Structural chemistry of titanium and aluminium bimetallic hydride complexes VI *. Molecular structure and physico-chemical properties of (η5-C5H5)2Ti(μ2-H)2Al(Cl)(μ2-H)2Ti(η5-C5H5)2, a catalyst-precursor for hydrogenation in the 5-C5H5)2TiCl>2-LiAAlH4 system

Article abstract of DOI:10.1016/S0022-328X(00)99407-5

The complex (Cp2Ti)2AlH4Cl system has been isolated from the catalytic system (Cp2TiCl)2-LiAlH4, which is a precursor of the catalyst for the hydrogenation and isomerization of olefins.This complex has been studied by X-ray diffraction.The complex forms rhomboidal crystals with unit cell dimensions a=16.008 Angstroem, space group P2₁2₁2₁, Z=4, and density ρ_calc=1.40 g/cm³.The Cp2Ti moieties are linked to the Al atom via double hydrogen bridges; the Cl atom is bonded to the Al atom.Analysis of the EPR spectral data and some chemical properties of (Cp2Ti)2AlH4Cl solutions has led us to suggest a mechanism for the formation of the catalytically active species upon interaction of this compound with olefins and solvating solvents.