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Attempted synthesis of sterically demanding bis- or tris-beta-diketiminato complexes of lanthanoids resulted in ligand deprotonation and the formation of complexes containing both a "normal" and a deprotonated ligand; one of these on protonation gave the first cationic beta-diketiminato-Ln complex.
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Hitchcock et al. (2005) studied this question.
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