The action of carbon monoxide on nickel metal leads to nickel carbonyl :
Ni + 4 CO → [Ni (CO)
4
]
This compound is a volatile, colorless, highly toxic liquid with a boiling point of 34°C. These characteristics were very surprising at the time of its discovery, a time when the idea of covalent bonding as defined by Lewis was not yet advanced. It was soon discovered that this compound is sensitive to heat, and a higher temperature will decompose it:
[Ni (CO)
...
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