Alternatively, (6-{2-[2-(2-methoxy-ethoxy)-ethoxy]-ethoxy}-hexyl)phosphonic acid was used as a stabilizing ligand. In this case, the particles were dispersed in 5 mL of chloroform, and, instead of MEEAA, 1.2 mL of 0.5 M ligand solution in chloroform (0.197 g, 0.6 mmol) was added to the synthesized NPs and further purification was carried out in the same way as described above. The final yield was 44%.