The interaction of palladium(I1) nitrate with acetic and propionic acids produces the brown carboxylates Pd(OCOR)2 ; the benzoate, trifluoroacetate, and pentafluoropropionate are obtained via exchange reactions. Although the fluoro-carboxylates are monomeric, the other compounds are trimers in solution a t 37".The interaction of the carboxylates with various amines, triphenylphosphine and triphenylarsine gives complexes of the type trans-[Pd (OCOR) 2L2) with unidentate carboxylate groups. Diacetatoplatinum(11) was obtained by the reduction of an acetic acid solution of hexahydroxyplatinate(1v) with formic acid. It is trimeric, not isomorphous with [Pd(OCOMe)2),, and does not undergo cleavage reactions with donor ligands. Studies on rhodium(I1) carboxylates have been confirmed and extended. Palladhim CarboxyZates.-Diacetatopalladium(I1) can be obtained as brown crystals from the interaction of slightly acid solutions of palladium(11) nitrate with glacial acetic acid, or by dissolving palladium sponge suspended in hot glacial acetic acid, by the addition of the minimum quantity of nitric acid. The propionate can be made directly in the same way, while the benzoate, trifluoroacetate, and pentafluoropropionate can be obtained from the acetate by exchange reactions.

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The crystal and molecular structure of the compound BaMo04(C204)2 • 5H20 has been determined by a single crystal X-ray diffraction study. It is found to contain a binuclear anion, {[MoO(C204)H20]202}2-, oxalatooxoaquomolybdenum(V)-µdioxo-oxalatooxoaquomolybdenum(V). The idealized structure consists of two octahedrally coordinated molybdenum atoms sharing an edge. The two halves are related by a (crystallographic) twofold rotation axis passing through the center of the MoMo ring. The Mo-Mo distance of only 2.541 Á. suggests that the diamagnetism of the compound is due to an Mo-Mo bond.(5) W. G. Sly, D. P. Shoemaker, and J. H. Van den Hende, "I.B.M. 709/ 7090 Fourier Program, '' 1962.

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