Darstellung und Charakterisierung der Tetrabutylammoniumsalze der Tetrahalogenooxotechnetate(V), [TcOCl4]- und [TcOBr4]- / Preparation and Characterization of the Tetrabutylammonium Salts of the Tetrahalooxotechnetates(V), [TcOCl4]- and [TcOBr4]-

Abstract

The treatment of (TBA)TcO₄ with conc. HCl or HBr at room temperature yields (TBA)[TcOCl₄] or (TBA)[TcOBr₄], which are nearly insoluble in acidic aqueous solutions, but well soluble in organic solvents. The vibrational spectra indicate C_4v symmetry for the complex ions. (TBA)[TcOBr₄] shows an unusual resonance Raman effect, as the progression of overtones runs with the B₁ TcCL₄ stretching vibration instead of the symmetric A₁ mode. The coupling of B₁ with the first overtone of νTcO gives more intense difference than combination bands.