Trinitromethane

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Trinitromethane

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Template:Longitem	CHN3O6
Molar mass	151.04 g/mol
Appearance	Pale yellow crystals
Density	1.469 g/cm3
Melting point	Template:Chembox CalcTemperatures
Acidity (pKa)	0.25 (see text)
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Template:Longitem	Hexanitroethane Octanitropentane Tetranitromethane

Trinitromethane, also referred to as nitroform, is a nitroalkane and oxidizer with chemical formula HC(NO₂)₃. It was first obtained in 1857 as the ammonium salt by the Russian chemist Template:Ill (1830–1908). In 1900, it was discovered that nitroform can be produced by the reaction of acetylene with anhydrous nitric acid. This method went on to become the industrial process of choice during the 20th century. In the laboratory, nitroform can also be produced by hydrolysis of tetranitromethane under mild basic conditions.

Acidity

Trinitromethane as a neutral molecule is colorless. It is highly acidic, easily forming an intensely yellow anion, (NO₂)₃C⁻ (nitroformate). The pK_a of trinitromethane has been measured at 0.17 ± 0.02 at 20 °C, which is remarkably acidic for a methane derivative. Trinitromethane easily dissolves in water to form an acidic yellow solution.

There is some evidence that the anion, which obeys the 4n+2 Hückel rule, displays Y-aromaticity, a form of aromaticity disputed among chemists.

Nitroform salts

Trinitromethane forms a series of bright yellow ionic salts. Many of these salts tend to be unstable and can be easily detonated by heat or impact.

The potassium salt of nitroform, KC(NO₂)₃ is a lemon yellow crystalline solid that decomposes slowly at room temperatures and explodes above 95 °C. The ammonium salt is somewhat more stable, and deflagrates or explodes above 200 °C. The hydrazine salt, hydrazinium nitroformate is thermally stable to above 125 °C and is being investigated as an ecologically friendly oxidizer for use in solid fuels for rockets.

Condensation with formaldehyde

As found by British chemists Hurd and Starke during WWII, trinitromethane reacts with paraformaldehyde, giving Template:Ill. This compound is a solvent to nitrocellulose and a precursor to high explosives such as trinitroethylorthoformate and trinitroethylorthocarbonate.