The First Molybdenum(VI) and Tungsten(VI) Oxoazides MO 2 (N 3 ) 2 , MO 2 (N 3 ) 2 ⋅2 CH 3 CN, (bipy)MO 2 (N 3 ) 2 , and [MO 2 (N 3 ) 4 ] 2− (M=Mo, W)

Molybdenum(VI) and tungsten(VI) dioxodiazide, MO 2 (N 3 ) 2 (M=Mo, W), were prepared through fluoride–azide exchange reactions between MO 2 F 2 and Me 3 SiN 3 in SO 2 solution. In acetonitrile solution, the fluoride–azide exchange resulted in the isolation of the adducts MO 2 (N 3 ) 2 ⋅2 CH 3 CN. The subsequent reaction of MO 2 (N 3 ) 2 with 2,2′‐bipyridine (bipy) gave the bipyridine adducts (bipy)MO 2 (N 3 ) 2 . The hydrolysis of (bipy)MoO 2 (N 3 ) 2 resulted in the formation and isolation of [(bipy)MoO 2 N 3 ] 2 O. The tetraazido anions [MO 2 (N 3 ) 4 ] 2− were obtained by the reaction of MO 2 (N 3 ) 2 with two equivalents of ionic azide. Most molybdenum(VI) and tungsten(VI) dioxoazides were fully characterized by their vibrational spectra, impact, friction, and thermal sensitivity data and, in the case of (bipy)MoO 2 (N 3 ) 2 , (bipy)WO 2 (N 3 ) 2 , [PPh 4 ] 2 [MoO 2 (N 3 ) 4 ], [PPh 4 ] 2 [WO 2 (N 3 ) 4 ], and [(bipy)MoO 2 N 3 ] 2 O by their X‐ray crystal structures.