C–F⋯Rb+ interaction in a fluorinated cage compound complex

A rubidium complex of a cage compound which is composed of fluorobenzene, ethylenedioxy, and bridgehead nitrogen donor units was prepared. The C–F⋯Rb+ interaction was clarified and evaluated for the first time by crystallographic analysis. The contribution degree of the three kinds of donor atoms for the cation binding was estimated by Brown’s bond valence equation.