Abstract
4,4′-Diphenyltetrathiafulvalene (DPTTF) capped gold nanoparticles of 3- to 5-nm diameter have been prepared and their thermal stability has been investigated by variable temperature FT–IR spectroscopy. The DPTTF molecules at the cluster surface undergo charge-transfer complexation with C60 to form Au/DPTTF.C60. Direct evidence of complexation is observed in the x-ray photoelectron and infrared spectra of the clusters. The orientational ordering transition of C60 in Au/DPTTF.C60 clusters occur at a higher temperature than pure C60 indicating increased resistance to orientational disorder due to charge transfer. Variable-temperature infrared spectroscopic studies yield complementary information. Both FT–IR and mass spectra show that some of the sites on the gold surface are occupied by the phase-transfer reagent used in the cluster preparation.
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