title: The first crystallographic example of a face-sharing fluoroaluminate anion Al2F9(3-).
abstract: The first example of a face-sharing fluoroaluminate anion, Al(2)F(9)(3-), is crystallographically determined in [C(18)MIm](3)[Al(2)F(9)](CH(2)Cl(2))(1.754) (C(18)MIm(+) = 1-methyl-3-octadecylimidazolium cation), and the geometry and bond properties therein are discussed with the aid of quantum chemical calculations.
authors.affiliation: Graduate School of Energy Science, Kyoto University, Yoshida, Kyoto 606-8501, Japan.
authors.forename: Fei
authors.initials: F
authors.lastname: Xu
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Matsumoto
authors.forename: Rika
authors.initials: R
authors.lastname: Hagiwara