The two geometrical isomers of tris(2,2-dimethyl-3,5-hexanedionato)cobalt (111) have been prepared, separated chromatographically, and identified by proton magnetic resonance (pmr) spectroscopy. The pmr of a series of bis(acety1acetonato)diaminecobalt(II1) complexes (diamine = ethylenediamine, N,N,N',N'-tetramethylethylenediamine, 2,2'-bipyridine, or 1,lO-phenanthroline) show the importance of both diamagnetic ring anisotropy and external environmental effects. Marked improvements have been made in the synthesis of tris(2,2,6,6-tetramethyl-3,6-heptanedionato)cobalt~III) and tris(l,l,l,5,5,5hexafluoroacetylacetonato)cobalt(III). Electronic and vibrational energy levels are also discussed.
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