(PPh4)2[OsCl3(NO)(SnCl3)2] Synthese,IR-Spektrum und Kristallstruktur

(PPh₄)₂OsCl₃(NO) (SnCl₃)₂]; Preparation, I.R. Spectrum, and Crystal Structure (P(C₆H₅)₄)₂OsCl₃(NO)(SnCl₃)₂] yields from the reaction of OsCl₃(NO) with PPh₄-SnCl₃] in dichloro methane forming red crystals. The complex crystallizes monoclinic in the space group C2/c with four formula units per unit cell. The crystal structure was determined by aid of X-ray diffraction data (2261 independent, observed reflexions, R = 4.9%). The cell parameters are a = 1369, b = 1989, c = 2088 pm, β = 99.54°. The structure consists of tetraphenyl phosphonium cations and OsCl₃(NO)(SnCl₃)₂]^2?-anions. In the anion the osmium is coordinated octahedrally by three chlorine atoms (mean bond length r Os? Cl 238 pm), two SnCl₃ groups in transposition to each other (r Os? Sn 265 pm) and the N-atom of the covalently bonded nitrosyl ligand (r Os? N 173 pm). The i.r. spectrum of the anion is reported and assigned.