Tetrahalomethane

Tetrahalomethanes are fully halogenated methane derivatives of general formula CF_kCl_lBr_mI_nAt_p, where:

k+l+m+n+p=4

Tetrahalomethanes are on the border of inorganic and organic chemistry, thus they can be assigned both inorganic and organic names by IUPAC: tetrafluoromethane - carbon tetrafluoride, tetraiodomethane - carbon tetraiodide, dichlorodifluoromethane - carbon dichloride difluoride.

Each halogen (F, Cl, Br, I, At) forms a corresponding halomethane, but their stability decreases in order CF₄ > CCl₄ > CBr₄ > CI₄ from exceptionally stable gaseous tetrafluoromethane with bond energy 515 kJ·mol⁻¹ to solid tetraiodomethane, depending on bond energy.

Many mixed halomethanes are also known, such as CBrClF₂.

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