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Green crystals of the title compound are formed in the reaction of (PPh 4 ) 2  [Mo 2 (O 2 C -Ph) 4 Cl 2 ] ·2 CH 2 Cl 2  with dimethyl formamide/carbon tetrachloride in the presence of water. According to the structural investigations by X-ray methods PPh 4 [MoCl 4 (O CHNMe 2 )] crystallizes orthorhombically in the space group C222 1  with four formula units per unit cell (3132 observed, independent reflexions, R - 0.068). The cell dimensions are a = 792.1 pm, b = 1656.8 pm, c = 2211.3 pm. The structure consists of PPh 4  ⊕  cations and anions [MoOCl 4 (OCHNMe 2 )] ⊖ , in which the coordination sphere of the molybdenum atom is of distorted octahedral geometry. The ligands are four equatorial chlorine atoms, one terminal O atom (Mo = O 165 pm) and the O atom of the dimethyl formamide molecule (MoO 232 pm). The IR spectrum is reported

Die Kristallstruktur von PPh 4 [MoOCl 4 (OCHNMe 2 )] / The Crystal Structure of PPh 4 [MoOCl 4 (OCHNMe 2 )]