STUDIES ON COMPLEXES OF ARYLAZOOXIMES .2. SOME RHODIUM(III) AND PALLADIUM(II) CHELATES

Syntheses of several tris (arylazooximato)rhodium (III) complexes are described. They can be separated into stable cis and trans isomers by chromatography on alumina. Unusually high yields of the cis form are observed in some cases. The isomers were identified by their pmr spectra. Arylazooximes react with potassium tetrachloropalladate(II) to form chlorinebridged dinuclear complexes. A few reactions of these compounds are described. The dipole moment of a typical palladium(II) complex was found to be too high for a symmetrical trans structure. Infrared data imply the presence of fivemembered chelate rings in both rhodium(III) and palladium(II) complexes. A well-defined electronic band is observed for these complexes in the visible region. This is assigned to a metal perturbed ligand transition. The unusual “bis” chelates of palladium and platinum are briefly introduced. © 1969, American Chemical Society. All rights reserved.