Between Localization and Delocalization: Ru(cod)2+ Units in the Zintl Clusters [Bi9{Ru(cod)}2]3− and [Tl2Bi6{Ru(cod)}]2−

Reactions of [K(crypt‐222)]₂(TlBi₃)⋅0.5 en ( 1 b ) with [Ru(cod)(H₂CC(Me)CH₂)₂] ( A ) in 1,2‐diaminoethane (en) led to the formation of two compounds with new bismuth‐rich cluster anions, [K(crypt‐222)]₃[Bi₉{Ru(cod)}₂]⋅1.5 en ( 2 ) and [K(crypt‐222)]₂[Tl₂Bi₆{Ru(cod)}]⋅2 tol ( 3 ), alongside the salt of a binary nido cluster, [K(crypt‐222)]₃(Tl₄Bi₅)⋅2 en ( 4 ). The anions in 2 and 3 are two further examples of rare heterometallic clusters containing Ru atoms. As one cod ligand is retained on each Ru atom in both clusters, the anions may be viewed as intermediates on the way towards larger, ligand‐free intermetalloid clusters. Quantum‐chemical studies provided insight into the bonding situation in these clusters. According to these studies, the anion of 2 features both electron‐precise and electron‐deficient parts. Electrospray ionization mass spectrometry analysis indicated that the clusters undergo stepwise fragmentation.     

Effects of the primary recoil spectrum on long-range migration of defects

Abstract

For quantitative predictions and comparisons of microstructures that evolve during exposure to different radiation environments at elevated temperature one needs to develop methods that go beyond those based on the number of displacements per atom. The number of freely migrating defects that contribute to the microstructural development is far less than the total number of defects produced, as has been recognized for some time from measurements of radiation-induced segregation and of radiation-enhanced diffusion. Defect production in various neutron and ion irradiation environments is discussed in light of this fact. A method to calculate the fraction of freely migrating defects from the cluster size distribution of defects produced in cascades is suggested. The results are in good agreement with available data.     

Metalloid Cluster Compounds of Group 14: Bonding Properties and Subsequent Reactions

Abstract

Metalloid cluster compounds of group 14 of the general formulae E_nR_m with n > m (E = Si, Ge, Sn, Pb; R = ligand), where naked as well as ligand bound tetrel atoms are present, represent a novel class of cluster compounds in group 14 chemistry and can be seen as intermediates on the way to the elemental state. Therefore, interesting properties are expected for these compounds, which might complement results from nanotechnology. In this article, first results for germanium are discussed, together with novel build-up reactions on the way to novel materials based on metalloid cluster compounds.

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