s-bonded alkyl complexes of Ln

Anionic 'ate' complexes are stabilized by having increased coordination numbers. Low coordination numbers can be stabilized by very bulky ligands e.g. {CH(SiMe3)2}- Click on the links to display the structures

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6-coordinate 'ate' complex
[Li(tmeda)]3[LuMe6]

6-coordinate complex with chelating donor-functionalized ligand
[Lu(C6H4CH2NMe2)3]

3-coordinate complex with bulky alkyl. This ligand is very similar to silylamide {N(SiMe3)2}-
[La{CH(SiMe3)2}3]

 2-coordinate Yb2+ complex with extremely bulky alkyl. Stabilized by short 'agostic' C-Yb interactions
[Yb{C(SiMe3)3}3]

CHEM411 index