The electronic spectra of a
series of six-coordinate octahedral tris-, bis-, and mono-bipyridyl complexes
of tervalent iron, ruthenium, and osmium have been recorded and spectral bands
assigned to intraligand and charge-transfer transitions. The tris-bipyridyl
complexes and bis- and mono-bipyridyl complexes containing other ligands such
as pyridine and cyanide show a metal reduction transition π(bipy) →
t2(metal). Bipyridyl complexes of osmium containing halide ligands
show a similar transition, but for the corresponding complexes of iron and
ruthenium the metal reduction transition is now X(halogen) → t2(metal),
the electron originating on the halide ligand. Bipyridyl-acetylacetonate
complexes have more complicated spectra. Trends in the spectral bands, for all
the complexes, indicate that of the three metal ions ruthenium probably forms
the strongest M→L π-interaction.
Spektrale Banden der Elektronenspektren der sechsfach‐koordinierten Komplexe (I)‐(IV) werden Intraligand‐ und Ladungsübertragungsübergängen zugeordnet.
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