Nukleophile Substitution an Thionyl- und Sulfurylchlorid mit Metallaten. Synthese und Struktur der SO- bzw. S 0 2-Komplexe [(C6H5O)3P]2(CO)2Fe(SOn)(n=1, 2) / Nucleophilic Substitution at Thionyl- and Sulfuryl Chloride by Metallates. Synthesis and Structure of the SO- and SO2-Complexes [(C6H5O)3P]2(CO)2Fe(SOn)(n=1, 2)
The synthesis of the SO- and SO2-complexes 3 and 4 follows equations (1) and (3) by nucleophilic substitution of SOCl2 or SO2Cl2 by the same metallate 2. 4 can also be obtained by simple air oxidation of solutions of 3 according to equation (2). Spectroscopic investigations indicate a trigonal bipyramidal configuration on iron with both phosphite ligands in axial positions and the sulfur oxide ligands in equatorial positions together with both carbonyl ligands. The X-ray structure analysis of the SO2 complex 4 shows the exactly planar coordination of the sulfur atom and the nearly perpendicular orientation of the SO2 plane to the equator plane; thus complex 4 is isolobal to SO3. The SO ligand in 3 coordinates as a 2c-2e-system in a bent structure with both atoms lying in the equatorial plane.