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The complex AsPh 4 [MoN(N 3 ) 4 ] is prepared by the reaction of AsPh 4 [MoNCl 4 ] with silver azide in dichloromethane suspension in the presence of dry sodium sulfate. The IR spectrum indicates an Mo≡N group and four covalently bonded N 3  groups for the [MoN(N 3 ) 4 ] ⊖  anion. AsPh 4 [MoN(N 3 ) 4 ] crystallizes in the triclinic space group P1̄ with two formula units in the unit cell. The crystal structure was solved by X-ray diffraction methods (R = 0,038; 4049 independent reflexions). The structure consists of AsPh 4 ⊕ cations and [MoN(N 3 ) 4 ] ⊖  anions. The short MoN bond length of the nitrido ligand (163 pm) corresponds to an Mo ≡ N triple bond. The steric effects of the lone pairs of the α-N atoms of the azido groups with tho MoN ligand cause a propellerlike twisted conformation of the four azido groups.

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Tetrazido-Nitrido-Molybdat(VI); Darstellung, IR-Spektrum und Kristallstruktur von AsPh 4 [MoN(N 3 ) 4 ] / Tetrazido-nitrido-molybdate(VI); Preparation, IR Spectrum and Crystal Structure of AsPh 4 [MoN(N 3 ) 4 ]