Although intensive efforts have been devoted during recent years to prepare and characterize metal-bound C02 complexes in conjunction with C02 fixation via reactions with transition-metal systems,2 only a few metal-coordinated C02 complexes have been isolated and crystallographically ascertained.3"6 These include a novel d6 Ir(III) IrCl(C204)(PMe3)3 product6 in which the C204 ligand has been formed from a head-to-tail 02C-0C0 dimerization of C02 by initial reaction with a d8 Ir(I) complex. On the other hand, the more reactive, related cumulene (or heteroallene) carbon disulfide has been shown from structural studies2,7,8 to

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