Cationic dialanes with fluxional π-bridged cyclopentadienyl ligands.

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

Low-Valent M Al Cluster Salts with Tetrahedral [SiAl ] and Trigonal-Bipyramidal [M Al ] Cores (M=Si/Ge).

Schnöckel's [(AlCp*) ] and Jutzi's [SiCp*][B(C F ) ] (Cp*=C Me ) are landmarks in modern main-group chemistry with diverse applications in synthesis and catalysis. Despite the isoelectronic relationship between the AlCp* and the [SiCp*] fragments, their mutual reactivity is hitherto unknown. Here, we report on their reaction giving the complex salts [Cp*Si(AlCp*) ][WCA] ([WCA] =[Al(OR ) ] and [F{Al(OR ) } ] ; R =C(CF ) ).