A persistent C–H⋯C(π) T-stacked cationElectronic supplementary information (ESI) available: DFT calculations. See http://www.rsc.org/suppdata/cc/b0/b005450j/
Abstract
The reaction of 2 equivalents of 1,3-dimesitylimidazolium chloride with Cp3Yb affords the salt [bis(1,3-dimesitylimidazolium)cyclopentadienide] [bis(cyclopentadienyl)dichloroytterbate]; the T-stacked cation is composed of two imidazolium fragments that are C–H⋯C(π) hydrogen bonded to the bridging cyclopentadienide anion.