Fig. 6 Comparison of experimental hydrodynamic values (1–3) with the calculated hydrodynamic values for toroidal molecules (4): a characteristic translational diffusion coefficient (1, 1: in H2O, 2, 2′: in DMF, 3, 3′: in DMSO) b intrinsic viscosity (1, 1′: in DMF, 2, 2′: in DMSO) (1–3): The hydrodynamic values are plotted in function of the space-filling (or CPK) models radii r iCPK (average inner) and r 0CPK (outer) of the CD molecules (Table 1). (1′–3′): The hydrodynamic values are plotted in function of effective outer radii r 0eff (see text)