Abstract:
In this investigation on the reactivity of acetylacetone coordinated to some trivalent transition metal ions aquation, ligand exchange, and 018 exchange between the complexes and solvent water have been studied. In order to measure the rate of 018 exchange between complex and solvent a technique was developed and an apparatus constructed to obtain oxygen from organic compounds and coordination compounds as carbon dioxide far mass-spectrometric analysis. The compound is first pyrolysed on carbon at ~ 1000C to form a mixture of hydrocarbons and carbon monoxide. Carbon monoxide is then converted to carbon dioxide with the aid of a high voltage discharge. Three pyrolysers wore developed, for (a) Organic liquids (b) Readily-decomposed solids (c) Sublimable solids. Ligand exchange data for trisacetylacetoneiron(III) is consistent with the lability predicted on both Ligand Field and Valence Bond theories. The rate of 018 exchange between this complex and solvent water is about 40% the rate of 018 exchange between acetylacetone and water under the same conditions, which suggests that one acetylacetone molecule is freed by dissociation in solutions of pH 3~4 and that this free acetylacetone molecule undergoes exchange.