Arsenic triazide is an inorganic chemical compound with the formula As(N3)3.

It is a toxic, shock-sensitive, and friction-sensitive white solid that melts at 37 °C and explodes on further heating.

[1] Arsenic triazide was first synthesized by Thomas M. Klapötke in 1995 by the reaction of arsenic trichloride and sodium azide in trichlorofluoromethane at 0 °C:[3] A purer product was obtained by another synthesis route by Karl O. Christe in 2004 by the reaction of arsenic trifluoride and trimethylsilyl azide.

[1] Both in the gas and solid phase, arsenic triazide adopts a trigonal pyramidal geometry around the arsenic atom with a bond angle of 88.3°; this low bond angle is attributed to the major p-character of the bonding orbitals.

However, in the solid phase, arsenic triazide attains a coordination number of 7, different from the gas phase, which has a coordination number of 4.