Vibrational Spectra of Anhydrous Lanthanum, Europium, Gadolinium, and Dysprosium Nitrates and Oxinitrates
✍ Scribed by Jean-Claude G. Bünzli; Etienne Moret; Jean-Robert Yersin
- Publisher
- John Wiley and Sons
- Year
- 1978
- Tongue
- German
- Weight
- 526 KB
- Volume
- 61
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
IR. and Raman spectra of LnONO, (50-4,000 cm-.', Ln=La, Gd, Eu, and Dy) are reported and discussed. The low frequency region of the spectra reflects the cubic structure of these compounds. The dimensions of the cubic unit cells determined by X-Ray powder diagrams are: 12.8 1 f 0.05 A for EuONO,, 12.69 f 0.05 A for GdON03, and 12.67 -t 0.05 A for DyONO,. The vibrational frequencies of the nitrato group are consistent with a bidentate nitrate of Cz,, symmetry. The synthesis of anhydrous Ln(N03)3 (Ln=La, Gd, Eu, and Dy) by dehydration of the corresponding penta-or hexahydrates is described. The IR. and Raman spectra (50-4,000 cm-') are analysed. Splitting of the bands point to a complex structure of these compounds. All six vibrational modes of the nitrato group are observed and the data are again consistent with bidentate NO; moi'eties. Finally, an analytical control of the purity of Ln (NO,), is suggested.