Summary
Magnetic and spectral data are reported for the complexes LnL3 · 2H2O (Ln = lanthanide; LH = 2-thenoyltrifluoroacetone). The magnetic moments of the samarium and europium complexes are strongly temperature-dependent. The values of μeff for the other lanthanide chelates are close to those reported for other corresponding lanthanide compounds. The values of the Weiss constant θ for LnL3 · 2H2O (Ln = Gd, Tb, Dy, Ho, Er or Tm) are quite small (< 12 K), while those for Ln = Ce, Pr, Nd or Yb range from 29–104 K. The visible spectra of the complexes LnL3 · 2H2O (Ln = Pr, Nd, Sm, Dy, Ho, Er, and Tm) display the usual line-like absorption bands; hypersensitive transitions of Nd, Ho, Er and Tm complexes were observed with extinction coefficients many times greater than those found for the aqueous ions.
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Hamer, A.M., Livingstone, S.E. The magnetic moments and electronic spectra of lanthanide chelates of 2-thenoyltrifluoroacetone. Transition Met Chem 8, 298–304 (1983). https://doi.org/10.1007/BF00620875
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DOI: https://doi.org/10.1007/BF00620875