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

Authors: Lee, Hsien-Yu1; Cleveland, Forrest F.1; Ziomek, Joseph S.1; Jarke, Frank2

Source: Applied Spectroscopy, Volume 26, Issue 2, Pages 173-315 (March/April 1972) , pp. 251-256(6)

Publisher: Society for Applied Spectroscopy

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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: Infrared spectra; Raman spectra; Rare earth complexes

Document Type: Research Article


Affiliations: 1: Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616 2: IIT Research Institute, Chicago, Illinois 60616

Publication date: March 1, 1972

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