The silica nanoparticles (SNs) co-doped with paramagnetic ([Mn(HL)],) and luminescent ([Ru(dipy)]) complexes are represented. The specific distribution of [Mn(HL)] within the SNs allows to achieve about ten-fold enhancing in magnetic relaxivities in comparison with those of [Mn(HL)] in solutions. The leaching of [Mn(HL)] from the shell can be minimized through the co-doping of [Ru(dipy)] into the core of the SNs. The co-doped SNs exhibit colloid stability in aqueous solutions, including those modeling a blood serum. The surface of the co-doped SNs was also decorated by amino- and carboxy-groups. The cytotoxicity, hemoagglutination and hemolytic activities of the co-doped SNs are on the levels convenient for "in vivo" studies, although the amino-decorated SNs cause more noticeable agglutination and suppression of cell viability. The co-doped SNs being intravenously injected into mice allows to reveal their biodistribution in both ex vivo and in vivo conditions through confocal microscopy and magnetic resonance imaging correspondingly.
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