Ln(III) Alkoxide complexes
These examples show how the size of the ligand influences the structure of the complex.
Click on the links to display the structures
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[La3(m3-OBut)2(m2-OBut)3(OBut)4(ButOH)2] The -OBut ligand is not sufficiently sterically demanding to stabilise a monomeric [La(OBut)3] complex. Higher coordination numbers are achieved by formation of a tri-nuclear complex with terminal, doubly- and triply-bridging alkoxide ligands. Note that there are no La-La bonds, although Jmol may show some. |
[Ce(O-2,6-But2-C4H3)3] The substituents in the
2,6 positions of this aryloxide make it very sterically demanding, and
3-coordinate monomeric complexes with all Ln(III) are known |
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