Other compounds

M^II organometallic compounds are initiate with cyclopentadienyl. Sn(C₅H₅)₂ comprise a 'bent sandwich' structure 2, in which the stereochemical influence of the lone-pair is clear. M^IV organometallic compounds along with M-C σ bonding are very varied and involve simple tetraalkyls MR₄ and compounds with Sn-Sn bonds identical to those of Si and Ge. Tetraethyl lead has been extensively used as a gasoline additive to enhance combustion but is being phased out due to the toxic hazard related with all lead compounds.

Reaction of alloys like NaSnx with macrocyclic ligands in amine solvents provides compounds containing anionic clusters like [Sn₅]^2-, [Sn₉]^4- and [Pb₅]^2-. These comprise multicenter metal-metal bonding that can frequently be rationalized by Wade's rules.