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BINUCLEAR PEROXO COMPLEX COMPOUNDS OF COBALT 5 trichlorothorium ions. However, with additional data it has become apparent that while the monoand trichloro ions are the predominant chlorothorium species at all concentrations up to 4 M chloride the di-and tetrachlorothorium species are present in measurable concentration. Table I1 illustrates the relative importance, percentagewise, of the thorium species in 1, 2 and 4 M chloride solution at an ionic strength of four. = 0.00-1.96 M ; [H+] = 0.04 M ; [CIO-] = 0.04;-2.00A repetition of the preparative work of A. Werner and others confirmed the existence of a series of green binuclear peroso compounds containing a cobalt atom in the tetrapositive oxidation state. A second series of red com ounds which Werner, using the conce t of secondary valence forces formulated as isomers proved to be the one electron refuction products of the green series a n f contained only tripositive cobalt. Analytically, the red compounds a peared to be isomeric because, while they are only weakly basic in solution, they normally precipitate as acid salts and tgus differ from the green series by a single proton. The reported ''isomeric conversions" are in reality all oxidation-reduction reactions and include the bromidecatalyzed disproportionation of the red series and reduction of the green series by hydroxide ion.

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