Lanthanide chelates of fluorinated β-diketones. Part III. Mass spectra of lanthanide chelates of five fluorinated β-diketones |
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Authors: | Andrew M Hamer Stanley E Livingstone |
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Institution: | (1) School of Chemistry, University of New South Wales, 2033 Kensington, N.S.W., Australia |
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Abstract: | Summary The mass spectra of sixty lanthanide chelates of the fluorinated -diketones RC(OH)=CHCOCF3 (R=2-theonyl,p-BrC6H4,m-MeC6H4,o-MeC6H4, and Bu-t) have been obtained. The mass spectra were essentially similar, in contrast to those found ford-block transition metal chelates. Valency change from 3 to 2 occurred with samarium (4f
5), europium (4f
6), thulium (4f
12), and ytterbium (4f
13); the intensity of the Met(II)-containing peaks varied: Eu Sm > Yb > Tm, reflecting the decreasing tendency of these lanthanides to display bivalency. Valency change from 4 to 3 was observed with cerium (4f1) but not with terbium (4f8).Part II,Transition Met. Chem., 9, 423 (1984). |
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