An indenide-tethered N-heterocyclic stannylene

Abstract

The structure of (μ-1κN:2(η²),κ² N,N'-(2-{[2,6-bis(propan-2-yl)phen-yl]aza-nid-yl}eth-yl)[2-(1H-inden-1-yl)eth-yl]aza-nido)(1,4,7,10,13,16-hexa-oxa-cyclo-octa-dec-ane-1κ⁶ O)lithiumtin, [LiSn(C₈H₁₆O₄)(C₂₅H₃₁N₂)], at 100 K has monoclinic (P2₁/n) symmetry. Analysis of the coordination of the Sn to the indenyl ring shows that the Sn inter-acts in an η² fashion. A database survey showed that whilst this coordination mode is unusual for Ge and Pb compounds, Sn displays a wider range of coordination modes to cyclo-penta-dienyl ligands and their derivatives.

Keywords: crystal structure; indenyl donor group; stannylene; η-2 coordination.