Povrchem modifikovaná luminiscence, povrchem zesílený Ramanův rozptyl a plasmonem katalyzovaná reaktivita Ru(II) dikarboxybipyridylových komplexů chemisorbovaných na Ag nanočástice

Žůrková, Markéta

[Ru(bpy)3]2+ (bpy = 2,2'-bipyridine) and its dicarboxybipyridine derivatives, namely [Ru(bpy)2(dcbpy)]2+ (dcbpy = 4,4'-dicarboxy-2,2'-bipyridine) and [Ru(dcbpy)3]2+ , were employed as model molecular ions for investigation of the mechanism of surface-modified luminiscence, of light-induced surface reactivity of adsorbates in systems with Ag nanoparticles (NPs), and as prospective photoexcited reductants of Ag+ ions capable of in- situ generation of Ag NPs. The steady state and the nanosecond time resolved luminescence (namely, 3 MLCT phosphorescence) of the [Ru(bpy)2(dcbpy)]2+ chemisorbed onto the non-aggregated Ag NPs has been investigated and compared to those of the electrostatically bonded [Ru(bpy)3]2+ . The intensity decrease of the emission and the excitation spectra observed for both complexes upon their attachment to Ag NPs has been attributed to the overlap of the excitation spectra with the surface plasmon extinction (SPE) of Ag NPs. This overlap enabled energy transfer from 3 MLCT excited state of the complexes to the excited surface plasmon state of Ag NPs. Additionally, it was proved that the chemisorption of the complexes manifests itself by at least one order of magnitude shorter 3 MLCT excited state lifetime than the electrostatic interaction. Furthermore, by the newly developed...

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