title: Charge-Transfer Complexation of C(60) with Diphenyltetrathiafulvalene (DPTTF) Capped Gold Clusters.
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 C(60) to form Au/DPTTF.C(60). Direct evidence of complexation is observed in the x-ray photoelectron and infrared spectra of the clusters. The orientational ordering transition of C(60) in Au/DPTTF.C(60) clusters occur at a higher temperature than pure C(60) 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. Copyright 1999 Academic Press.
authors.affiliation: Department of Chemistry and Regional Sophisticated Instrumentation Centre, Indian Institute of Technology, Madras, 600 036, India
authors.initials: MR
authors.lastname: Resmi
authors.initials: N
authors.lastname: Sandhyarani
authors.initials: R
authors.lastname: Unnikrishnan
authors.initials: S
authors.lastname: Ma
authors.initials: T
authors.lastname: Pradeep