Studies on the proton magnetic resonance spectra in aromatic systems. XX. Major factors of the paramagnetic shift parameter of alkyl pyridine derivatives by tris (dipivalomethanato)europium.

1975 
The induced paramagnetic shift parameters, S values, due to tris (dipivalomethanato)-europium were examined in alkyl pyridine derivatives from the view points of steric, electronic and solvent effects. 1. The log S values are linearly related with ΔΔ ER, σ* and 1-1/e, and expressed by the following type of equation. S=A.e-B×k, k=ΔΔ ER, σ* or 1-1/e 2. The three kinds of intercepts are linearly related with each other and decrease regularly from α to γ, whereas a plot of three kinds of slopes, referring to the perturbed state is zig-zag. 3. The S values are expressed by the sum of the contributions of Δ Esteric, Δ Eelect, and Δ Esolv.
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