Science and Mathematics Faculty Publications

Monoindenyl Titanium Alkyl Halides. The Synthesis and Molecular structures of (h5-C9H7)TiBr3, (h5-C9H7)Ti(CH3)Br2, and (h5-C9H7)Ti(CH3)Cl2

Document Type

Article

Publication Date

9-15-1999

Journal Title

Inorganica Chimica Acta

Volume

292

Issue

2

First Page

220

Last Page

224

Abstract

The monoindenyl titanium tribromide (η5-C9H7)TiBr3 (1), has been prepared from the interaction of TiBr4 and Bu3Sn&z.sbnd;C9H7. The monomethyl species (η5-C9H7)Ti(CH3)Br2 (2), and (η5-C9H7)Ti(CH3)Cl2 (3), have been efficiently prepared from the interaction of the trihalides with AlMe3. Complexes 1 and 2 represent rare examples of organotitanium bromides, and all three compounds are likely to be of interest in the context of homogeneous olefin polymerization catalysis. All three complexes have been characterized by 1H and 13C NMR spectroscopy and single crystal X-ray crystallography. These analyses reveal that the indenyl complexes exhibit a three-legged piano stool geometry in which the indenyl ligands are bound to the metal centers in an η5fashion. Crystal data for 1: (T=103 K), molecular formula, C9H7TiBr3, crystal system: monoclinic, space group P21/n, with a=7.155(1), b=12.682(1),c=12.216(1) Å, β=97.92°, V=1097.97 Å3, Z=4; 2: (T=103 K), molecular formula, C10H10TiBr2, crystal system: triclinic, space group P1, with a=7.142(1),b=12.501(1), c=7.117(1) Å, α=105.70(1), β=115.81(1), γ=88.21(1)°, V=547.91 Å3, Z=2; 3: (T=110 K), molecular formula, C10H10TiCl2, crystal system: orthorhombic, space group Pcab, with a=11.539(3), b=12.593(3), c=14.327(4) Å, V=2081.84 Å3, Z=8.

Keywords

Crystal structures; Titanium complexes; Indenyl complexes; Alkyl complexes; Halide complexes

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