Abstract

High-resolution emission spectra of several europium complexes with β-diketones, dipyridyl, and phenanthroline have been examined at 77°K in microcrystals. The Stark splitting of the <sup>7</sup><i>F</i> levels in the ground multiplet and the relative intensities of the individual <sup>5</sup><i>D</i><sub>0</sub>→<sup>7</sup><i>F</i> transitions can be used for theoretical correlation with the ligand field parameters, transition probabilities, molecular structure, and Eu-ligand bonding. The fluorescence spectra of the bis-aqua, tris, tris-aqua, tetrakis, and mixed chelates with the bidentate ligands are discussed in relation to molecular configuration.

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