Quadrupolaufspaltung und Isomerieverschiebung der 14,4 keV γ-Linie von Fe57 in metall-organischen Eisenverbindungen

The Mößbauer absorption of the 14.4 keVγ-ray of Fe⁵⁷ was investigated in Ferrocene, Fe(C₅H₅)₂, and in a Ferriciniumcation [Fe(C H₅)₂]BF₄. The resonance absorption spectra reveal a quadrupole splitting and an isomeric shift of the 14.4 keV level in both compounds. The data give some evidence of the occupation of the molecular orbits formed in these complexes.     

Theory of NMR shifts and endor spectroscopy in paramagnetic complexes: (H. Eicher,Chem. Phys. 86 (1984) 331)

The nuclear-spin-electron-orbit interaction term in the general hamiltonian for a paramagnetic complex is correctly derived.     

Die Reaktionen von Trithiazylchlorid mit Zirkoniumtetrachlorid Die Kristallstruktur von (S4N4CI)2[Zr2CI10]

Reactions of Zirconium Tetrachloride with Trithiazylchloride. Crystal Structure of (S₄N₄)[Zr₂Cl₁₀] Zirconium tetrachloride reacts with (NSCI)₃ yielding (S₃N₃CI₂)₂[Zr₂CI₁₀], S₄N₄[Zr₂CI₁₀], or (S₄N₄CI)₂[Zr₂CI₁₀], depending of the reaction conditions. These compounds were characterized by their i.r. spectra. They have an ionic structure containing the known ions S₃N₃CI₂⊕, S₄N₄^2⊕, S₄N₄CI^⊕, and the thus far unknown [Zr₂CI₁₀]^2? ion. According to the X-ray structure determination (2827 independent observed reflexions, R = 0.027), (S₄N₄CI)₂[Zr₂CI₁₀] crystallizes in the space group P&1macr; with the lattice constants a = 688, b = 1132, c = 1827 pm, α = 103.2°, β = 98.7° and γ = 91.9⁰ and with Z = 2 formula units per unit cell. The structure is built up from S₄N₄CI^⊕ ions, which are nearly identical as in S₄N₄CI[FeCI₄] and from [Zr₂CI₁₀]^2? ions in which two chloro bridges join two edge-sharing octahedra.     

Kernmomente und Isomerieverschiebung kurzlebiger Kernniveaus bei der Resonanzstreuung

With the help of an exact inversion formula for the dispersion relation the proton form factor is calculated for the whole timelike region of momentum transfer till 7 (GeV)² with an accuracy of at least 50%. The essential features (extrema and zeros) can even be given within 25%. Thep-resonance can be seen at the correct position but there is no marked vector-meson-dominance.     

Zur reaktionsweise des 3-ethoxy-1,2-diphenyl-cyclopropenyliumkations mit bifunktionellen aromatischen aminen

The reaction of 3-ethoxy-1,2-diphenyl cyclopropenylium cation with bifunctional aromatic amines is described, which gives rise to benzazoles in an unexpected expansion mode of the cyclopropenone system.