Mass spectra are presented of aluminum bromide clusters containing up to 30 atoms. Peaks in the mass spectra corresponding to [(AIBr,),]+ clusters are particularly strong for n equal to 2, 4, and 6. The structure and relative stability of neutral clusters were calculated by minimizing the total energy assuming purely ionic bonding. The calculations show enhanced stability for the (AIBr3)*,, species.The stability of clusters of metal monohalides, (MX),, has been studied extensively both e~perimentallyl-~ and t h e~r e t i c a l l y .~~~ These studies have shown that clusters with certain sizes are highly stable. Mass spectrometric experiments on alkali halide clusters formed by bombardment of a solid with high-energy rare gas ions and atoms have indicated that clusters with the composition [M14X,,]+ are particularly stable. Calculations have shown that this cluster is most likely a small cube having the local symmetry of an NaCl lattice. The [MI4Xl3]+ cluster is highly stable even for CsI.
Das Ribofuranosid (I) reagiert mit den Nitroalkanen (II) zu den Nitroalkoholen (III), die als diastereomere Gemische isoliert und chromatographisch getrennt werden.
In den Massenspektren von AI‐bromid‐Clustern mit bis zu 30 Atomen sind die den Clustern [(AlBr3)"] mit n: 2, 4 und 6 entsprechenden Peaks besonders stark.
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