The infrared absorption spectra of metal acetylacetonates

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Abstract

Infrared absorption data in the region 5000–290 cm−1 have been obtained for twenty-four metal derivatives of acetylacetone. Shifts in the absorption maxima as the metal ion is varied are more pronounced at frequencies lower than 600 cm−1. Among the factors which appear to influence the changes in observed spectra are: (1) crystal structure; (2) ionization potential, ionic charge, mass and radius of the metal; (3) participation of inner orbitals in the metal-ligand bonding; and (4) covalent bonding. Spectral features which are consistent with ligand field theory are discussed.

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