Synthese und Untersuchung von kohlenstoff‐ und stickstoffzentrierten (Z) trigonal‐prismatischen Wolframclustern des Formeltyps A[W6ZCl18]

Synthesis and Characterization of Carbon‐ and Nitrogen‐Centered (Z) Trigonal Prismatic Tungsten Clusters of the Formula Type A[W₆ZCl₁₈] Solid state reactions of tungsten(IV) chloride and carbodiimides (cyanamides) of lithium, sodium, calcium and silver yielded black crystalline powders of centered (Z) trigonal‐prismatic tungsten cluster compounds having the general formula A[W₆ZCl₁₈] with A = Li, Na, Ca, Ag and Z = C, N. Crystal structures of the corresponding compounds were investigated by powder and single‐crystal X‐ray diffraction. The nature of the central atom was studied by mass spectrometry and nuclear magnetic resonance spectrometry. It turned out that the central atom can be C (in the case of the lithium and sodium compound) or N (in the case of the sodium and calcium compound).     

Hunting for the Magnesium(I) Species: Formation, Structure, and Reactivity of some Donor-Free Grignard Compounds

Magnesium bromide radicals have to be prepared as high-temperature molecules and trapped as a metastable solution because a seemingly simple reduction of donor-free Grignard compounds failed. However, the essential role of magnesium(I) species during the formation of Grignard compounds could be demonstrated experimentally.