applications, including those requiring heat-resistant materials such as jet engines. The major source of cobalt is as a by-product of copper refining although it can also be obtained as a by-product of nickel and lead.
Cobalt(III) complexes display a range of colours:
- [CoF6]3- - Green
- [Co(NH3)5Cl]2+ - Violet
- [Co(H2O)6]3+ - Blue
- [Co(NH3)5(H2O]3+ - Red
- [Co(NH3)6]3+ - Yellow-orange
- Tail of absorption band in visible spectrum is yellowElectron Shell: