title: Synthesis and unexpected reactivity of germyliumylidene hydride [:GeH]+ stabilized by a bis(N-heterocyclic carbene)borate ligand.
abstract: Employing the potassium salt of the monoanionic bis(NHC)borate 1 (NHC = N-Heterocyclic Carbene) enables the synthesis and isolation of the bis(NHC)borate-stabilized chlorogermyliumylidene precursor 2 in 61% yield. A Cl/H exchange reaction of 2 using potassium trisec.-butylborhydride as a hydride source leads to the isolation of the first germyliumylidene hydride [HGe:(+)] complex 3 in 91% yield. The Ge(II)-H bond in the latter compound has an unexpected reactivity as shown by the reaction with the potential hydride scavenger [Ph3C](+)[B(C6F5)4](-), furnishing the corresponding HGe: → CPh3 cation in the ion pair 4 as initial product. Compound 4 liberates HCPh3 in the presence of 3 to give the unusual dinuclear HGe: → Ge: cation in 5. The latter represents the first three-coordinate dicationic Ge(II) species stabilized by an anionic bis(NHC) chelate ligand and a Ge(II) donor. All novel compounds were fully characterized, including X-ray diffraction analyses.
authors: Institute of Chemistry: Metalorganics and Inorganic Materials, Technische Universität Berlin , Strasse des 17. Juni 135, Sekr. C2, D-10623 Berlin, Germany.
authors: Yun
authors: Y
authors: Xiong
authors: Tibor
authors: T
authors: Szilvási
authors: Shenglai
authors: S
authors: Yao
authors: Gengwen
authors: G
authors: Tan
authors: Matthias
authors: M
authors: Driess