Spectroscopy of Eu³⁺ and Tb³⁺ pyridine- and pyrazine-2-carboxylates

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• 作者：V.F. Zolin ; V.I. Tsaryuk ; V.A. Kudryashova ; K.P. Zhuravlev ; P. Gawryszewska ; J. Legendziewicz ; R. Szostak
• 关键词：Eu³⁺ ; Tb³⁺ ; Excitation spectra ; Luminescence spectra ; Vibrational spectra ; Pyridine-2-carboxylate ; Pyrazine-2-carboxylate
• 刊名：Journal of Alloys and Compounds
• 出版年：2008
• 出版时间：28 February 2008
• 年：2008
• 卷：451
• 期：1-2
• 页码：149-152
• 全文大小：421 K

文摘

The luminescence excitation, luminescence and vibrational spectra of europium and terbium pyridine- and pyrazine-2-carboxylates were investigated. A special attention was paid to spectroscopic characterization of tetrakis-compounds, MLn(Lig)₄·H₂O, where M = NH₄, Na; Ln = Eu, Tb; Lig = pyridine-2-carboxylate and pyrazine-2-carboxylate anions. The features of the spectra indicated a decrease of the interaction of carboxylic groups and an increase of the donor–acceptor interaction of coordinated nitrogen atoms with the lanthanide ions in different tetrakis-salts in comparison with the tris-salts. This is accompanied by clear manifestation of the 4f–5d electronic transitions in the excitation spectra of terbium salts.