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X-ray diffraction, IR spectroscopy, and thermogravimetry and analyses of the composition of platinum carbonyl destruction products showed that oligomeric platinum carbonyl [Pt(CO)2]n is unstable in the air at room temperature and quickly decomposes with the loss of CO ligands due to their removal from the complex as a result of CO dissociation and CO ligand oxidation by atmospheric oxygen. The destruction processes of platinum carbonyl [Pt(CO)2]n and the composition of destruction products were described.

Carbonyl palladium blacks are formed on treatment of Pd(II) chloride complex in a solution with carbon monoxide at ambient pressure and a temperature ≥20°C. The results of IR spectroscopy, powder X-ray diffraction, and electron microscopy demonstrated that carbonyl palladium blacks are heterogeneous unstable systems consisting of palladium, carbon, and oxygen, the ratio of which changes upon heat treatment. Palladium is present as the metal, the carbonyl cluster Pdx(CO)y, and the variable-composition PdCx phase, while carbon partly occurs as amorphous diamond with sp3 hybridization of atoms. After calcination of Pd black at 1000°C, a large amount of carbon remains in the resulting Pd sponge, which acquires abrasive properties. Dissolution of the sponge in aqua regia leaves a solid phase with a high carbon content