Abstract
Rhodium(III) acetylacetonate was investigated for its physical, thermal and optical properties. Ultraviolet-visible absorption spectra show absorptions at 320 nm, 260 nm, and 210 nm. Density measurements yielded a value of 1.75 g/cm3. Thermal characteristics were evaluated using differential thermal analysis (DTA). It was found that the compound is not volatile, decomposing upon heating. If heating rates are rapid enough,e.g. > 2° C/min, melting at 267° C can be observed. If heating rates are slower, decomposition is complete below the melting point. If the compound is annealed at 267° C for four hours decomposition is complete, yielding 99% pure rhodium metal. In an oxidizing atmosphere, on the other hand, the compound decomposes into a product containing 75% rhodium metal which appears to be RhO2.
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