Vibrational Spectra of Several Lanthanide Tris-2,2,6,6-tetramethyl-3,5-heptanedionates

Abstract

The Raman spectra of La-, Pr-, and Gd(DPM)₃ [Gd-tris-2,2,6,6-tetramethyl-3,5-heptanedionate] were measured at 300°K with powder samples in the region 3000–100 cm⁻¹. An attempt also was made to obtain the Raman spectra of La-, Ce-, Pr-, Nd-, and Gd(DPM)₃ in carbon tetrachloride solution, but no Raman lines for these compounds were found. The undisplaced mercury lines observed were unusually strong. This may have been caused by the photodecomposition of M (DPM)₃ in carbon tetrachloride solution by exposure to the light. The infrared spectra of La-, Ce-, Pr-, Nd-, and Gd(DPM)₃ were obtained in the region 4000–300 cm⁻¹ by the KBr disk method at 300°K. For La-, Nd-, and Gd(DPM)₃, the absorption spectra were measured in the far-infrared region (660–76 cm⁻¹) by use of the polyethylene disk method at 300 and 77 °K. Assignments of the vibrational frequencies were made on the bases of the group theory selection rules and group frequencies, and these were compared with the known assignments of tris-(acetylacetonato) lanthanide (III) complexes for most of the bands.

Keywords

Rare earth complexes Raman spectra Infrared spectra

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