The preparation of Ln{CF3CF2[CF2OCF(CF3)]nCOCHCOC(CH3)3}3 [I; n = 1, 2; Ln = Eu, Pr, Nd, Sm, Gd, Tb, Dy, Er] is reported. The 1H NMR shift properties were studied using alcohol, ketone, ether and amine as substrates. I (Ln = Eu, Pr) induce shifts similar to those induced by LnL3 (Ln = Eu, Pr; HL = fod). However, I (Ln = Eu) are superior to EuL3, because their 1H signal shifts to higher field in the presence of substrate than that of EuL3 does. For example, dH for I (Ln = Eu) is close to 0 ppm in the presence of alcohol Very satisfactory 1st order spectra can be obtained using I (Ln = Eu, Pr) as 1H NMR shift reagents. I (Ln = Nd, Tb, Dy) produce upfield shifts, and I (Ln = Er) produce downfield shifts. I (Ln = Nd) induce shifts smaller than those of I (Ln = Pr) whereas I (Ln = Tb, Dy, Er) induce very large shifts.

Key words: INFRARED SPECTROPHOTOMETRY, PROTON MAGNETIC RESONANCE SPECTROMETRY, ORGANO FLUORINE COMPOUNDS, LANTHANUM COMPLEX, SHIFT REAGENT, BETA DIKETONES