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Differential Thermal Analysis of Some Tervalent Metal Chelates of 1,5-Dialkylpentane-2,4-dionates

1974; Oxford University Press; Volume: 47; Issue: 9 Linguagem: Inglês

10.1246/bcsj.47.2203

1348-0634

Isao Yoshida, Hiroshi Kobayashi, Keihei Ueno,

Chemical Thermodynamics and Molecular Structure

In connection with the purification of metal chelates by zone refining, thermal properties of the following β-diketone chelates of tervalent cobalt(III), aluminum(III), iron(III), manganese(III), and chromium(III) were investigated by differential thermal analysis (DTA). The β-diketones used in this study were heptane-3,5-dione, nonane-4,6-dione, 2,6-dimethylheptane-3,5-dione, 2,8-dimethylnonane-4,6-dione, 2,2,6,6-tetramethylheptane-3,5-dione, and tridecane-6,8-dione. Metal chelates of the alkyl substituted pentane-2,4-diones showed a lower melting- and higher decomposition temperature in comparison with the pentane-2,4-dionates. Discussion is given on the effects due to the structures of the alkyl substituents upon thermal properties of the hexacoordinate metal chelates.