Carbon Tetrafluoride
Definition and meaning of Carbon Tetrafluoride in chemistry.
Carbon tetrafluoride (CF4) is a colorless, odorless, nonflammable gas in which a single carbon atom is bonded to four fluorine atoms in a tetrahedral arrangement, making it the simplest perfluorocarbon.
In more detail
CF4's remarkable chemical inertness arises from the strength of the C–F bond (roughly 485 kJ/mol) and the symmetric shielding of the carbon center by four electronegative fluorine atoms, which blocks nucleophilic attack and hydrolysis. Despite this stability at Earth's surface, CF4 is an extremely potent and long-lived greenhouse gas, persisting in the atmosphere for tens of thousands of years with a global warming potential thousands of times that of carbon dioxide. It forms industrially by direct fluorination of methane and is also released as an unwanted byproduct during aluminum smelting.
Key facts
| Formula | CF4 |
|---|---|
| Molar Mass | 88.01 g/mol |
| Boiling Point | -128 °C (-198 °F) |
| Field | Inorganic Chemistry |
In semiconductor manufacturing, CF4 gas is introduced into a plasma reactor, where an electric discharge breaks it into reactive fluorine radicals that etch patterns into silicon and silicon dioxide layers on a chip.
Frequently asked questions
Why is carbon tetrafluoride so unreactive?
Its strong C–F bonds and the tight, symmetric shielding of the carbon atom by four fluorines prevent typical substitution or hydrolysis reactions, unlike many other carbon halides.
Is CF4 dangerous?
It is not flammable and has low direct toxicity, but it can displace oxygen in enclosed spaces (asphyxiation risk) and is a major environmental concern as a potent, long-lived greenhouse gas.