AbstructThe syntheses of the iron(111), ruthenium(111), and osmium(111) complexes of dithioacetylacetone are described. The tris chelates are neutral low-spin (8 = 112) monomers. Polarography in acetone reveals a ready one-electron reduction for each complex. Infrared and e.s.r. spectra are reported. The magnetic susceptibilities have been measured as a function of temperature. The electronic absorption spectra are compared with those of the related oobaIt(111) group complexes, and some tentative assignments of charge transfer bands are provided.

The synthesis of the first dithioaoetylacetonate of a Group VI transition metal has been achieved by reduction of the 3,5-dimethyl-1,2-dithiolium cation with divalent chromium. The physical properties of the dark green monomer [Cr(SacSac)3] are reported.

A b s t r a c tThe novel dithioacetylacetonato complex [ R u ( C~H~S~)has been characterized by analytical and spectral methods. A trans configuration is suggested. The electronic spectrum is consistent with the oxidation state I1 for the coordinated metal ion.

.The syntheses of the cobalt(III), rhodium(III), and iridium(III) complexes of dithioacetylacetone, [M(SacSac)3], are described. The tris-chelates are neutral dia- magnetic monomers. Infrared, proton magnetic resonance, and electronic spectra are reported. Polarography in acetone shows that these complexes are reduced at more negative potentials than those of the iron(III) group. Various related complexes [Co(SacSac)2(X-Y)] have also been prepared.

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