 Polystannane

Polystannanes are organotin compounds with the formula (R2Sn)n. These polymers have been of intermittent academic interest; they are unusual because heavy elements comprise the backbone.Structurally related but better characterized (and more useful) are the polysilanes (R2Si)n.
Oligo- or polystannanes were first described by Löwig in 1852, only 2 years after Edward Frankland's report on the isolation of the first organotin compounds.