A molecular Mo4Bi4 framework composed exclusively of unsupported metal–metal bonds

Abstract

Reaction of [Cp₂MoH₂] with bismuth allyloxide, [Bi{OCH(CH₃)CHCH₂}₃], gave rise to an extended octanuclear complex wherein two cyclic Mo₂Bi₂ units composed of four Mo–Bi bonds are linked by a Bi–Bi bond. The fact that the construction of such an assembly could be accomplished only in the case of a monomethylation of the parent allyl residue demonstrates a subtle substituent effect.