{(η⁵,κN)-[(tert-Butyl­amido)dimethyl­silyl]cyclo­pentadienyl}dichlorotitanium(IV)

The crystal structure of the title compound, [Ti(C₁₁H₁₉NSi)Cl₂], has been determined as part of a broad investigation of half-sandwich titanium complexes. Titanium has a pseudo-tetrahedral coordination formed by two Cl atoms [Ti—Cl = 2.2719 (4) and 2.2730 (4) Å], the N atom of the N-tert-butyl group [Ti—N = 1.9094 (12) Å] and the silyl-substituted Cp ligand [metal–Cp ring centroid distance = 2.0185 (9) Å]. The tert-butyl group was found to be disordered.

Difluoro­(η⁵,η⁵-propane-2,2-diyldicyclo­pentadienyl)titanium(IV)

In the title compound, [Ti(C₁₃H₁₄)F₂], the coordination polyhedron around the Ti atom is a distorted tetra­hedron defined by the centroids of the cyclo­penta­dien­yl rings and the two F atoms. The Ti–ring centroid (Cg) distances are 2.0558 (7) and 2.0567 (8) Å. The presence of a short carbon bridge linking the cyclo­penta­dien­yl rings constrains the Cg—Ti—Cg angle to a value of 121.50 (3)°.

Dibromo­(η⁵,η⁵-propane-2,2-diyldicyclo­penta­dien­yl)zirconium(IV)

The title compound, [ZrBr₂(C₁₃H₂₄)], contains a pseudo-tetra­hedral Zr^IV centre involving two η⁵-bonded cyclo­penta­dienyl rings [Zr—Cg = 2.1843 (12) Å; Cg is the centroid of a cyclo­penta­dienyl ring] and two Br atoms [Zr—Br = 2.5828 (5) and 2.5879 (6) Å]. The angle Cg1—Zr—Cg2 is constrained to a value of 116.80 (5)° due to the presence of a short inter­annular 2,2-propyl­idene bridge. The Zr and Br atoms lie on a crystallographic mirror plane, which bisects the organic ligand.