Allyl derivatives of (cyclo-octatetraene)(η- pentamethylcyclopentadienyl)-zirconium: X-ray crystal structure of [Zr(η-C₅Me₅)(1–4-η-C₈H₈)(η-C₃H₅)]

Synthesis and Structural Characterization of New Zirconium(IV) Bent Metallocenes comprising η8‐Cyclooctatetraenyl and Bulky Cyclopentadienyl Ligands

“…This coordination mode is typical for Zr complexes with less bulky ligands, whereas the COT ligand displays a less symmetric coordination in sterically crowded complexes (e.g. η 6 ‐COT, η 4 ‐COT) . In the title compounds, the Zr–Cp contact is in a range of 219–223 pm and therefore considerably longer than the Zr–COT contact.…”

“…Several zirconium(IV) complexes comprising the COT ligand [= 1,4‐(Me 3 Si) 2 C 8 H 6 ] have also been described . Moreover, significant achievements in zirconium COT chemistry were made by combing COT and pentamethylcyclopentadienyl (Cp*) ligands in the coordination sphere of Zr . Particularly remarkable among this series was the formation of Cp*Zr(μ‐η 8 :η 2 ‐C 8 H 6 )ZrCp*(η 4 ‐COT), a dinuclear zwitterionic zirconium complex with a bridging cyclooctatrienyne ligand .…”

Mixed-sandwich complexes of zirconium(III) and hafnium(III): Potential analogues of [U(η-C8H6{Si Pr3-1,4}2)(η-Cp∗)] for cyclooligomerisation of CO

“…[Zr(h 8 -COT)(h-Cp * )Cl] has been reported but not structurally characterised [8], and other analogues of 2 (or indeed 5) have not been described.…”

“…We have recently reported the reductive cyclooligomerisation of CO by mixed-sandwich U(III) complexes of the type [U(h-C 8 [4].…”

Structure of (η5-C5Me5)(η8-C8H8)Zr, an aromatic mixed sandwich complex of zirconium(III)

“…The cyclooctatetraene ligand has been shown to exhibit a variety of bonding modes to zirconium [2][3][4][5][6][7][8], however, in none of these has a sandwich complex of two planar aromatic rings been observed. In contrast, with the smaller titanium, (η 5 -C 5 H 5 )(η 8 -C 8 H 8 )Ti [9], (η 5 -C 5 Me 5 )(η 8 -C 8 H 8 )Ti [1], (η 5 -C 5 H 5 )(η 7 -C 7 H 7 )Ti [10], and (η 5 -C 5 Me 5 )(η 7 -C 7 H 7 )Ti [1] have been prepared and structurally characterized.…”