Abstract
Interaction of a cyclometalated dinuclear Ir(III) complex with large and small unilamellar lipid vesicles (LUVs and SUVs) was studied in aqueous medium. This class of Ir(III) coordination complexes have potential biological implications and are frequently used as therapeutic agents and biomarkers. The complex emits due to triplet metal-to-ligand charge transfer (3MLCT) (dπIr→π*imidazolylphenanthroline). The weak emission of the complex, in aqueous medium, increases profusely on interaction with anionic lipid vesicles. Luminescence, however, gets quenched on application of cationic vesicles. The present study shows that charged lipid vesicles interact differently with the dinuclear Ir(III) complex and, in turn, affect its 3MLCT emission. The outcome of the present experiment spectroscopically describes the changes in photophysical aspects of the Ir(III) complex due to the application of the lipid vesicles in aqueous environment.
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