Fig. 6. Effects of paramagnetic Cu(ii)–EDTA doping on (a) ¹H and (b) ¹⁷O spin–lattice relaxation times. All measurements were carried out at 14.1 T for the [2-¹⁷O]-d-glucose/NaCl/H₂O cocrystal with (closed symbols) and without (open symbols) added Cu–EDTA.