title: Formation of a donor-stabilized tetrasilacyclobutadiene dication by a Lewis acid assisted reaction of an N-heterocyclic chloro silylene.
abstract: The first donor-stabilized tetrasilacyclobutadiene dication species has been synthesized and fully characterized. Its unexpected formation occurs by the Lewis acid assisted reaction of the N-heterocyclic chloro silylene [L(Si:)Cl] (L = PhC(NtBu)(2); amidinate) with Cp*ZrCl(3) (Cp* = pentamethylcyclopentadienyl) in the molar ratio of 3:2. Remarkably, the four-membered Si(4) core consists of two N-donor stabilized silylium subunits and two silylene-like moieties. The dicationic charge is somewhat delocalized on the Si(4) core, which is supported by DFT calculations.
authors.affiliation: Institute of Chemistry: Metalorganics and Inorganic Materials, Technische Universität Berlin, Strasse des 17, Juni 135, Sekr. C2, D-10623 Berlin, Germany. shigeyoshi.inoue@tu-berlin.de
authors.forename: Shigeyoshi
authors.initials: S
authors.lastname: Inoue
authors.forename: Jan D
authors.initials: JD
authors.lastname: Epping
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Irran
authors.forename: Matthias
authors.initials: M
authors.lastname: Driess