Abstract
The 13C-NMR lanthanoid-induced shifts of antipyrine by tris-(1, 1, 1, 2, 2, 3, 3-heptafluoro7, 7-dimethyl-4, 6-octanedionato) praseodymium were analyzed using a modified ApSimonBeierbeck method. Contributions of the contact and complex-formation terms were found to be significant as well as the pseudo-contact term, when it was assumed that the contact term was proportional to the carbon 2S orbital spin density of the antipyrine cation radical in the INDO MO calculation and that the complex-formation term contributed only to the 5-position carbon of antipyrine.
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