Nitrogen tribromide is a chemical compound with the formula NBr₃. It is extremely explosive in its pure form, even at −100°C, and was not isolated until 1975. It is a deep-red, volatile solid, and was first prepared by the bromination of bistrimethlysilylbromamine with BrCl at −87°C:
₂NBr + 2 BrCl → NBr₃ + 2

It reacts instantly with ammonia

Ammonia

Ammonia is a compound of nitrogen and hydrogen with the formula . It is a colourless gas with a characteristic pungent odour. Ammonia contributes significantly to the nutritional needs of terrestrial organisms by serving as a precursor to food and fertilizers. Ammonia, either directly or...

 in dichloromethane

Dichloromethane

Dichloromethane is an organic compound with the formula CH2Cl2. This colorless, volatile liquid with a moderately sweet aroma is widely used as a solvent. Although it is not miscible with water, it is miscible with many organic solvents...

solution at −87°C to yield NBrH₂.