Die isoelektronischen Molekülkomplexe TiCl₃(NPPh₃) und TiCl₃(OSiPh₃) / The Isoelectronic Molecular Complexes TiCl₃(NPPh₃) and TiCl₃(OSiPh₃)

Abstract

Abstract TiCl 3 (NPPh 3 ) and TiCl 3 (OSiPh 3 ) have been prepared from titanium tetrachloride and Me 3 SiNPPh 3 and HOSiPh 3 , respectively. Both complexes were characterized by IR spectroscopy and by crystal structure determinations. TiCl 3 (NPPh 3 ): Space group R3̄̅, Z = 6, structure analysis with 959 observed unique reflections, R = 0.039. Lattice dimensions at -68°C: a = b = 1370.5(7), c = 1845.9(9) pm. TiCl 3 (OSiPh 3 ): Space group P2 1 /c, Z = 8, structure analysis with 4549 observed unique reflections, R = 0.049. Lattice dimensions at 19°C: a = 2127.7(2), b = 947.2(1), c = 2136.8(1) pm, β = 105.081(5)°. Both complexes form monomeric molecules in which the titanium atom is tetrahedrally coordinated by three chlorine atoms, the nitrogen atom of the phosphorone iminato ligand and the oxygen atom of the silyloxy group, respectively. The bond lengths TiN of 171.9(4) pm and TiO of 171.0(3) (in average) correspond to double bonds.