Abstract
The Raman spectra of La-, Pr-, and Gd (DPM)<sub>3</sub> [Gd-tris-2,2,6,6-tetramethyl-3,5-heptanedionate] were measured at 300°K with powder samples in the region 3000–100 cm<sup>−1</sup>. An attempt also was made to obtain the Raman spectra of La-, Ce-, Pr-, Nd-, and Gd(DPM)<sub>3</sub> 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)<sub>3</sub> in carbon tetrachloride solution by exposure to the light. The infrared spectra of La-, Ce-, Pr-, Nd-, and Gd(DPM)<sub>3</sub> were obtained in the region 4000-300 cm<sup>−1</sup> by the KBr disk method at 300°K. For La-, Nd-, and Gd (DPM)<sub>3</sub>, the absorption spectra were measured in the far-infrared region (660–76 cm<sup>−1</sup>) 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.
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