In the title compound, (C11H21N2)[Er(C8H8)2], the anion displays the sandwich form with planar and parallel cyclooctatetraenyl ligands. The perpendicular distances of the Er atom from the C8 planes are 1.8809 (7) and 1.8476 (8) Å, with individual Er—C bond lengths in the range 2.596 (2)–2.651 (2) Å. The extended structure consists of chains of alternating anions and cations parallel to (101); residues are connected by C—H⋯π interactions and neighbouring formula units are related by an n glide plane.
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Jones et al. (2007) studied this question.