Crystal Structure of the Protonated Germanide Cluster [HGe9]3−

A single crystal X-ray diffraction study of the new compound [Rb([2.2.2]crypt)]2[Rb([18]crown−6)][HGe9]·4NH3 revealed the presence of the first protonated nine-atom germanide cluster [HGe9]3−. It forms from Rb4Ge9 in liquid ammonia, so that [Ge9]4− can be considered as the base and [HGe9]3− its formally conjugated acid. The H atom is attached to a germanium vertex atom of the basal square plane, as it is known for [RGe9]3− (R = C5H9, Mes, etc.) or [HE9]3− (E = Si, Sn). In addition, the proton could be located unambiguously in the Fourier difference map. [HGe9]3− also represents a nido cluster species with 22 cluster-bonding electrons, which can be considered the most stable structure for nine-atom cluster species for all group 14 elements.

New insight into the structure of the C60Sc20 cluster: bonding, vibrational and optical properties

In this communication a systematic study of bonding, IR, Raman and absorption spectra has been carried out for a new stable C60Sc20 cluster.

Nanostructural Fluctuation in Radiation-Amorphized Alloys

ABSTRACTSpatio-temporal nanostructural fluctuations brought about by transient, metastable atom-cluster formation and the manifold nature of inherent atomic ordering in electron-irradiation-amorphized NiTi were investigated by using a combination of in situ observations inside a high-resolution high-voltage electron microscope (HR-HVEM) and image analyses of molecular-dynamics-simulated atom configurations. Nanometer-sized clusters were found to appear and disappear in the irradiated region. The random formation and annihilation of such nanoclusters are believed to be responsible for nanostructural fluctuations which appear to be related to transitions among manifold inherent structural states, involving multirelaxation processes. Temporal fluctuations in the amorphized structure were manifested through the dose-dependent local amorphization parameter, potential energy, volume, and inherent cluster bonding. The observed fluctuations obey a universal power law. Within the framework of the multi-Lorentzian picture, the resultant power law describes the distribution of multirelaxation times or cluster lifetimes. In addition, a unified relation for the temporal autocorrelation function for such fluctuation phenomena has been determined.

Cluster Chemistry. XCIX. An Unusual Hydrocarbon-Cluster Bonding Mode in Ru3(μ3-2η1,2η3-C14H17Me)(μ-CO)(CO)7, Obtained From Ru3(CO)12 and 1,5,9-Trimethylcyclododeca-1,5,9-triene

A reaction between Ru3(CO)12 and 1,5,9-trimethylcyclododeca-1,5,9-triene has given the orange-red complex Ru3(μ3-2η1,2η3-C14H17Me)(μ-CO)(CO)7, fully characterized by a single- crystal X-ray study. The hydrocarbon is attached to an irregular closed Ru3 cluster by two Ru -C σ-bonds and two η3-allylic systems, the latter involving exocyclic CH2 and CH groups. The preparation of Ru3(μ-H)(μ3-C12H15)(μ- dppm )(CO)7 is also reported.