title: Sn3I8 x 2 (18-crown-6): a mixed-valent tin-crown-ether complex.
abstract: By reaction of SnI(2), SnI(4), and crown ether (18-crown-6) in the ionic liquid [NMe(n-Bu)(3)][N(Tf)(2)], Sn(3)I(8) x 2 (18-crown-6) is obtained in the form of black, plate-shaped crystals and crystallizes with a monoclinic lattice symmetry. In detail, Sn(3)I(8) x 2 (18-crown-6) is constituted of trigonal-bipyramidal [SnI(5)](-)-anions and [Sn(2)I(3)(18-crown-6)(2)](+)-cations. The cation exhibits an endocyclical coordination of Sn(2+) by the crown ether. Both constituents are linked via long-ranging I-I contacts to form an infinite network. Besides crystal structure analysis, the mixed valence state of tin is evidenced by (119)Sn-Mössbauer spectroscopy.
authors.affiliation: Institut für Anorganische Chemie, Universität Karlsruhe (TH), Engesserstrasse 15, D-76131 Karlsruhe, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Wolff
authors.forename: Thomas
authors.initials: T
authors.lastname: Harmening
authors.forename: Rainer
authors.initials: R
authors.lastname: Pöttgen
authors.forename: Claus
authors.initials: C
authors.lastname: Feldmann