title: Cage compounds of heterotrimetallic mixed phosphanediide/silanolate aggregates with an alkaline Earth metal-centered phosphorus octahedron.
abstract: The lithiation of potassium triisopropylsilylphosphanide yields the corresponding phosphanediide. The subsequent metathesis reaction with SrI(2) and BaI(2) in the presence of hexamethyldisiloxane gives hexalithium hexapotassium strontium hexakis(triisopropylsilylphosphanediide)bis(trimethylsilanolate) (1) and the corresponding barium derivative (2), respectively. The alkaline earth metal atoms are surrounded octahedrally by the phosphanediide ligands. Six P(3) faces of the octahedron are capped by the K atoms, and the P-P edges of two opposite P(3) faces are bridged by the lithium atoms. The Li cations are also bonded to the Me(3)SiO substituents giving a coordination number of three for the alkali metals.
authors.affiliation: Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 9, Germany. maw@cup.uni-muenchen.de
authors.forename: Matthias
authors.initials: M
authors.lastname: Westerhausen
authors.forename: Sabine
authors.initials: S
authors.lastname: Weinrich
authors.forename: Gernot
authors.initials: G
authors.lastname: Kramer
authors.forename: Holger
authors.initials: H
authors.lastname: Piotrowski