Lanthanide-loaded paramagnetic liposomes as switchable magnetically oriented nanovesicles.

Osmotically shrunken liposomes loaded with paramagnetic lanthanide(III) complexes orient in a static magnetic field according to the sign of their magnetic susceptibility anisotropy (Deltachi). The magnitude and sign of Deltachi are modulated by the magnetic properties of the Ln (III) ion, by the structural characteristics of the metal chelate, and by the stereochemical arrangement of the lipophilic substituents.