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Resonance Raman spectra have been determined at -6O'C for a series of complexes of the general form [(L)(D2H2)Co02Co(D2H,)(L)], where D is the dianion of dimethylglyoxime and L is pyridine, (C,H,),N, (CH,),S, (C&)3P, (C6H5),As and (C,H,),Sb, these ligands being coordinated trans-axially to the dioxygen. The spectra show bands in the region 810-835 cm-' which are assigned to the u ( 0 -0 ) mode and the ~( C O -0 ) mode is assigned in the region 550-575 cm-l. The effect on the observed v ( 0 -0 ) wavenumber of changing the ligand L shows how u-and .rr-donor effects of the ligands are transmitted through the metal. The v ( 0 -0 ) band intensity excitation profile demonstrates that the 02-+ Co3+ CT transition is to be assigned at 550 nm. Comparison between the nature of the cobalt-oxygen binding in the oxime and those of the cyanide and salen systems are discussed.

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