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MoF 4 (NCl) has been prepared as a yellow crystal powder by the reaction of diluted fluorine with MoCl 3 (N 3 S 2 ) at room temperature. The compound is associated via fluorine bridges, according to the IR spectrum. With acetonitrile, the monomeric complex [CH 3 CN -MoF 4 (NCl)] is obtained, which was characterized by its IR and  19 F NMR spectra as well as by an X-ray structure determination. Crystal data: space group Pm, Z = 2 (1068 observed, independent reflexions, R = 0.03). Lattice dimensions at -90 °C: a = 507.1. b = 704.8, c = 995.8 pm, β = 102.02°. The unit cell contains two crystallographically independent molecules [CH 3 CN -MoF 4 (NCl)], the Mo≡N-Cl groups being linear (bond angles 176°, 178°) with bond lengths MoN = 172 and NCI = 159, 162 pm. In the trans position to the MoNCl group, the nitrogen atom of the acetonitrile molecule is coordinated.

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N-Chlor-Nitrenokomplexe des Molybdäns: MoF 4 (NCl) und [CH 3 CN-MoF 4 (NCl)] / N-Chloro-Nitrene Complexes of Molybdenum: MoF 4 (NCl) and [CH 3 CN-MoF 4 (NCl)]