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Low-Coordinate Mixed Ligand NacNac Complexes of Rare Earth Metals. | LitMetric
We report the synthesis and characterization of two types of new mixed-ligand rare earth complexes: tetracoordinate (NacNac)Ln(BIAN) (Ln = Dy (), Er () and Y ()) and pentacoordinate (NacNac)Ln(AP)(THF) (Ln = Dy (), Er () and Y ()). The first three compounds were prepared by the reaction of [(BIAN)LnI] with potassium β-diketiminate. The salt metathesis of β-diketiminato-supported rare earth dichlorides (NacNac)LnCl(THF) with sodium o-amidophenolate results in compounds -. The crystal structures of complexes - were determined by single-crystal analysis. The combination of bulky monoanionic N-mesityl-substituted β-diketiminates with sterically hindered redox-active ligands led to the very low coordination numbers of rare earths and strong distortion of the chelate ligands.
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