Trinuclear ruthenium clusters attached to Au nanoparticles can be partially reduced to form mixed-valence nanoclusters. The nanoparticles are synthesized using a modified Brust method. IR-SEC shows dynamic coalescence of the stretching vibrations of the carbonyls, ν(CO), indicating the electron transfer between Ru clusters attached via a π-conjugated bridge to NPs occurs on the picosecond timescale. Simulation of IR spectra gives ket on the order of 1011 s−1.
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