Oxidative Coupling of [Ge(Si(SiMe))] with f Elements.

We report the reactions of K[Ge(Hyp)] (Hyp = Si(SiMe)) with (thf)YbI, ThI, and UCl, leading to the oxidative coupling of the metalloid germanium cluster to form the dimeric dianion [Ge(Hyp)]. The novel dimerized Ge-cluster was isolated and characterized by single-crystal X-ray diffraction analysis as a component of ionic compounds [Yb(thf)][Ge(Hyp)] () and [K(2.2.

Substitution of Hyp (Hyp = Si(SiMe)) at metalloid [Ge(Hyp)] clusters using phosphine stabilized Au(I)Cl.

We present two new intermetalloid cluster compounds [(BuP)AuGe(Hyp)Au(PBu)] (1) and [Au(iPrPOCHOPiPr)AuGe(Hyp)] (2) which are obtained from the reaction of KGe(Hyp) (Hyp = Si(SiMe)) with the respective Au(I) phosphine precursors. The products are characterized X-ray crystal structure analysis and the reaction course is analysed NMR spectroscopy. We also show that in the resulting compound 1 the hypersilyl substituents can be reintroduced the reaction with Hyp-Cl to obtain BuPAuGe(Hyp).

Photoexcitation of Ge Clusters in THF: New Insights into the Ultrafast Relaxation Dynamics and the Influence of the Cation.

We present a comprehensive femtosecond (fs) transient absorption study of the [Ge(Hyp)] (Hyp = Si(SiMe)) cluster solvated in tetrahydrofuran (THF) with special emphasis on intra- and intermolecular charge transfer mechanisms which can be tuned by exchange of the counterion and by dimerization of the cluster. The examination of the visible and the near infrared (NIR) spectral range reveals four different processes of cluster dynamics after UV (267/258 nm) photoexcitation related to charge transfer to solvent and localized excited states in the cluster. The resulting transient absorption is mainly observed in the NIR region.

The influence of the FeCp(CO) moiety on the dynamics of the metalloid [Ge(Si(SiMe))] cluster in thf: synthesis and characterization by time-resolved absorption spectroscopy.

A neutral tetrasubstituted Ge cluster with a covalently bound transition metal substituent was synthesized successfully via a salt metathesis reaction. Photoexcitation of [Ge(Si(SiMe))FeCp(CO)] induces excited state dynamics of the compound that was analysed by extended broadband fs absorption spectroscopy in the UV-Vis-NIR region. After UV or Vis excitation, an electron is detached from the [Ge(Si(SiMe))]-entity and localizes within few hundred fs.