Titanium and zirconium ketimide complexes: synthesis and ethylene polymerisation catalysis

Quantifying the Electron Donor and Acceptor Abilities of the Ketimide Ligands in M(N═CtBu2)4 (M = V, Nb, Ta)

“…17,18 In addition, the average Ta-N-C angle (172.7°) is indicative of sp hybridization at nitrogen, and is suggestive of significant π-donation from the ketimide to the metal, consistent with our ligand field analysis (see below). 3,4,6,19 Finally, the Ta-Cl bond lengths (2.498(1), 2.496(1) Å) are similar to those observed for other structurally characterized Ta(V) chlorides. 14,15,20–22 …”

(Pentabenzylcyclopentadienyl)molybdenum Complexes: Synthesis, Structures and Redox Properties

“…[16] This difference reflects an asymmetry in the metal-ring bonding that is reminiscent of an η 3 +η 2 coordination. [20][21][22][23] The molecular structure of [Mo(CpBz)(CO) 2 ] 2 is depicted in Figure 2 and some selected distances and angles are listed in Table 1. The molybdenum coordination is best described as a distorted piano-stool geometry with basal angles ranging between 71.43 (8) .…”

Synthesis of a cobalt(iv) ketimide with a squashed tetrahedral geometry

“…These products are derived from the 1e À oxidation of the ketimide ligand by the Co 4+ center. 14 It is important to note that the d 0 complex, Ti(NQC t Bu) 4 , adopts a tetrahedral (T d ) coordination geometry, 17 thus signifying that the 3d-metal, tetra(ketimide) motif can sterically accommodate N-M-N angles near 1091. This observation suggests that electronic, rather than steric, factors dictate the D 2d geometries found for complexes 3 and 4.…”