The invention relates to chelate compounds which can be used in MRI, the chelates being intended to be conveyed by lipophilic transporters, such as lipid nanoparticles or liposomes. The invention also relates to compounds comprising, in association, these chelates and these transporters, if appropriate connected via chemical bonding groups, and to their use in diagnostic imaging, it being possible for this association additionally to comprise biological targeting markers, denoted biovectors.
