Cationic dialanes with fluxional π-bridged cyclopentadienyl ligands

Abstract

Unique π-cyclopentadienyl bridged dialanes are synthesized as complex salts with aluminate anions by comproportionation of aluminocenium cations [Al^III(Cp)(Cp*)]⁺/[Al^IIICp₂]⁺ with [(Al^ICp*)₄]. Very short Al–Al bond lengths occur in positively charged Al₂⁴⁺ fragments. Intriguingly, the prepared asymmetric dialane shows a unique fluxional coordination of the cyclopentadienyl ligands.