We report molecular functionalization of the promising manganite nanoparticles
La0.67Sr0.33MnO3 (LSMO) for their solubilization in aqueous environments. The
functionalization of individual NPs with the biocompatible citrate ligand, as confirmed by Fourier transform infrared
(FTIR) spectroscopy, reveals that citrates are covalently attached to the surface of the NPs. UV-VIS spectroscopic
studies on the citrate functionalized NPs reveals an optical band in the visible region. Uniform size selectivity (2.6
nm) of the functionalization process is confirmed from high resolution transmission electron microscope (HRTEM). In the
present study we have used the optical band of the functionalized NPs to monitor their interaction with other
biologically important ligands. Forster resonance energy transfer (FRET) of a covalently attached probe
4-nitrophenylanthranilate (NPA) with the capped NPs confirm the attachment of the NPA ligands to the surface functional
group (-OH) of the citrate ligand. The FRET of a DNA base mimic, 2-aminopurine (2AP), with the NPs confirms the surface
adsorption of 2AP. Our study may find relevance in the study of the interaction of individual manganite NPs with
drug/ligand molecules
