ISSN:
1572-901X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Summary Magnetic and spectral data are reported for the complexes Ln(RCO=CHCOCF3)3 ·nH 2O (Ln=lanthanide; R=p BrC6H4,m-MeC6H4,o-MeC6H4, Bu-t; n=2 or 3). An x-ray crystal structure determination of Er(m-MeC6H4CO=CH-COCF3)3 · 3 H2O showed that the complex is eight-coordinate with three bidentate β-diketonato and two aquo ligands; the third water molecule is hydrogen-bonded to one of the coordinated water molecules. The configuration about the erbium atom approximates to a square antiprism. The magnetic moments of the samarium and europium chelates are temperature-dependent, whereas those of the other paramagnetic lanthanides obey the Curie-Weiss law. The visible spectra of the chelates of Pr, Nd, Sin, Eu, Tb, Dy, Ho, Er, and Tm display line-like absorption bands typical of lanthanide ions. Hypersensitive transitions were observed for Nd, Sm, Eu, Dy, Ho, and Er.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00624791
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