Figure 4.
Geometry optimized cyclic Zr-C7 and acyclic Zr-L7 complexes. The arrows indicate the two open alkyl chains. Carbon in green, oxygen in red, nitrogen in blue and central zirconium in grey color (hydrogen atoms not shown). Average NO-Zr bond length is 2.169 Å in Zr-L7 and 2.167 Å in Zr-C7 and average CO-Zr bond length is 2.289 Å in Zr-L7 and 2.296 Å in Zr-C7. These calculated bond lengths are all comparable to those determined by X-ray diffraction of the crystalline Zr(Me-AHA)4 (NO-Zr = 2.183 Å and CO-Zr = 2.204 Å). The coordinates of the complexes and ligands discussed in this paper are all available in supporting information.