Structural characterization of the columnar alkali metal cyclopentadienide [K{C5H2(SiMe3)3-1,2,4}]∞†
Abstract
Unsolvated 1,2,4-tris(trimethylsilyl)cyclopentadienyl potassium (K[Cp3Si]) crystallizes as a base-free “super-sandwich” of alternating potassium ions and Cp′ rings. The polymeric chains in the structure are not connected as in other unsolvated KCp′ structures, but uniquely consist of independent columns. This type of structure has previously been observed in base-free lithium