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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.

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The structure of the title compound, [V(C5H5)2Cl(C2H3N)][FeCl4], a potential spermicidally active species, has been determined. This compound has a typical bent metallocene structure, in which two η5-bonded cyclo­penta­dienyl rings, an N-coordinated acetonitrile molecule and a Cl ligand occupy tetrahedral positions around the VIV atom. The V—N bond length was found to be 2.087 (2) Å.

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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)°.

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The title compound, [ZrBr2(C13H24)], contains a pseudo-tetra­hedral ZrIV 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.

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In the crystal structure of the title compound, [SnBr2(C9H12N)2], the Sn atom is pseudo-octa­hedrally coordinated as a result of the C,N-chelation by the 2-(N,N-dimethyl­amino­meth­yl)phenyl groups and two cis-bonded bromides. The C atoms bonded to Sn are in trans positions [C-Sn-C = 156.7 (2)°] and the coordinated N atoms are bonded in a cis fashion [N-Sn = 2.581 (5) and 2.600 (5) Å; N-Sn-N = 103.88 (16)°].
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