Portal de Periódicos da CAPES

Synthesis of Group 4 metal compounds containing cyclopentadienyl ligands with a pendant alkoxide function: molecular structure of {[η5:η1-C5H4(CH2)2O]TiCl2}2 and [η5:η1-C5H4CH2)3O]TiCl2

1996; Elsevier BV; Volume: 511; Issue: 1-2 Linguagem: Inglês

10.1016/0022-328x(95)05935-i

1872-8561

Gwenaëlle Trouvé, Dietmar A. Laske, Auke Meetsma, Jan H. Teuben,

Carbon dioxide utilization in catalysis

Trimethysilylcylocpentadiene-siloxy ethers Me3SiC5H4(CH)3 (n = 2,3) react with TiCl4 to give (2-(cyclopentadienyl)-eth-1-oxy) titanium dichloride, [[η5:η1-C5H4(CH2)2O]TiCl2]2 and (3-(cyclopentadienyl)-prop-1-oxy(titanium dichloride [η5:η1-C5H4(CH2)2O]TiCl2, by release of two equivalents of Me3SiCl. Molecular structure determination shows that [η5:η1-C5H4(CH2)2O]TiCl2 is a monomer with a bidentate cyclopentadientyl-alkoxide ligand. [[η5:η1-C5H4(CH2)2O]TiCl2]2 crystallizes in the triclinic space group Pt1̄ with a = 7.702(1) Å, b = 7.942(2) Å, α = 71.39(1)°, β = 89.92(1)°, γ = 61.25(2)°, V = 412.27(16) Å3 and Z = 1. The basic structure consists of a dimer molecule with a crystallographic center of inversion, coupled by two TiOTi bridges. Crystals of [η5:η1-C5H4(CH2)2O]TiCl2]2 are triclinic, space group Pt1̄ with a = 8.194(1), b = 11.002(1), c =11.1921(1) Å, α = 84.339(5), β = 88.035(5), γ = 76.256(6)°, V = 975.2 Å3 and Z = 4. Two crystallography independent molecules are present in the asymmetric unit.