N‐Cesiocarbazole ṁ pmdta and N‐Potassiocarbazole ṁ pmdta (PMDTA = N,N,N′,N″,N″‐Pentamethyldiethylenetriamine). Cation Size and Multihapto Bonding

Both σ and π interactions should characterize the solid-state structures of salts such as N lithiopyrrole. This prediction has been only partially confirmed in the case of the lower alkali metals, but carbazole salts of the higher homologues potassium and cesium indeed show multihapto coordinations of eight and nine/eight, respectively. The structure of the Ci-symmetrical dimer of the cesium salt is shown as an example.