| Abstract: | ![]()
Reaction of Trichloronitro Methane with Iron Carbonyls. Crystal Structure of (PPh4)2[Fe2OCl6] · 2 CH2Cl2 Trichloronitro methane reacts with Fe2(CO)9 or Fe3(CO)12 forming NO[FeOCl2] which is composed of Nitrosyl ions and polymeric [FeOCl2]?. The reaction of NO[FeOCl2] with POCl3 affords Fe(O2PCl2)3; with tetraphenyl phosphoniumchloride it forms the complex (PPh4)2[Fe2OCl6] which is soluble in CH2Cl2. The oxochloro ferrates are characterized by the aid of 57Fe-Mössbauer spectra and by i.r. spectra. A single crystal of (PPh4)2[Fe2OCl6] · 2 CH2Cl2 was used to carry out a structural investigation by means of X-ray diffraction data (space group P1 , Z = 1, a = 1157.2(2), b = 1363.8(3), c = 1140.3(2) pm, α = 109.22(1)°, β = 95.23(1)°, γ = 67.24(2)°, R = 0.052 for 3814 reflexions with F0 > 3σ). The [Cl3Fe? O? FeCl3]2?-anion is found to have a centre of symmetry and thus, in accordance with the i.r. spectra, contains a linear bridge. High thermal parameters of the bridging oxygen atom and the chlorine ligands, however, allow interpretations as orientation disorder of slightly bent anions. |
