Fig. 1
1H NMR spectra of an aqueous solution of Yb3 (6.3 mM) (bottom) and upon addition of d-lactate (15 mM) and l-lactate (15 mM) to the Yb3 sample (top), 9.4T; pH 7.2; 298K. The 1H NMR chemical shifts of all l-lactate â–ª Yb3(blue) and d-lactateâ–ª Yb3(red) protons were assigned as shown by the colored labels. The protons of the excess non-chelated lactate are far upfield in their normal diamagnetic positions (not shown here)