Eu(hfc)3


'Eucamphorate anions instead of heptafluoro-tert''-butyl pentanedionates. It features an octahedral molecular geometry Eu center. Like Eufod, it is used as a chemical shift reagent, to increase the dispersion of signals in NMR spectra, exploiting its Lewis acidity and paramagnetism.
Both Eufod and Eu3 are chiral, but unlike Eufod, Eu3 exists as a single enantiomer owing to chirality of its camphor-derived ligands. Consequently, Eu3 forms diastereomeric adduct with chiral Lewis bases. In this way, Eu3 can be useful for determining optical purity.

Reactions

Eu3 forms 1:2 adducts with hard Lewis bases:
This reaction is highly reversible, as required for the complex to serve as a CSR.

Related reagents

  • Europium tris is closely related to Eu3 but with.