title: The layered structure of [Na(NH3)4][Indenide] containing a square-planar Na(NH3)4(+) cation.
abstract: It's hip to be a square! The ammines [Li(NH(3))(4)][Ind] and [Na(NH(3))(4)][Ind] both contain a cation coordinated by four ammonia molecules. Whereas the first shows the anticipated tetrahedral coordination, in the second the metal coordination is unexpectedly square-planar. The solvent-separated ion pair forms a rippled layer structure of alternating planar Na(NH(3))(4)(+) cations and indenyl carbanions that is attributed to NH(3) ⋅⋅⋅π hydrogen bonds.
authors.affiliation: Institut für Anorganische Chemie der Universität Göttingen, Germany.
authors.forename: Reent
authors.initials: R
authors.lastname: Michel
authors.forename: Tobias
authors.initials: T
authors.lastname: Nack
authors.forename: Roman
authors.initials: R
authors.lastname: Neufeld
authors.forename: Johannes M
authors.initials: JM
authors.lastname: Dieterich
authors.forename: Ricardo A
authors.initials: RA
authors.lastname: Mata
authors.forename: Dietmar
authors.initials: D
authors.lastname: Stalke