Synthesis and structures of cyclopentadienyl fluoro and chloro complexes of a triad (Ti, Zr, Hf) containing acyclic and cyclic siloxane building blocks

Abstract

Cyclic and acyclic monocyclopentadienyl fluoro and chloro titanium siloxanes have been synthesised. The fluoro complexes are cyclic, whereas acyclic chloro derivatives are accessible when using bulky cyclopentadienyl ligands. Acyclic bis(cyclopentadienyl) fluoro and chloro siloxanes of titanium, zirconium and hafnium have also been prepared. The crystal structures of two cyclic titanium derivatives [{(C₅Me₄Et)FTiOSiBu^t₂O}₂][triclinic, space group P, a= 9.644(3), b= 11.397(3), c= 11.822(3)Å, α= 116.702(10), β= 104.507(12), γ= 98.906(8)°, Z= 1] and [{(C₅H₄Me)FTiOSiBu^t₂O}₂][monoclinic, space group C2/c, a= 29.75(2), b= 13.152(8), c= 22.332(11)Å, β= 124.88(3)°, Z= 8] have been determined.