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

Volume 26, Number 2 (April 1972) Page 251-256

Lee, Hsien-Yu; Cleveland, Forrest F.; Ziomek, Joseph S.; Jarke, Frank

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.