Abstract
Labile complexes of Pr, Nd, Eu, Dy, Ho, and Yb cations with L-camosine (β-ala-nylhistidine) have been investigated by NMR in aqueous acidic solution. Paramagnetic bound shifts ( Δ 2) values for all proton resonances have been deduced and in the case of CH 2N and CH 2C protons where no contact shift is observed, isomorphous replacement and effective axial symmetry is confirmed for the Ln 3+ series. For contact shifted nuclei, the separation of contact and pseudo-contact terms has been effected by the use of computed Δ 2 values. From these results it appears that the hyperfine coupling constant ( A i ) cannot be kept identical throughout the lanthanide elements for isostructural complexes.
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