Abstract
Several lanthanide chelates of the fluorochloroalkyl β-diketones Ln(CF_2ClCOCH COR)_3·nH_2O were prepared (2, Ln=Eu: 2a, R=C(CH_3)_3, n=0; 2b, R=C_6F_5, n=0; 2c, R=CF_2Cl, n=2. 3, Ln=Pr: 3a, R=C(CH_3)_3, n=0; 3b, R=C_6F_5, n=1; 3c, R=CF_2Cl, n=2.4, Ln=La, R=C_6H_5, n=0) and the NMR shift data of compounds 2 and 3 had been determined using alcohols, ether, ketones and amine as substrates. With alcohol, ether and ketone compounds 2 induce shifts similar to that induced by Eu(fod)_3. However due to the high solubility of the chelates in non-polar organic solvents such as CHCl_3 and CCl_4 and the absence of ~1H signal from compounds 2b, 2c, 3b and 3c, their application as a series of new NMR shift reagents seems promising.
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