Electronic structure of bis-cyclopentadienyl-titanium dihalides as indicated by UV photoelectron spectroscopy

Add time:08/12/2019    Source:sciencedirect.com

The He(I) photoelectron spectra have been obtained for a series of bis(η5-cyclopentadienyl)titanium dihalide complexes (C5H5-n(CH3)n)2TiCl2 (n = 0, 1, 3, 4, 5) and (C5H5-n(CH3)n)2(TiBr2 (n = 0, 1, 3). From the progressive displacements of the photoionization bands upon methylation it follows that the cyclopentadienyl π-orbitals are ionized at lower energies than halogen lone pairs. The cyclopentadienyl a1 + b1 symmetry species lie above the a2 + b2 ones. The dichloride and dibromide complexes do not differ in the extent of interaction between halogen p orbitals and cyclopentadienyl π=orbitals.

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