Thermal and Spectroscopic Properties of Al, Ga and In Complexes with 1-Phenyl-3-methyl-4-propionyl-5-pyrazolone.

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The complexes of Al, Ga and In with 1-phenyl-3-methyl-4-propionyl-5-pyrazolone (C3) have been synthesized and characterized by elemental, thermal and IR spectroscopic analyses. The analytical data show that the metal ions reacted with the ligand in the metal:ligand mole ratio of 1:3.On the basis of the decomposition temperatures, the following sequence of stability of these complexes have been proposed: In(C3)3 < Ga(C3)3 < Al(C3)3. The thermal stability of the complexes increases with decreasing ionic radius of central metals. The two endotherms observed in each DSC curve of Al(C3)3 and In(C3)3 are due to the melting reaction of the complexes, which probably exist as a mixture of geometrical isomers.The peaks observed at about 1600cm-1 and 1490cm-1 in the IR spectra of the complexes are attributed to vas C=O and vas C=C of the chelate ring, respectively. The small ionic radius of the central metal of the complex shifts the C=O and C=C stretching bands to higher frequencies.
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