[(η5‐Cp)2Sn(μ‐η5‐Cp)Na · PMDETA], a Compound with a Trigonal‐Planar “Paddle Wheel” Triorganostannate Ion

An organotin(II) anion with three η5-Cp ligands and a Sn atom in a trigonal-planar environment are found in the title compound 1 (see diagram), obtained from the reaction of CpNa, [Cp2Sn], and PMDETA (mol ratio 1:1:1). This [Cp3Sn]− ion is linked to the Na+ ion by a μ-η5-Cp bridge. Compound 1 is a polymeric array in the solid state due to intermolecular C(H) …︁ Na interactions. PMDETA = (Me2NCH2CH2)2NMe.