title: Synthesis, characterization, and bonding properties of polymeric fullerides AC70.nNH3 (A = Ca, Sr, Ba, Eu, Yb).
abstract: Reduction of C70 with alkaline earth and rare earth metals dissolved in liquid ammonia results in metal fulleride solvates AC70.nNH3 (A = Ca, Sr, Ba, Eu, Yb) containing linear polymeric, anionic chains infinity 1 [C70(2-)]. The compounds were characterised by means of Raman spectroscopy and single-crystal structure determination. The accurate crystal structure of [Sr(NH3)8]C70.3NH3, determined with atomic resolution, allowed for a comparison with results of quantum chemical calculations. The nature of the C-C bonds in the fulleride is analysed in detail leading to a model explaining the unexpected polymerisation of C70(2-).
authors.affiliation: Max-Planck-Institut für Festkörperforschung Heisenbergstrasse 1, 70569 Stuttgart, Germany.
authors.forename: Ulrich
authors.initials: U
authors.lastname: Wedig
authors.forename: Holger
authors.initials: H
authors.lastname: Brumm
authors.forename: Martin
authors.initials: M
authors.lastname: Jansen