The results were confirmed by transmission electron microscopy ( Figure 3) . We can see that nanoparticles were formed and that their diameters are comparable with those measured by dynamic light scattering. It can be seen from the micrographs that neither Mono-M2e nor Tetra-M2e form nanoparticles with perfectly spherical morphology. This may in some way explain the polydispersity observed by dynamic light scattering.