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

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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 E_R, σ^* and 1-1/ε, and expressed by the following type of equation. S=A.e^<-B×k>, k=ΔΔ E_R, σ^* or 1-1/ε 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 E_<steric>, Δ E_<elect>, and Δ E_<solv>.
公益社団法人日本薬学会の論文
1975-09-25