Eu(hfc)3

Eu(hfc)₃ is the metalloorganic compound with the formula Eu(C₁₄F₇O₂)₃. It is a structural analogue of Eufod but contains three heptafluoropropylhydroxymethylene)camphorate anions instead of heptafluoro-tert-butyl pentanedionates. It features an octahedral molecular geometry Eu(III) center. Like Eufod, it is used as a chemical shift reagent (CSR), to increase the dispersion of signals in NMR spectra, exploiting its Lewis acidity and paramagnetism.^[1]

Eu(hfc)3

Identifiers
CAS Number	34788-82-4
3D model (JSmol)	Interactive image
ChemSpider	4590284
ECHA InfoCard	100.047.452
EC Number	252-214-0
PubChem CID	5490150
CompTox Dashboard (EPA)	DTXSID10897307
InChI InChI=1S/3C14H15F7O2.Eu/c3*1-10(2)6-4-5-11(10,3)8(22)7(6)9(23)12(15,16)13(17,18)14(19,20)21;/h3*6,23H,4-5H2,1-3H3;/q;;;+3/p-3/b3*9-7-; Key: VGLKHVQPWGFXEG-NCJHBDPTSA-K
SMILES CC1(C2(C(=O)/C(=C(\[O-])/C(F)(F)C(F)(F)C(F)(F)F)/C1CC2)C)C.CC1(C2(C(=O)/C(=C(\[O-])/C(F)(F)C(F)(F)C(F)(F)F)/C1CC2)C)C.CC1(C2(C(=O)/C(=C(\[O-])/C(F)(F)C(F)(F)C(F)(F)F)/C1CC2)C)C.[Eu+3]
Properties
Chemical formula	C42H42EuF21O6
Molar mass	1193.722 g·mol−1
Appearance	yellow solid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Both Eufod and Eu(hfc)₃ are chiral, but unlike Eufod, Eu(hfc)₃ exists as a single enantiomer owing to chirality of its camphor-derived ligands. Consequently, Eu(hfc)₃ forms diastereomeric adduct with chiral Lewis bases. In this way, Eu(hfc)₃ can be useful for determining optical purity.

Reactions

Eu(hfc)₃ forms 1:2 adducts with hard Lewis bases:^[2]

Eu(hfc)₃ + 2 L ⇌ Eu(hfc)₃L₂

This reaction is highly reversible, as required for the complex to serve as a CSR.

Related reagents

• Europium tris[3-(trifluoromethylhydroxymethylene)-(+)-camphorate] is closely related to Eu(hfc)₃ but with CF₃ in place of C₃F₇.